Electrical Circuit - MCQs Part VI - Answers

Below are the answers key for the Multiple Choice Questions in Electrical Circuit - MCQS Part VI

251. 70 V

252. Air

253. Anticapacitance switch

254. Bifilar resistor

255. Alloy

256. Peak

257. Increases two times

258. Decreases or increases

259. Maximum

260. Receives energy

261. Eliminating the j component in the denominator

262. Quadrature component only

263. 0

264. 5

265. 10

266. Increased

267. Distance between plates

268. Appliances have different current ratings

269. V/m

270. Triangular wave

271. Because frequency of dc is zero

272. Greater than the largest capacitor

273. Reactance

274. Voltage

275. ½ L and 2 A

276. Reactive power

277. 50 %

278. Exponential law

279. Current

280. 2 μF

281. Lagging

282. Less than the smallest resistance in the connection

283. Large self-induced voltage across L

284. Phasor

285. Mass

286. Electrolytic

287. Electronic system

288. Shorting the load terminals

289. R_L = r

290. 110 V

291. Smaller than the smallest capacitor

292. Thevenin’s theorem

293. Figure of merit

294. CV²/2

295. Norton’s theorem

296. Electrolytic

297. 30 W

298. Ohm’s law

299. Cryogenic conductor

300. Non-linear circuit

The Six-Parts Series

Following is the list of multiple choice questions in this brand new series:

Read More »

Electrical Circuit - MCQs Part VI

Multiple Choice Questions Topic Outline

• MCQs in AC-DC circuits
• MCQs in Resistors
• MCQs in Inductors
• MCQs in Capacitors

The Six-Parts Series

Following is the list of multiple choice questions in this brand new series:

Electrical circuits MCQs

PART 1: MCQs from Number 1 – 50                        Answer key: PART I

PART  2: MCQs from Number 51 – 100                   Answer key: PART II

PART 3: MCQs from Number 101 – 150                  Answer key: PART III

PART 4: MCQs from Number 151 – 200                  Answer key: PART IV

PART 5: MCQs from Number 201 – 250                  Answer key: PART V

PART 6: MCQs from Number 251 – 300                  Answer key: PART VI

Start with Part VI of the MCQs Series

251. A neon glow lamp used as a night light ionizes at approximately

• A. 70 V
• B. 80 V
• C. 90 V
• D. 100 V

252. What dielectric is generally employed by a variable capacitor?

• A. Mica
• B. Air
• C. Electrolyte
• D. Ceramic

253. A switch designed to have low capacitance between its terminal when open.

• A. LOCAP switch
• B. AntiLOCAP switch
• C. Anticapacitance switch
• D. Capacitance switch

254. A resistor wound with a wire doubled back on itself to reduce the inductance.

• A. Bifilar resistor
• B. Wire-wound resistor
• C. Anti-inductive resistor
• D. Bleeder resistor

255. What fusion of elements is without chemical action between them?

• A. Mixture
• B. Compound
• C. Alloy
• D. Ionization

256. In calculating maximum instantaneous power ___ voltage or current is used.

• A. Peak
• B. Average
• C. Rms
• D. Instantaneous

257. The area of capacitor plates increases two times, then its capacitance

• A. Increases two times
• B. Increases four times
• C. Decreases two times
• D. Decreases four times

258. If the inductance is decreased, the impedance of the circuit containing a resistor a capacitor and an inductor connected in series to an ac source

• A. Decreases
• B. Increases
• C. Decreases or increases
• D. Decreases, increases or remains the same

259. When the movable plates of a gang capacitor completely overlap the fixed plates, the capacitance of the capacitor is

• A. Halfway between maximum and minimum
• B. Maximum
• C. Minimum
• D. Zero

260. In a circuit, a passive element is one which

• A. Supplies energy
• B. Receives energy
• C. Both supplies and receives energy
• D. Attenuates signal

261. Rationalizing the denominator of a complex number means

• A. Eliminating the j component in the denominator
• B. Adding j component in the denominator
• C. Eliminating the j component in the numerator
• D. Adding j component in the numerator

262. When two complex conjugates are subtracted, the result is a

• A. Quadrature component only
• B. Complex component
• C. In-phase component
• D. Real component

263. A coil of inductance L has an inductive reactance of X_L in an ac circuit in which the effective current is I. The coil is made from a superconducting material. The rate at which power is dissipated in the coil is

• A. 0
• B. I²X_L
• C. IX_L
• D. IX_L²

264. If the capacitance of mica capacitor is 5 times the capacitance of air capacitor, then the relative permittivity of mica is

• A. 2.5
• B. 5
• C. 10
• D. 25

265. The hot resistance of an incandescent lamp is about ___ times its cold resistance.

• A. 10
• B. 5
• C. 50
• D. 100

266. When the temperature of copper wire is increased its resistance is

A. Increased

B. Decreased

C. Constant

D. Zero

267. A trimmer is a variable capacitor in which capacitance is varied by changing the

• A. Number of plates
• B. Dielectric
• C. Distance between plates
• D. Plate area

268. The reason why electrical appliances are not connected in series.

• A. Greater electrical power saving
• B. Power loss is minimum
• C. Appliances have different current ratings
• D. All of the above

269. Form its definition, the unit of electric field, is the N/C and equivalent unit of is the

• A. V(m)²
• B. V(m)
• C. V/m²
• D. V/m

170. Which of the following is the peakiest?

• A. Square wave
• B. Sinusoidal wave
• C. Triangular wave
• D. Rectangular wave

171. Why are inductance and capacitance not relevant in a dc circuit?

• A. Because it is a simple circuit
• B. Because dc circuits require only resistance as load
• C. Because they do not exist in a dc circuit
• D. Because frequency of dc is zero

172. When capacitors are connected in parallel, the total capacitance is

• A. Greater than the largest capacitor
• B. Smaller than the largest capacitor
• C. Smaller than the smallest capacitor
• D. Greater than the smallest capacitor

173. When current and voltage arte in phase in an ac circuit, the ___ is equal to zero.

• A. Resistance
• B. Reactance
• C. Inductance
• D. Capacitance

174. Thevenin’s theorem is what form of an equivalent circuit?

• A. Current
• B. Voltage
• C. Both current and voltage
• D. Neither current nor voltage

175. Which of the following combination of length and cross-sectional area will give a certain volume of copper the least resistance?

