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:
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 XL 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. I2XL
- C. IXL
- D. IXL2
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 RL and internal resistance R of the voltage source?
- A. RL = 2 r
- B. RL = 1.5 r
- C. RL = r
- D. RL = 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
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