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

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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

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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

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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

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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

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Electrical Circuit - MCQs Part I - Answers

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

1. Positive to negative

2. Negative to positive

3. Both A and C

4. Quality factor

5. Power factor

6. Dissipation factor

7. Free electrons

8. The value of the impedance is minimum

9. 7.12 kHz

10. Resistance

11. Specific inductance capacity

12. The current lags V_L by 90˚

13. Carbon-composition resistor

14. Bisects

15. Z = jX_L

16. 0.707

17. Plate area

18. Current through the inductance lags its induced voltage by 90˚

19. 3 mH

20. 55 Ω-cm

21. 6 μF

22. Both X_L and X_C change as frequency changes

23. Either Leading or Lagging

24. DC as well as AC circuits

25. Parallel LC circuit

26. Leading

27. Almost zero

28. The separation of the half-power points

29. Increasing capacitance

30. 30 V

31. 200 V

32. Bandwidth is 200 Hz

33. A series resonant circuit is inductive if it operates at a frequency higher than the resonant frequency

34. Effective value

35. 32 V

36. Faradic current

37. The nature of material and temperature

38. 503 kHz

39. Four times

40. Purely capacitive circuit

41. 16.5 kHz

42. Fuse

43. 5

44. Wattage

45. Infinite resistance and zero inductance

46. Zero

47. Stray

48. 0.500

49. 40 μH

50. 1.73

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Electricity and Magnetism Fundamentals - MCQs Part VI - Answers

Below are the answers key for the Multiple Choice Questions in Electricity and Magnetism Fundamentals - MCQS Part VI

251. 1/μ₀ε₀ = c²

252. 1 and 10

253. +1 C

254. 90 ^o

255. volts/meter

256. vector

257. increases

258. 4 N/C

259. vector

260. D/E

261. the force

262. 8 C

263. 5 V

264. scalar

265. 7 V

266. 25 joules

267. Breakdown voltage

268. Glass

269. Mica

270. Porcelain

271. 1 coulomb/volt

272. hardened steel

273. Soft iron

274. The magnetic flux can be changed.

275. earphones

276. motors

277. directly proportional to

278. increases four times

279. inversely proportional to

280. 63000 N

281. 10⁸

282. Tesla

283. 2 Wb/m²

284. vector

285. 5 N/Wb

286. 4π × 10^-2 H/m

287. Permalloy

288. 50 × 10^-6

289. increases

290. 500 × 10³ N/Wb

291. diamagnetic

292. paramagnetic

293. Air

294. Oxygen

295. paramagnetic

296. ferromagnetic

297. 0.1 Wb/m²

298. magnetic force

299. Fleming’s left hand rule

300. 90^o

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Electricity and Magnetism Fundamentals - MCQs Part V - Answers

Below are the answers key for the Multiple Choice Questions in Electricity and Magnetism Fundamentals - MCQS Part V

201. narrow

202. Permanent Magnets

203. 60

204. Unlimited

205. lagging B behind H

206. Electric potential

207. Element

208. 40% ; 60%

209. about 1837 times

210. 8

211. valence

212. a conductor

213. an insulator

214. a semiconductor

215. a metal

216. 624 × 10¹⁶

217. 8.5 × 10²²

218. free

219. causes free electrons to flow

220. inversely proportional to

221. remains the same

222. 15 ohms

223. Ohm-m

224. increases

225. Siemens

226. 1.6 × 10^-8 Ω-m

227. Siemens/m

228. positive

229. negative

230. nature and temperature

231. decreases

232. negative

233. almost zero

234. 1/252 per ^oC

235. 1/250 per ^oC

236. 1/180 per ^oC

237. Silicon carbide

238. Kilowatt-hour

239. 5

240. 10 times

241. neutral

242. deficit of electrons

243. excess of electrons

244. protons and electrons

245. 8.854 × 10^-12 F/m

246. 1

247. 9 × 10⁹ N

248. 8.854 × 10^-11 F/m

249. decreases

250. Dielectric constant

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Electricity and Magnetism Fundamentals - MCQs Part IV - Answers

Below are the answers key for the Multiple Choice Questions in Electricity and Magnetism Fundamentals - MCQS Part IV