• A. 2L and1/2 A
• B. Does not matter because the volume of copper remains the same
• C. L and A
• D. ½ L and 2 A

176. The ratio between the reactive power and the apparent power of an ac load is called

• A. Quality factor
• B. Power factor
• C. Power ratio
• D. Reactive power

177. What is the efficiency under the conditions of maximum power transfer?

• A. 50 %
• B. 100 %
• C. 25 %
• D. 75 %

178. The charging of a capacitor through a resistance follows what law?

• A. Linear law
• B. Hyperbolic law
• C. Inverse-square law
• D. Exponential law

179. Norton’s theorem is what form of an ac equivalent circuit?

• A. Voltage
• B. Current
• C. Both voltage and current
• D. Neither voltage nor current

180. What is the total capacitance of 10 capacitors, each of 20 μF in series?

• A. 200 μF
• B. 2 μF
• C. 100 μF
• D. 0.5 μF

181. An inductive load always has a ___ power factor

• A. Leading
• B. Lagging
• C. Zero
• D. Unity

182. When resistance are connected in parallel, the total resistance is

• A. Less than the smallest resistance in the connection
• B. Greater than the smallest resistance in the connection
• C. Between the smallest and greatest resistance in the connection
• D. Increasing and decreasing depending upon the supply voltage

183. The arc across a switch when it open an RL circuit is a result of the

• A. Large self-induced voltage across L
• B. Long time constant
• C. Low resistance of the open switch
• D. Surge of resistance

184. What is a rotating vector whose projection can represent either current or voltage in an ac circuit?

• A. Polar diagram
• B. Scalar quantity
• C. Velocity
• D. Phasor

185. Which factor does not affect resistance?

• A. Length
• B. Resistivity
• C. Cross-sectional area
• D. Mass

186. Which of the following capacitors are used only in dc circuits?

• A. Mica
• B. Ceramic
• C. Mylar
• D. Electrolytic

187. The maximum power transfer theorem is used in

• A. Power system
• B. Electronic system
• C. Refrigeration
• D. Air conditioning

188. In Norton’s theorem, the short circuit current is obtained by

• A. Opening the load terminals
• B. Shorting the load terminals
• C. Opening the voltage source
• D. Shorting the voltage source

189. For maximum power transfer, what is the relation between load resistance R_L and internal resistance R of the voltage source?

• A. R_L = 2 r
• B. R_L = 1.5 r
• C. R_L = r
• D. R_L = 3 r

190. A capacitor of 0.5 μF charged to 220 V is connected across an uncharged 0.5 μF capacitor. What is the voltage across each capacitor?

• A. 220 V
• B. 150 V
• C. 110 V
• D. 22 V

191. When capacitors are connected in series, the total capacitance is

• A. Smaller than the smallest capacitor
• B. Smaller than the largest capacitor
• C. Greater than any of the capacitor
• D. Greater than the largest capacitor

192. What theorem is generally used in the analysis of vacuum tubes?

• A. Superposition theorem
• B. Millman’s theorem
• C. Thevenin’s theorem
• D. Norton’s theorem

193. Another term of the quality factor of the resonant circuit.

• A. Figure of merit
• B. Figure of demerit
• C. Noise factor
• D. Noise figure

194. Which of the following represents the energy stored in a capacitor?

• A. CV²/2
• B. 2Q²/C
• C. C²/V
• D. CV

195. What theorem is usually used in the analysis of transistor circuit?

• A. Superposition theorem
• B. Millman’s theorem
• C. Thevenin’s theorem
• D. Norton’s theorem

196. Which of the following capacitors has the highest cost per μF?

• A. Plastic
• B. Air
• C. Mica
• D. Electrolytic

197. Under the conditions of maximum power transfer, a voltage source is delivering a power of 15 W to the load. What is the power generated by the source?

• A. 60 W
• B. 30 W
• C. 15 W
• D. 4 W

198. Which of the following is neither a basic physical law nor deliverable from one?

• A. Ohm’s law
• B. Coulomb’s law
• C. Kirchhoff’s first law
• D. Kirchhoff’s second law

199. Another term for superconductor.

• A. Generic conductor
• B. Ultraconductor
• C. Cryotron
• D. Cryogenic conductor

300. A circuit whose parameters change with voltage or current.

• A. Non-linear circuit
• B. Linear circuit
• C. Complex circuit
• D. Passive circuit

NOTE:

For any Questions, Clarifications and any violent Reactions use the comment section below. I'll be much willing to assist you.

---

credit: ©2013 www.FroydWess.com

Read More »

Electrical Circuit - MCQs Part V - Answers

Below are the answers key for the Multiple Choice Questions in Electrical Circuit - MCQS Part V

201. Decreases two times

202. Power factor

203. Power absorbed is zero

204. 360

205. The voltage applied to the plate

206. To utilize electrical energy

207. Inductance

208. Edge effect

209. Increase by 4 C

210. Charge

211. Inversely proportional to

212. Resistance

213. It has reactance in radio-frequency circuits

214. Decreases

215. Frequency

216. Three-terminal

217. Tan θ

218. Depends on the factor 2 π

219. Skin effect

220. Zero

221. Ceramic

222. Temperature coefficient

223. By using multiplate construction

224. Do not change with voltage and current

225. Rms

226. One half

227. Parallel resonant circuit

228. Imaginary

229. Effects produced

230. A complex number

231. Carbon

232. Manganin

233. The current is zero in all the other resistances

234. The rate at which electrons pass a given point

235. 2.7 Ω to 22 MΩ

236. 22 Ω

237. Capacitive

238. The energy stored in the magnetic field of the coil is 10 times the energy wasted in its resistance

239. Equals its peak value

240. 0.577

241. Increased

242. 12 ms

243. Resistance

244. Air

245. Rectangular

246. Polar

247. R/Z

248. Directly proportional to

249. 9 capacitors will be in parallel

250. Ω²/V

The Six-Parts Series

Following is the list of multiple choice questions in this brand new series:

Read More »

Electrical Circuit - MCQs Part V

Multiple Choice Questions Topic Outline

• MCQs in AC-DC circuits
• MCQs in Resistors
• MCQs in Inductors
• MCQs in Capacitors

The Six-Parts Series

Following is the list of multiple choice questions in this brand new series:

Electrical circuits MCQs

PART 1: MCQs from Number 1 – 50                        Answer key: PART I

PART  2: MCQs from Number 51 – 100                   Answer key: PART II

PART 3: MCQs from Number 101 – 150                  Answer key: PART III

PART 4: MCQs from Number 151 – 200                  Answer key: PART IV

PART 5: MCQs from Number 201 – 250                  Answer key: PART V

PART 6: MCQs from Number 251 – 300                  Answer key: PART VI

Start with Part V of the MCQs Series

201. The distance between the capacitor plates increases two times, then its capacitance

• A. Increases two times
• B. Increases four times
• C. Decreases two times
• D. Decreases four times

202. The ratio between the active power and the apparent power of a load in an ac circuit is called

• A. Quality factor
• B. Power factor
• C. Power ratio
• D. Power reactive

203. When the power factor of a circuit is zero,

• A. Power absorbed is maximum
• B. Power absorbed is minimum
• C. Power absorbed is zero
• D. The impedance is minimum

204. How many degrees of phase represents one full cycle?

• A. 360
• B. 180
• C. 270
• D. 90

205. Which of the following does not generally affect the value of a capacitor?

• A. The dielectric material used
• B. The surface area of the plates
• C. The thickness of the dielectric
• D. The voltage applied to the plate

206. What is the purpose of a load in an electric circuit?

• A. To increase the circuit current
• B. To decrease the circuit current
• C. To utilize electrical energy
• D. To make the circuit complete

207. The power factor of a certain circuit in which the voltage lags behind the current is 80 %. To increase the power to 100 %, it is necessary to add ___ to the circuit.

