17th
Feb
AC Fundamentals, Circuits, and Circuit Theory MCQ

AC Fundamentals, Circuits, and Circuit Theory MCQ

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  • 17th Feb, 2023
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AC Fundamentals, Circuits, and Circuit Theory MCQ Test

1) Which of the following option refers to a parallel circuit?

  • A. The current through each element is same
  • B.The equivalent resistance is greater than any one of the resistors
  • C.The voltage across element is in proportion to it's resistance value
  • D.The current through any one element is less than the source current

2) With which of the following option the transient currents are associated?

  • A. Resistance of the circuit
  • B.Impedance of the circuit
  • C.Applied voltage to the circuit
  • D.Changes in the stored energy in the inductors and capacitors

3) Power factor of an electrical circuit is equal to

  • A. R/Z
  • B.Ratio of useful current to total current Iw/I
  • C.Cosine of phase angle difference between current and voltage
  • D.All of the above

4) The time constant of a series R-C circuit is given by

  • A. RC
  • B.R/C
  • C.RC2
  • D.R2C

5) The ratio of active power to apparent power is known as which factor?

  • A. Form
  • B.Load
  • C.Power
  • D.Demand

6) Power factor of electric bulb is ............

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

7) The power factor at resonance in R-L-C parallel circuit is

  • A. Unity
  • B.Zero
  • C.0.8 leading
  • D.0.08 lagging

8) The period of a wave is

  • A. Expressed in amperes
  • B.The same as frequency
  • C.Time required to complete one cycle
  • D.None of the above

9) Which of the following coil will have large resonant frequency?

  • A. A coil with low resistance
  • B.A coil with large resistance
  • C.A coil with low distributed capacitance
  • D.A coil with large distributed capacitance

10) The r.m.s. value and mean value is the same in the case of

  • A. Sine wave
  • B.Square wave
  • C.Triangular wave
  • D.None of the above

11) For a frequency of 200 Hz, the time period will be

  • A. 0.5 s
  • B.0.05 s
  • C.0.005 s
  • D.0.0005 s

12) Capacitive reactance is more when

  • A. Capacitance is less and frequency of supply is more
  • B.Capacitance is more and frequency of supply is less
  • C.Capacitance is less and frequency of supply is less
  • D.Capacitance is more and frequency of supply is more

13) Time constant of an inductive circuit

  • A. Increases with decrease of inductance and increase of resistance
  • B.Increases with increase of inductance and decrease of resistance
  • C.Increases with the decrease of inductance and decrease of resistance
  • D.None of the above

14) Capacitive susceptance is a measure of

  • A. Reactive power in a circuit
  • B.A purely capacitive circuit's ability to pass current
  • C.The extent of neutralization of reactive power in a circuit
  • D.A purely capacitive circuit's ability to resist the flow of current

15) The double energy transient occur in the

  • A. R-L circuit
  • B.R-C circuit
  • C.R-L-C circuit
  • D.Purely inductive circuit

16) The power factor of a D.C. circuit is always

  • A. Unity
  • B.Zero
  • C.Less than unity
  • D.Greater than unity

17) In a series resonant circuit, the impedance of the circuit is

  • A. Zero
  • B.Minimum
  • C.Maximum
  • D.None of the above

18) Power factor of the following circuit will be zero

  • A. Inductance
  • B.Capacitance
  • C.Resistance
  • D.Both A & B

19) Power factor of an inductive circuit is usually improved by connecting capacitor to it in

  • A. Series
  • B.Parallel
  • C.Both A & B
  • D.None of the above

20) Which of the following circuit component opposes the change in the circuit voltage ?

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

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