151. By moving the coils apart

152. The force set up when current flows through a conductor

153. Linear

154. In the direction determined by the left hand rule

155. Amount of current

156. Voltage opposing the applied emf

157. Oppose the change

158. 0.5 Tesla of flux density

159. 1000 A.t

160. 6366 A.t/Wb

161. 3.78 x 10^-4

162. 0.252 T

163. 167 turns

164. 300

165. The number of protons

166. Crystalline solid

167. Emf

168. Amorphous

169. Non- crystalline

170. Pauli exclusion principle

171. Ionic

172. permit mechanical clearance

173. Covalent

174. Because air has the lowest relative permeability

175. Metallic

176. directly proportional to

177. Van der Waals bond

178. Atomic packing factor (APF)

179. Madelung constant

180. creepage

181. φ_i/ φ_g

182. Curie’s Law

183. inversely proportional to

184. Curie-Weiss Law

185. Ewing’s theory of ferromagnetism

186. length ÷ area

187. Ampere’s theorem

188. 1.15 to 1.25

189. Astrionics

190. Flux density in the circuit

191. Aurora

192. air

193. Bridgman effect

194. soft iron

195. 400 V

196. At/Wb

197. 1.257 mWb/m²

198. Using material narrow hysteresis loop

199. hysteresis loss

200. silicon steel

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Electricity and Magnetism Fundamentals - MCQs Part III - Answers

Below are the answers key for the Multiple Choice Questions in Electricity and Magnetism Fundamentals - MCQS Part III

101. 34

102. Metallic bond

103. Permalloy

104. Hipernik

105. Alnico

106. Shielding

107. Motor action

108. Flux times number of turns

109. Magnetic field intensity

110. Field

111. Weber

112. At/Wb

113. Weber

114. Ampere - turn

115. Gilbert

116. Maxwell

117. Tesla

118. electron-volt

119. 1.26

120. 2000

121. 2 x 10^-5

122. 1

123. 1.6 x 10^-19

124. Energy

125. All of these

126. Valence electrons

127. Conductor

128. 1

129. Semiconductor

130. Electron

131. Ion

132. Lagging effect

133. Diamagnetic

134. Ferromagnetic

135. Thermionic emission

136. amber

137. Plasma

138. Exclusion principle

139. Potential energy

140. The current carriers in conductors are valence electrons

141. 8

142. Reduced to zero

143. Vector quantity

144. High permeability

145. Oxygen

146. Very much greater than permeability of air

147. Magnetizing force

148. directly proportional to

149. Directly proportional to the square of

150. Radio frequency

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Electricity and Magnetism Fundamentals - MCQs Part II - Answers

Below are the answers key for the Multiple Choice Questions in Electricity and Magnetism Fundamentals - MCQS Part II

51. Relative permeability

52. Conductance

53. Retentivity

54. Residual magnetism

55. Coercivity

56. Leakage factor

57. Flux density

58. Intensity magnetization

59. Magnetic field intensity

60. Magnetic susceptibility

61. Hysteresis

62. Flux

63. Ferrites

64. Air gap

65. Permanent magnets

66. Terrestrial magnetism

67. Keeper

68. moving electric charge

69. Stationary electric charges

70. is uniform

71. Greatly increased

72. a current- carrying wire loop

73. Becomes weaker

74. a stationary electric charge

75. North

76. Diameter of the wire

77. Zero

78. 1/2

79. The shape of the loop

80. Low permeability

81. Slightly equal to one

82. Domain

83. Inversely proportional

84. The conductivity of the material for magnetic lines of force

85. Toroid

86. Curie temperature

87. Hall effect

88. Edison effect

89. Wiegand effect

90. Hall effect

91. Walt effect

92. Atom

93. Atoms

94. Hydrogen

95. Electron

96. Neutrons

97. 1.1 x 10^-8

98. 2

99. 32, 32

50. 40

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Electricity and Magnetism Fundamentals - MCQs Part I - Answers

Below are the answers key for the Multiple Choice Questions in Electricity and Magnetism Fundamentals - MCQS Part I

1. About 10^-10 m

2. Faraday’s second law of electromagnetic induction

3. Coulomb’s second law

4. Law of conservation of charge

5. Magnetic pole

6. Self induced emf

7. Helix rule

8. Magnetism

9. Child’s law

10. James Clerk Maxwell

11. Magnetic field

12. Wiedemann Franz law

13. Paramagnetic

14. Hans Christian Oersted

15. Ferromagnetic

16. End Rule

17. Magnetic axis

18. Hans Christian Oersted

19. Unit pole

20. Reluctivity

21. Soft magnetic materials

22. Magnetomotive force

23. Ampere’s circuital law

24. Magnetic induction

25. Mmf

26. Andre Ampere

27. Always opposes the cause producing it

28. Faraday’s first law of electromagnetic induction

29. Diamagnetic

30. Reluctance

31. Kamerlingh Onnes

32. Magnet

33. Magnetic pole

34. Energy

35. Magnetic circuit

36. Michael Faraday

37. Michael Faraday

38. Faraday’s law

39. Lenz’ law

40. Right hand rule

41. Cork screw rule

42. Electromagnetic induction

43. Mutually induced emf

44. Statically induced emf

45. Lodestone

46. Electromagnetism

47. Magnetic flux

48. Flux

49. Permeance

50. Permeability

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Answers key: Gibilisco - CHAPTER 1 MCQs