• A. Inductance
• B. Capacitance
• C. Resistance
• D. Impedance

208. Refers to the outward-curving distortion of the lines of force near the edges of two parallel metal plates that form a capacitor.

• A. Skin effect
• B. Night effect
• C. Edge effect
• D. Hall effect

209. If voltage across the plates of 2 F capacitor is increased by 4 V, then charge on the plates will

• A. Decrease by 2 C
• B. Increase by 2 C
• C. Decrease by 4 C
• D. Increase by 4 C

210. What does a capacitor store?

• A. Voltage
• B. Charge
• C. Current
• D. Power

211. The mutual inductance between two coils is ___ the reluctance of magnetic path.

• A. Directly proportional to
• B. Inversely proportional to
• C. Independent to
• D. Equal to

212. The result of rust in electrical (wire) connection is

• A. Inductance
• B. Conductance
• C. Impedance
• D. Resistance

213. Which of the following is a disadvantage of a wire-wound resistor?

• A. It has reactance in radio-frequency circuits
• B. It cannot handle much power
• C. It draws a large amount of current
• D. It cannot handle high voltage

214. The resistance of an insulator ___ when its temperature is increased.

• A. Decreases
• B. Remains the same
• C. Increases
• D. Varies

215. The wavelength of an alternating waveform depends upon the ___ of the variation.

• A. Period
• B. Number
• C. Frequency
• D. Amplitude

216. Delta to wye or wye to delta transformation technique is applied to a ___ network.

• A. One-terminal
• B. Two-terminal
• C. Three-terminal
• D. Complex

217. For greater accuracy, the value of phase angle θ should be determined from

• A. Cos θ
• B. Tan θ
• C. Sin θ
• D. Sec θ

218. Inductive reactance applies only to sine waves because it

• A. Increases with lower frequencies
• B. Increases with lower inductance
• C. Depends on the factor 2 π
• D. Decreases with higher frequencies

219. What increases the resistance of wire at high frequencies?

• A. Temperature
• B. Voltage
• C. Skin effect
• D. Insulation

220. An inductor carries 2 A dc. If its inductance is 100 μH, then what is its inductive reactance?

• A. Zero
• B. 1.3 kΩ
• C. 628 Ω
• D. -628 Ω

221. Barium-strontium titanite dielectric material is also called

• A. Ceramic
• B. Polyster
• C. Electrolytic
• D. Bakelite

222. In the 5-band method of capacitor color coding, the first band indicates

• A. Temperature coefficient
• B. Tolerance
• C. 1^st digit
• D. Capacitance value

223. What is the most convenient way of achieving large capacitance?

• A. By using multiplate construction
• B. By using air as dielectric
• C. By decreasing distance between plates
• D. By using dielectric of low permittivity

224. A linear circuit is one whose parameters

• A. Change with change in voltage
• B. Change with change in current
• C. Do not change with voltage and current
• D. Change with change in voltage and current

225. For a linear circuit, ___ voltage or current is used to calculate average power.

• A. Rms
• B. Peak
• C. Average
• D. Instantaneous

226. When two coils of identical reactance are in parallel without mutual inductance, the reactance of the combination is ___ the reactance of each coil.

• A. One half
• B. Twice
• C. Four times
• D. One fourth

227. Which of the following is also known as anti-resonant circuit?

• A. Parallel resonant circuit
• B. Series resonant circuit
• C. Tuned circuit
• D. Tank circuit

228. In a complex number 5 + j 10, 10 is called ___ part.

• A. Imaginary
• B. Real
• C. Conjugate
• D. Integer

229. The presence of an electric current is made known by

• A. Electric shock
• B. Effects produced
• C. Magnetic shock
• D. Flashing

230. The reciprocal of a complex number is

• A. A complex number
• B. A real number
• C. An imaginary number
• D. A whole number

231. Which of the following has negative temperature coefficient?

• A. Carbon
• B. Nickel
• C. Brass
• D. Constantan

232. Which of the following is a common material used in wire-wound resistors?

• A. Manganin
• B. Carbon
• C. Bronze
• D. German silver wire

233. If one resistance in a series connection is open, then

• A. The current is zero in all the other resistances
• B. The current is maximum in all the other resistances
• C. The voltage is zero across the open resistance
• D. The voltage is infinite across the open resistance

234. What determines the magnitude of electric current?

• A. The rate at which electrons are produced
• B. The type of material used
• C. The current carrying capacity of the circuit
• D. The rate at which electrons pass a given point

235. For a carbon composition resistor, typical resistance values range from

• A. 2.7 Ω to 22 MΩ
• B. 1000 Ω to 10000 Ω
• C. 10 Ω to 10 MΩ
• D. 2.7 Ω to 2.7 GΩ

236. A lead conductor has a resistance of 25 Ω at 0 ˚C. Determine its resistance at -30 ˚C

• A. 22 Ω
• B. 24 Ω
• C. 12 Ω
• D. 11 Ω

237. An impedance given by 90 -45˚ is a/an ___ impedance.

• A. Inductive
• B. Conductive
• C. Resistive
• D. Capacitive

238. If a coil has a Q of 10, it means that

• A. The energy stored in the magnetic field of the coil is 10 times the energy wasted in its resistance
• B. The energy wasted in its resistance is 10 times the energy stored in the magnetic field of the coil
• C. It is a low Q coil
• D. It is a high Q coil

239. What is the rms value of a square wave?

• A. Equals its peak value
• B. Equals its peak-to-peak value
• C. Peak divided by square root of two
• D. Peak divided by pi

240. The rms value of a triangular or sawtooth waveform is ___ times its peak value.

• A. 0.577
• B. 0.500
• C. 0.25
• D. 0.707

241. In a multiple capacitor, the plate area is

• A. Increased
• B. The same
• C. Decreased
• D. Variable

242. What is the time constant for L of 240 mH in series with R of 20 Ω?

• A. 12 ms
• B. 4.8 s
• C. 83.3 s
• D. 12 s

243. In an ac circuit, the power dissipated as heat depends on

• A. Impedance
• B. Capacitive reactance
• C. Resistance
• D. Inductive reactance

244. Which of the following dielectric materials makes the lowest-capacitance capacitor?

• A. Paper
• B. Mica
• C. Air
• D. Electrolyte

245. In adding or subtracting phasor quantities, ___ form is the most convenient.

• A. Polar
• B. Rectangular
• C. Trigonometric
• D. Exponential

246. In dividing or multiplying phasor quantities, ___ form is used.

• A. Polar
• B. Rectangular
• C. Trigonometric
• D. Exponential

247. The power factor of a circuit is equal to

• A. RZ
• B. X_C/Z
• C. X_L/Z
• D. R/Z

248. The capacitance of a capacitor is ___ relative permittivity.

• A. Directly proportional to
• B. Inversely proportional to
• C. Equal to
• D. Inversely proportional to the square of

249. If a multiplate capacitor has 10 plates, each of area 10 cm², then

• A. 10 capacitors will be in parallel
• B. 10 capacitors will be in series
• C. 9 capacitors will be in parallel
• D. 9 capacitors will be in series

250. Of the equivalent combination of units, which one is not equal to watt?

• A. Ω²/V
• B. AV
• C. A²Ω
• D. J/s

NOTE:

For any Questions, Clarifications and any violent Reactions use the comment section below. I'll be much willing to assist you.

---

credit: ©2013 www.FroydWess.com

Read More »

Electrical Circuit - MCQs Part IV - Answers

Below are the answers key for the Multiple Choice Questions in Electrical Circuit - MCQS Part IV

151. 3.7 K

152. By an axis opposite the X_C axis

153. Inductive

154. Moving the coils apart

155. Exponential law

156. Current magnification factor

157. 55 Ω-cm

158. 0.05 x 10^-6 F

159. 25 μC

160. Sine waves

161. Twice

162. Electrolytes

163. Positive

164. Joules

165. Quadrupled

166. Negative

167. Breakdown voltage

168. Larger plate area and less distance between plates

169. 14.5 MHz

170. 0.577 times peak value

171. 3.6 Ω

172. Phasor quantity

173. Block dc current

174. Resistor

175. The second digit of the value

176. 47

177. The same value as a single resistor

178. 1/12

179. 19 kΩ; 2 %

180. Volts per meter

181. Number of plates less one(n – 1)

182. Conductors separated by a dielectric

183. 2.592 x 10⁵ C

184. Approaches zero

185. 0.0034

186. Passing a current proportional to the rate of change of voltage

187. Square wave

188. Electrolytic

189. 10 + j 5 Ω

190. Elastance

191. 4 Ω

192. Resonance curve

193. 0.125 μF

194. Reactance chart

195. Voltage

196. Voltage

197. Resistance and inductive reactance

198. Surge voltage

199. Provides more power

200. Paper

The Six-Parts Series

Following is the list of multiple choice questions in this brand new series:

Read More »

Electrical Circuit - MCQs Part IV

Multiple Choice Questions Topic Outline

• MCQs in AC-DC circuits
• MCQs in Resistors
• MCQs in Inductors
• MCQs in Capacitors

The Six-Parts Series

Following is the list of multiple choice questions in this brand new series:

Electrical circuits MCQs

PART 1: MCQs from Number 1 – 50                        Answer key: PART I

PART  2: MCQs from Number 51 – 100                   Answer key: PART II

PART 3: MCQs from Number 101 – 150                  Answer key: PART III

PART 4: MCQs from Number 151 – 200                  Answer key: PART IV

PART 5: MCQs from Number 201 – 250                  Answer key: PART V

PART 6: MCQs from Number 251 – 300                  Answer key: PART VI

Start with Part IV of the MCQs Series

151. Metal tin becomes superconductor at approximately

• A. 6 K
• B. 3.7 K
• C. 5 K
• D. 4.7 K

152. In a complex resistance-reactance plane, X_L is represented

• A. By an axis opposite the R axis
• B. By an axis perpendicular to the X_C axis
• C. By an axis opposite the X_C axis
• D. By an axis parallel to the R axis

153. When the net reactance in a series coil-capacitor circuit is zero at frequency f, the nature of its reactance of frequency 2f is

• A. Inductive
• B. Capacitive
• C. Resistive
• D. Infinite

154. Which of the following is a way of decreasing mutual inductance?

• A. Moving the coils closer
• B. Moving the coils apart
• C. Decreasing the number of turns of either coil
• D. Increasing the number of turns of either coil

155. The charging of a capacitor through a resistance obeys

• A. Exponential law
• B. Logarithmic law
• C. Linear law
• D. Square law

156. The Q-factor of a parallel resonant circuit is also known as

• A. Voltage magnification factor
• B. Current magnification factor
• C. Gain magnification factor
• D. Resonance magnification factor

157. What is the specific resistance of a pure silicon?

• A. 55 Ω-mm
• B. 55 Ω-m
• C. 55 Ω-cm
• D. 55 kΩ-m

158. A capacitance of 0.05 μF equals

• A. 0.05 x 10⁶ F
• B. 0.05 x 10^-6 F
• C. 0.05 x 10^-12 F
• D. 0.05 x 10¹² F

159. A 5 μF capacitor charge to 5V has a stored charge equal to

• A. 1 μc
• B. 5 μc
• C. 25 μC
• D. 200 μc

160. The factor 0.707 for converting peak to rms applies only to

• A. Square waves
• B. Triangle waves
• C. Sawtooth waves
• D. Sine waves

161. When two in-phase sine waves that have identical frequency and amplitude are added together, then the result is a sine wave with ___ the amplitude of either.

• A. Half
• B. Twice
• C. Four times
• D. One-fourth

162. Liquids that are good conductors because of ionization are called

• A. Electrolytic
• B. Bases
• C. Acid
• D. Electrolytes

163. Tungsten filament of bulbs has a hot resistance higher than its cold resistance due to its temperature coefficient which is

• A. Positive
• B. Negative
• C. Zero
• D. Infinite

164. A term used to express the amount of electrical energy stored in electrostatic field.

• A. Joules
• B. Coulombs
• C. Watts
• D. Electron-volt

165. With double the number of turns by the same length and area, the inductance is

• A. The same
• B. Doubled
• C. Quartered
• D. Quadrupled

166. The temperature coefficient of resistance of electrolytes is

• A. Negative
• B. Positive
• C. Zero
• D. Infinite

167. What refers to the lowest voltage across any insulator that can cause current flow?

• A. Conduction voltage
• B. Critical voltage
• C. Breakdown voltage
• D. Voltage capacity

168. Capacitance increase with

• A. Larger plate area and less distance between plates
• B. Larger plate area and greater distance between plates
• C. Smaller plate area and less distance between plates
• D. Higher values of applied voltage

169. What is the resonant frequency of a circuit when L of 3 microhenrys and C of 40 picofarads are in series?

• A. 14.5 kHz
• B. 145 MHz
• C. 14.5 MHz
• D. 145 kHz

170. For a triangular and sawtooth waveform the rms voltage or current equals

• A. 0.707 times peak value
• B. 0.577 times peak value
• C. 0.577 times average value
• D. 0.707 times rms value