Explanations for the Answers in Chapter 1: Basic Physical Concept Quiz

• 1. An electrically neutral atom has no net electric charge, so the number of positively charged particles (protons) must equal the number of negatively charged particles (electrons). The correct answer is (c).
• 2. This question contains a distraction! The correct answer is (a). By definition, the atomic number of any atom, whether neutral or not, equals the number of protons in its nucleus.
• 3. Once again, I've inserted a distraction. The correct answer is (d). That's how we define atomic weight for any atom, electrically neutral or otherwise.
• 4. When an atom has an electric charge, we call it an ion. By definition, a positive ion is a cation. The correct answer is (b).
• 5. A carbon atom always has six protons, so we can rule out (c) and (d) straightaway. In the chapter text, we identify two different isotopes of carbon. One isotope (C12) has six neutrons, and the other (C14) has eight neutrons. The correct answer is (a).
• 6. The correct answer is (c), because we define a two-atom molecule as diatomic. Some molecules, such as O₂, have two atoms, so we can rule out (a). Molecules can have electric charge because they, like atoms, can have an excess or deficiency of electrons, so we can rule out (b). The number of protons in a molecule need not equal the number of neutrons (and often doesn't), so we can rule out (d).
• 7. A compound always contains two or more atoms. A monatomic element has single atoms (meaning that none of its atoms are bound to any other atoms) by definition, so we'll never encounter a monatomic compound. The correct answer is (a).
• 8. When a substance becomes ionized, its atoms acquire extra electrons or lose some of their electrons. The nucleus doesn't change at all. In the chapter text, we learned that ionization sometimes makes poor conductors into good conductors, so the correct answer is (a).
• 9. In the chapter text, we learned that pure elemental silver is the best known electrical conductor. The correct answer is (d).
• 10. The correct answer is (b). In the chapter text, we learned that in most gases, the atoms are too widely separated to allow for the easy passage of electrons from atom to atom. You might think that (c) is also correct, but it isn't. The electrons certainly do move in a gas! They "orbit" their "parent nuclei" at great speed (as they do in all atoms), even though they don't readily move from one atomic nucleus to another.
• 11. In the chapter text, we learned that if we impose a potential difference of 1 V across a component having a resistance of 1 ohm, we get 1 A of current. We also learned that if we double the voltage across a component whose resistance remains constant, we double the current. Therefore, the correct answer is (c).
• 12. Once again, if we double the voltage but leave the resistance unchanged, we double the current. The correct answer is (c).
• 13. We can define a hole as a place where we would normally expect to find an electron, but for some reason the electron isn't there. Holes don't have anything to do with protons, neutrons, or the existence of electron shells. The correct answer is therefore (a).
• 14. The correct answer is (a). All good conductors have low resistance. Answer (d) doesn't work, because no conductor exhibits zero resistance in the "real world." Answer (b) is absolutely wrong! You might feel the temptation to choose (c), but that statement applies to semiconductors, not to good conductors in general.
• 15. The number of electrical charge carriers on an object constitutes the quantity of its charge. We express that parameter in coulombs, so the correct answer is (d).
• 16. When a lightning stroke occurs, a potential difference is equalized by a flow of electrons from atom to atom through ionized air. The general direction of electron movement is away from the negative pole and toward the positive pole. The correct answer is (b).
• 17. The chapter text tells us that engineers express resistance in ohms. As the value in ohms increases, so does the resistance. The correct answer is (d).
• 18. A battery stores chemical energy. If we connect a component across the battery terminals so that current flows, the battery converts chemical energy to electrical energy. The correct answer is (b). Generators convert mechanical energy to electrical energy, so (a) is wrong. Motors convert electrical energy to mechanical energy, so (c) doesn't work. Obviously, answer (d) is wrong then!
• 19. A generator converts mechanical energy to electrical energy, so the correct answer is (a). Batteries convert chemical energy to electrical energy, so (b) is wrong. Motors convert electrical energy to mechanical energy, so (c) is wrong. Answer (d) is of course wrong because we've already found that answer (a) works.
• 20. No generator, battery, or motor can convert electrons into protons, so the correct answer is (d). Nobody has ever built a device that can change an electron directly into a proton.

Electronics Review Materials

Teach Yourself Electricity and Electronics, 5th edition by Stan Gibilisco

credit: Gibilisco©2013 www.FroydWess.com

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