171. If two resistances of 9 Ω and 6 Ω are connected in parallel, the total resistance is

• A. 54 Ω
• B. 0.3 Ω
• C. 15 Ω
• D. 3.6 Ω

172. Refers specifically to steady state values of quantities in ac circuits which are complex numbers.

• A. Domain
• B. Scalar quantity
• C. Vector quantity
• D. Phasor quantity

173. A capacitor is used to

• A. Block dc current
• B. Pass dc current
• C. Open voltage source
• D. Short the voltage source

174. The usual load of a dc circuit is a/an

• A. Resistor
• B. Capacitor
• C. Inductor
• D. Both inductor and capacitor

175. The second strip of an electronic resistor color-code represents

• A. The multiplier
• B. The second digit of the value
• C. The temperature
• D. The tolerance

176. Which of the following is a preferred resistor value?

• A. 520
• B. 47
• C. 43,000
• D. 54,321

177. A three-by-three, series-parallel matrix of resistors, all having the same ohmic value, would have a net resistance of

• A. One-third the value of a single resistor
• B. Three times the value of a single resistor
• C. The same value as a single resistor
• D. Nine times the value of a single resistor

178. In an ac wave, 30 degrees of phase is ___ of a cycle.

• A. ½
• B. 1/12
• C. 1/3
• D. 1/30

179. What is the value of a carbon composition resistor with the following color code: Brown, white, orange, red

• A. 190 Ω; 10 %
• B. 19 kΩ; 2 %
• C. 19 kΩ; 20 %
• D. 1.9 kΩ; 2 %

180. The electric field strength between capacitor plates has a unit of

• A. Volts per meter
• B. Volts per mil
• C. Amperes per meter
• D. Amperes per mil

181. For multi-plate capacitor, capacitance is proportional to

• A. Number of plates less one(n – 1)
• B. Number of plates plus one(n + 1)
• C. Number of plates less two(n - 2)
• D. Number of plates (n)

182. A capacitor consists of two

• A. Conductors only
• B. Dielectric only
• C. Conductors separated by a dielectric
• D. Dielectric separated by a conductor

183. How many coulombs are delivered by a storage battery in 25 hours if it is supplying current at the rate of 3 A?

• A. 2.592 x 10⁵ C
• B. 2.592 x 10³ C
• C. 2.592 x 10⁸ C
• D. 2.592 x 10¹² C

184. When frequency of an ac wave decreases, the value of X_L in a coil

• A. Approaches zero
• B. Gets larger positively
• C. Gets larger negatively
• D. Stays constant

185. The temperature-resistance coefficient of pure gold is

• A. 0.0034
• B. 0.0037
• C. 0.0038
• D. 0.0039

186. The capacitor opposes any change in voltage across it by

• A. Passing a voltage proportional to the rate of change of current
• B. Acting as a short circuit at time equal to zero
• C. Passing a current proportional to the rate of change of voltage
• D. Acting as a short circuit at time equal to infinity

187. What is the most common non-sinusoidal waveform?

• A. Square wave
• B. Triangular wave
• C. Trapezoidal wave
• D. Sawtooth wave

188. Which of the following capacitors is suitable for dc filter circuits?

• A. Mica
• B. Ceramic
• C. Paper
• D. Electrolytic

189. A series RL circuit has R of 10 Ω and X_L of 5 Ω, its impedance in rectangular form is given by

• A. 10 + j 5 Ω
• B. 10 + j 10 Ω
• C. 10 – j 5 Ω
• D. 10 – j 10 Ω

190. What is the reciprocal of capacitance?

• A. Reluctance
• B. Susceptance
• C. Elastance
• D. Conductance

191. If the output resistance of a voltage source is 4 Ω, it internal resistance should be

• A. 4 Ω
• B. 8 Ω
• C. 2 Ω
• D. Infinite

192. The curve between current and frequency is termed as

• A. Voltage curve
• B. Gain curve
• C. Power curve
• D. Resonance curve

193. What is the total effective capacitance of two 0.25 μF capacitors connected in series?

• A. 0.125 μF
• B. 1.25 μF
• C. 0.50 μF
• D. 2.5 if

194. What can be used to estimate resonant frequency and to find reactance at any frequency for any value of capacitor or inductor?

• A. Smith chart
• B. Reactance chart
• C. Impedance chart
• D. Resonance chart

195. For a parallel AC circuit, ___ is used as a reference phasor.

• A. Voltage
• B. Power
• C. Current
• D. Resistance

196. For a series AC circuit, ___ is not used as a reference phasor.

• A. Voltage
• B. Impedance
• C. Current
• D. Conductance

197. If a certain circuit has a current that is lagging the voltage by 45˚, then it displays

• A. Pure inductive reactance
• B. Resistance and capacitance reactance
• C. Resistance and inductive reactance
• D. Pure capacitive reactance

198. What maximum voltage can be applied across the capacitor for very short period of time?

• A. Working voltage
• B. Surge voltage
• C. Stray voltage
• D. Peak voltage

199. What is expected when two 20 kΩ, 1 watt resistor in parallel are use instead of one 10 kΩ, 1 watt?

• A. Provides higher current
• B. Provides less power
• C. Provides more power
• D. Provides wider tolerance

200. Which of the following materials has the lowest dielectric strength?

• A. Glass
• B. Paper
• C. Mica
• D. Teflon

NOTE:

For any Questions, Clarifications and any violent Reactions use the comment section below. I'll be much willing to assist you.

---

credit: ©2013 www.FroydWess.com

Read More »

Electrical Circuit - MCQs Part III - Answers

Below are the answers key for the Multiple Choice Questions in Electrical Circuit - MCQS Part III

101. Conductor

102. Current magnification factor

103. Voltage magnification factor

104. 1.16

105. 1.0

106. Barium-strontium titanite

107. Supplies energy

108. Both active and passive elements

109. 484 Ω

110. A circuit with neither a source of current nor a source of potential difference

111. Loop

112. Zero

113. 0.3 S

114. Volt-coulomb

115. 4 μF

116. Voltage

117. Twice as one

118. Peak factor

119. Equal to the charge of either capacitors

120. Acceptor circuit

121. Rejector circuit

122. Zero signal

123. In-phase

124. Reciprocity theorem

125. Charge

126. Infinite

127. The converse of

128. 400 kΩ

129. Electric current varies directly as the voltage and inversely as the resistance

130. Phasor

131. Half

132. Increase the power rating compared with one resistor alone

133. Phase

134. 1174 V

135. Manganin

136. Permittivity

137. Infinite

138. Number of plates

139. 50

140. It has a varying magnetic field

141. Lower resistance

142. Large internal resistance

143. One circular mil

144. Stores electrical energy

145. Thinness

146. The sum of individual charges

147. Square wave

148. Highest R has the highest V

149. The lowest R has the highest V

150. Variable resistor

The Six-Parts Series

Following is the list of multiple choice questions in this brand new series:

Read More »

Electrical Circuit - MCQs Part III

Multiple Choice Questions Topic Outline

• MCQs in AC-DC circuits
• MCQs in Resistors
• MCQs in Inductors
• MCQs in Capacitors

The Six-Parts Series

Following is the list of multiple choice questions in this brand new series:

Electrical circuits MCQs

PART 1: MCQs from Number 1 – 50                        Answer key: PART I

PART  2: MCQs from Number 51 – 100                   Answer key: PART II

PART 3: MCQs from Number 101 – 150                  Answer key: PART III

PART 4: MCQs from Number 151 – 200                  Answer key: PART IV

PART 5: MCQs from Number 201 – 250                  Answer key: PART V

PART 6: MCQs from Number 251 – 300                  Answer key: PART VI

Start with Part III of the MCQs Series

101. The potential gradient in a cable is maximum in

• A. Conductor
• B. Outer sheath
• C. Insulation
• D. Uniformly all over

102. The Q-factor of a parallel resonant circuit is also known as

• A. Current magnification factor
• B. Voltage magnification factor
• C. Load factor
• D. Leakage factor

103. The Q-factor of a series resonant circuit is also known as

• A. Current magnification factor
• B. Voltage magnification factor
• C. Load factor
• D. Leakage factor

104. What is the form factor of a triangular wave?

• A. 1.16
• B. 1.11
• C. 1.73
• D. 1.41

105. In a rectangular wave, the form factor is

• A. 1.11
• B. 1.16
• C. 1.0
• D. 1.73

106. Which of the following dielectric materials makes the highest-capacitance capacitor?

• A. Air
• B. Barium-strontium titanite
• C. Mica
• D. Electrolyte

107. In a circuit, an active element is one which

• A. Supplies energy
• B. Receives energy
• C. Both supplies and receives energy
• D. Amplifies signal

108. An electric circuit contains

• A. Passive elements
• B. Active elements
• C. Both active and passive elements
• D. Reactive elements

109. What is the hot resistance of a 100 W, 220 V incandescent lamp?

• A. 2.2 Ω
• B. 22 Ω
• C. 484 Ω
• D. 4.84 Ω

110. Which statement is true about a passive circuit?

• A. A circuit with neither a source of current nor a source of potential difference
• B. A circuit with a voltage source
• C. A circuit with a current source
• D. A circuit with only resistance as a load

111. What is a closed path made of several branches of the network called?

• A. Junction
• B. Node
• C. Terminal
• D. Loop

112. The internal resistance of an ideal voltage source is

• A. Infinite
• B. Equal to the load resistance
• C. Zero
• D. To be determined

113. What is the conductance of a circuit having three 10 Ω resistors in parallel?

• A. 0.3 S
• B. 3.33 S
• C. 0.33 S
• D. 30 S

114. Electric energy refers to

• A. Volt divided by coulomb
• B. Volt-ampere
• C. Volt-coulomb
• D. Watt divided by time

115. A capacitor requires 12 μC of charge to raise its potential of 3 V. What is the capacitance of the capacitor?

• A. 36 μF
• B. 15 μF
• C. 0.25 μF
• D. 4 μF

116. A capacitor opposes change in

• A. Voltage
• B. Current
• C. Voltage and current
• D. Neither voltage nor current

117. What is the total resistance of a two equal valued resistors in series?

• A. The difference of both
• B. The product of both
• C. Twice as one
• D. The sum of their reciprocals

118. The ratio of maximum value to the effective value of an alternating quantity is called

• A. Form factor
• B. Peak factor
• C. Dynamic factor
• D. Leakage factor

119. For series capacitors, total charge is

• A. The sum of individual charges
• B. Equal to the charge of either capacitors
• C. Equal to the product of the charges
• D. The quotient of the charges

120. Series resonant circuit is sometimes known as

• A. Rejector circuit
• B. Acceptor circuit
• C. Inductive circuit
• D. Capacitive circuit

121. Parallel resonant circuit is sometimes called as

• A. Acceptor circuit
• B. Rejector circuit
• C. Inductive circuit
• D. Capacitive circuit

122. When two pure sine waves of the same frequency and the same amplitude which are exactly 180˚ out-of-phase are added together, the result is

• A. A wave with twice the amplitude
• B. A wave with half the amplitude
• C. Zero signal
• D. A wave with twice the frequency

123. If two complex conjugates are added, ___ components results.

• A. In-phase
• B. Quadrature
• C. Complex
• D. Out-of-phase

124. If an emf in circuit A produces a current in circuit B, then the same emf in circuit B produces the same current in circuit A. this theorem is known as

• A. Maximum power transfer theorem
• B. Millman’s theorem
• C. Reciprocity theorem
• D. Norton’s theorem

125. According to Gauss theorem, flux can be equated to

• A. Charge
• B. Field intensity
• C. Current
• D. Voltage

126. An open resistor when checked with an ohmmeter reads

• A. Zero
• B. Infinite
• C. High but within the tolerance
• D. Low but not zero

127. Norton’s theorem is ____ Thevenin’s theorem.

• A. The same as
• B. The converse of
• C. Older that
• D. More accurate than

128. What value of R is needed with a 0.05 μF C for an RC time constant of 0.02 s?

• A. 400 Ω
• B. 400 MΩ
• C. 400 GΩ
• D. 400 kΩ

129. Which of the following is the statement of Ohm’s law?

• A. Electric current is directly proportional to both voltage and resistance
• B. Electric current varies directly as the voltage and inversely as the resistance
• C. Electrical power is directly proportional to the resistance and inversely as the current squared
• D. Electrical power is directly proportional to both voltage squared and the resistance

130. The admittance of a parallel RLC circuit is found to be the ___ sum of conductance and susceptances.

• A. Algebraic
• B. Arithmetic
• C. Vector
• D. Phasor

131. A wire of one kilometer length has a resistance of 20 Ω. If the length is halved, then the new resistance is ___ the original resistance.

• A. Half
• B. Twice
• C. One-fourth
• D. Three times

132. A series-parallel combination of identical resistors will

• A. Increase the power rating compared with one resistor alone
• B. Increase the voltage rating compared with one resistor alone
• C. Reduce the voltage rating compared with resistor alone
• D. Result in an expensive circuit

133. The ___ of an alternating quantity is defined as the fractional part of a period or cycle through which the quantity has advanced from selected origin.

• A. Phase
• B. Frequency
• C. Amplitude
• D. Waveform

134. An inductive circuit of resistance 16.5 Ω and inductance of 0.14 H takes a current of 25 A. if the frequency is 50 Hz, find the supply voltage.

• A. 1501 V
• B. 1174 V
• C. 1877 V
• D. 991 V

135. Which of the following has a positive temperature coefficient?

• A. Mica
• B. Manganin
• C. Silicon
• D. Carbon

136. The ratio of the flux density to the electric field intensity in the dielectric is called

• A. Permittivity
• B. Field intensity
• C. Permeability
• D. Elasticity

137. It is impossible to change the voltage across a capacitor instantly, as this would produce ___ current.

• A. Infinite
• B. Zero
• C. Low
• D. High

138. Which of the following is not a factor affecting capacitance of a basic capacitor?

• A. Area of plates
• B. Number of plates
• C. Distance between plates
• D. Dielectric material used

139. When voltage is applied across a ceramic dielectric the electrostatic field produced is 50 times greater than air dielectric. The dielectric constant of ceramic therefore is

• A. 50
• B. 100
• C. 16.67
• D. 5

140. The reason why alternating current can induce voltage is

• A. It has high peak value
• B. It has a stronger magnetic field than direct current
• C. It has a constant magnetic field
• D. It has a varying magnetic field

141. When two unequal values of resistors are connected in parallel across a dc source, greater current flows through the

• A. Higher resistance
• B. Lower resistance
• C. Higher wattage resistance
• D. Lower wattage resistance

142. A real current source has

• A. Infinite internal resistance
• B. Zero internal resistance
• C. Large internal resistance
• D. Small internal resistance

143. What is the cross-sectional are of a conductor whose diameter is 0.001 inch?

• A. One micron
• B. One angstrom
• C. One steradian
• D. One circular mil

144. Which of the following describes the action of a capacitor?

• A. Stores electrical energy
• B. Opposes changes in current flow
• C. Creates a dc resistance
• D. Converts ac to dc

145. High resistance values are a consequence of the ___ of the film.

• A. Thickness
• B. Length
• C. Thinness
• D. Area

146. For parallel capacitors, total charge is

• A. The sum of individual charges
• B. Equal to the charge of either capacitors
• C. Equal to the product of the charges
• D. The quotient of the charges

147. Which waveform in which the rms value and the mean value are equal?

• A. Square wave
• B. Triangular wave
• C. Sine wave
• D. Sawtooth

148. In a series circuit with unequal resistances the

• A. Highest R has the highest V
• B. Lowest R has the highest V
• C. Lowest R has the highest I
• D. Highest R has the highest I

149. In a parallel bank with unequal branch resistances

• A. The highest R has the highest I
• B. The lowest R has the highest V
• C. The lowest R has the highest V
• D. The highest R has the highest V

150. A rheostat is a form of

• A. Variable resistor
• B. Variable capacitor
• C. Potentiometer
• D. Thermocouple

NOTE:

For any Questions, Clarifications and any violent Reactions use the comment section below. I'll be much willing to assist you.

---

credit: ©2013 www.FroydWess.com

Read More »

Electrical Circuit - MCQs Part II - Answers

Below are the answers key for the Multiple Choice Questions in Electrical Circuit - MCQS Part II

51. All of the above

52. All of the above

53. Magnetic conductivity

54. Reactance

55. Either Clockwise or Counter-clockwise (arbitrarily selected)

56. Fleming’s right hand rule

57. This makes the operation of appliances independent with each other

58. Mass

59. Temperature

60. 1.25

61. 900 kΩ

62. Waveform

63. Sinusoidal

64. Volt-ampere

65. 10.1 MHz

66. Zero

67. 6 pF

68. Only capacitance

69. Plates

70. Current

71. The narrower the passband

72. Compensation theorem

73. Infinite

74. 33.3 pF

75. 0.001 H

76. Two conductors separated by a dielectric

77. Near the final maximum value of current

78. Differ only in the algebraic sign of their quadratic components

79. Resistive branch current is 90° out of phase with the inductive branch current

80. Voltage across R lags the voltage across X_L by 90°

81. Internal heating

82. Series resonance

83. Daraf

84. CV­²

85. Capacitor

86. 1.4142

87. Mass

88. Number of voltage sources

89. Cryogenics

90. Temperature coefficient of resistance

91. Manganin

92. CR law

93. Equal

94. 1.0

95. Current lags voltage by less than 90˚

96. Current leads voltage by 90˚

97. Increase with decreasing temperature

98. Voltage source is a passive element

99. Ideal voltage source

100. 300 + j 0 Ω

The Six-Parts Series

Following is the list of multiple choice questions in this brand new series:

Read More »

Electrical Circuit - MCQs Part II

Multiple Choice Questions Topic Outline

• MCQs in AC-DC circuits
• MCQs in Resistors
• MCQs in Inductors
• MCQs in Capacitors

The Six-Parts Series

Following is the list of multiple choice questions in this brand new series:

Electrical circuits MCQs

PART 1: MCQs from Number 1 – 50                        Answer key: PART I

PART  2: MCQs from Number 51 – 100                   Answer key: PART II

PART 3: MCQs from Number 101 – 150                  Answer key: PART III

PART 4: MCQs from Number 151 – 200                  Answer key: PART IV

PART 5: MCQs from Number 201 – 250                  Answer key: PART V

PART 6: MCQs from Number 251 – 300                  Answer key: PART VI

Start with Part II of the MCQs Series

51. Effects of capacitance

• A. It opposes any change in the amount of voltage
• B. Voltage is lagged behind the current by a quarter cycle
• C. Electric energy is stored in the capacitor in the form of electrostatic field
• D. All of the above

52. Points to be considered in choosing a capacitor

• A. Working voltage
• B. Type of dielectric
• C. Capacitance
• D. All of the above

53. Permeability is otherwise known as

• A. Magnetic conductivity
• B. Magnetic susceptibility
• C. Electric conductivity
• D. Electric susceptibility

54. The impedance in the study of electronics is represented by resistance and

• A. Inductance
• B. Capacitance
• C. Inductance and capacitance
• D. Reactance

55. Loop currents should be assumed to flow in which direction

• A. Straight
• B. Clockwise
• C. Counter-clockwise
• D. Either B or C arbitrarily selected

56. What determines the direction of induced emf in a conductor or coil?

• A. Cork screw rule
• B. Fleming’s left hand rule
• C. Ampere’s circuital law
• D. Fleming’s right hand rule

57. The reason why electrical appliances are connected in parallel.

• A. It is a simple circuit
• B. This makes the operation of appliances independent with each other
• C. This results in reduced power consumption
• D. All of the above

58. Which of the following does not affect resistance?

• A. Resistivity
• B. Cross-sectional area
• C. Mass
• D. Length

59. Which of the following is not considered a physical factor affecting resistance?

• A. Length
• B. Material type
• C. Temperature
• D. Cross-sectional

60. A 0.09 microfarad capacitor is charged to 220 volts. How long in milliseconds will it discharged resistor has a resistance of 20,000 ohms?

• A. 1.5
• B. 2.5
• C. 1.25
• D. 0.5

61. A trigger circuit consisting of a capacitor of 0.01 μF is connected in series with a resistor. If the circuit requires 100 V_dc to operate, determine the value of the resistor when time constant is 0.009s.

• A. 900 Ω
• B. 900 kΩ
• C. 900 MΩ
• D. 900 GΩ

62. The graph between an alternating quantity and time is called

• A. Sine wave
• B. Curve
• C. Waveform
• D. A plot

63. Which of the following is the most popular waveform?

• A. Sinusoidal
• B. Square wave
• C. Triangular
• D. Sawtooth

64. Which of the following does not refer to electrical energy?

• A. Volt-ampere
• B. Joule
• C. Watt-second
• D. Volt-coulomb

65. What is the resonant frequency of a circuit when L of 25 microhenrys and C of 10 picofarads are in parallel?

• A. 10.1 kHz
• B. 10.1 MHz
• C. 101 MHz
• D. 101 kHz

66. And ideal current source has an internal conductance of _____ siemen(s)

• A. Infinite
• B. One
• C. Zero
• D. One million

67. A capacitance of 6 µµF means

• A. 6 pF
• B. 6 nF
• C. 6 fF
• D. 6 aF

68. The voltage cannot be exactly in phase with the current in a circuit that contains

• A. Only capacitance
• B. Only resistance
• C. Inductance and capacitance
• D. Inductance, capacitance and resistance

69. The charge in the capacitor is stored at the

• A. Terminals
• B. Plates
• C. Dielectric
• D. Air

70. The reactance curve is a plot of frequency versus _____ for a series RLC circuit

• A. Current
• B. Voltage
• C. Gain
• D. Impedance

71. For a series circuit, the higher the quality factor

• A. The greater the bandwidth
• B. The narrower the passband
• C. The broader the resonance curve
• D. The wider the passband

72. “Any resistance R in a branch of a network in which a current I is flowing can be replaced by a voltage equal to IR”. This states

• A. Compensation theorem
• B. Reciprocity theorem
• C. Millman’s theorem
• D. Superposition theorem

73. The internal resistance of an ideal current source is

• A. Infinite
• B. Zero
• C. Equal to the load resistance
• D. To be determined

74. If three 100-pF capacitors are connected in series, then the total capacitance is

• A. 300 pF
• B. 100 pF
• C. 50 pF
• D. 33.3 pF

75. An inductance of 1 mH is

• A. 0.001 H
• B. 0.01 H
• C. 0.0001 H
• D. 0.10 H

76. A capacitor is basically constructed of

• A. Two conductors separated by a dielectric
• B. Two dielectric separated by a conductor
• C. Conductors and dielectric
• D. Conductors and semiconductors

77. In an inductive coil, the rate of rise of current is maximum

• A. Near the final maximum value of current
• B. At mid-value of current
• C. At half-power points
• D. After one time constant

78. Two complex numbers or phasors are said to be conjugate if they

• A. Differ only in the algebraic sign of their quadratic components
• B. Differ only in the algebraic sign of their real components
• C. Are equal in their real and quadrature components including algebraic signs
• D. Are equal in their real components but differ in their quadrature components including algebraic signs.

79. In an ac circuit with a resistive branch and an inductive branch in parallel, the

• A. Voltage across the inductance leads the voltage across the resistance by 90°
• B. Resistive branch current is 90° out of phase with the inductive branch current
• C. Resistive and inductive branch currents have the same phase
• D. Resistive and inductive branch currents are 180° out-of-phase

80. In an ac circuit with X_L and R in series, the

• A. Voltages across R and X_L are in phase
• B. Voltage across R lags the voltage across X_L by 90°
• C. Voltages across R and X_L are 180° out-of-phase
• D. Voltage across R leads the voltage across X_L by 90°

81. Leakage resistance in a capacitor results into

• A. Internal heating
• B. Internal bleeding
• C. Shorter useful life
• D. Short-circuiting

82. Voltage resonance means

• A. Series resonance
• B. Parallel resonance
• C. Current magnification
• D. Gain magnification

83. The unit of elastance is

• A. Farad
• B. Daraf
• C. Siemen
• D. Henry

84. The farad is not equivalent to which of the following combination of units

• A. CV­²
• B. C²/J
• C. C/V
• D. J/V²

85. Which component opposes voltage change?

• A. Resistor
• B. Inductor
• C. Capacitor
• D. Transistor

86. What is the peak factor for alternating current or voltage varying sinusiodally?

• A. 1.4142
• B. 0.707
• C. 0.636
• D. 1.11

87. Which of the following is not a factor affecting dielectric strength?

• A. Mass
• B. Moisture content
• C. Temperature
• D. Thickness

88. The superposition theorem is used when the circuit contains

• A. Reactive elements
• B. Active elements
• C. Number of voltage sources
• D. Single voltage source

89. What refers to such work at very low temperatures, near absolute zero?

• A. Cryogenics
• B. Superconductivity
• C. Subsonic
• D. Thermionic

90. A factor that states how much the resistance changes for a change in temperature?

• A. Resistivity
• B. Specific resistance
• C. Coefficient of temperature change
• D. Temperature coefficient of resistance

91. An alloy composed of 84 % copper, 12 % manganese and 4 % nickel.

• A. Manganin
• B. Constantan
• C. Nichrome
• D. German silver wire

92. A law which states that when a constant electromotive force is applied to a circuit consisting of a resistor and capacitor connected in series, the time taken for the potential on the plates of the capacitor to rise to any given fraction of its final value depends only on the product of capacitance and resistance.

• A. Child’s law
• B. CR law
• C. Coulomb’s law
• D. Debye T³ law

93. At parallel resonance, the currents flowing through L and C are

• A. Infinite
• B. Zero
• C. Unequal
• D. Equal

94. In a rectangular wave, the peak factor is

• A. 1.16
• B. 1.73
• C. 1.11
• D. 1.0

95. In an RL series circuit,

• A. Current lags voltage by less than 90˚
• B. Current lags voltage by 180˚
• C. Current lags voltage by 90˚
• D. Current leads voltage by 90˚

96. In a pure capacitance,

• A. Current leads voltage by 90˚
• B. Current leads voltage by 180˚
• C. Current lags voltage by 90˚
• D. Current lags voltage by 180˚

97. The ohmic value of a resistor with negative temperature coefficient

• A. Increases with increasing temperature
• B. Increase with decreasing temperature
• C. Stays unchanged with temperature change
• D. Stays unaffected even with increasing temperature

98. Which of the statements below is not true?

• A. Current source is an active element
• B. Resistor is a linear element
• C. Voltage source is a passive element
• D. Diode is a non-linear element

99. Which of the following elements is active?

• A. Resistor
• B. Inductor
• C. Capacitor
• D. Ideal voltage source

100. What is the complex impedance of a circuit with an absolute resistance of 300 Ω?

• A. 0 + j 300 Ω
• B. 300 + j 90 Ω
• C. 0 – j 300 Ω
• D. 300 + j 0 Ω

NOTE:

For any Questions, Clarifications and any violent Reactions use the comment section below. I'll be much willing to assist you.

---

credit: ©2013 www.FroydWess.com

Read More »