30th
Mar
Alternating Current and Voltage MCQ

Alternating Current and Voltage MCQ

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  • 30th Mar, 2022
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Alternating Current and Voltage MCQ Questions

Take Alternating Current and Voltage MCQ Test & Online Quiz to test your Knowledge

Below is the Alternating Current and Voltage MCQ test that checks your basic knowledge of Alternating Current and Voltage. This Alternating Current and Voltage MCQ Test contains 20 Multiple Choice Questions. You have to select the right answer to the question. Apart form this, you can also download Alternating Current and Voltage MCQ PDF completly free.

Alternating Current and Voltage MCQ Test

1) AC stands for ________.

  • A. direct current
  • B.Action current
  • C.Alter current
  • D.alternating current

2) A phasor represents ___________.

  • A. The magnitude and a quantity direction
  • B.The width of a quantity
  • C.The phase angle
  • D.The magnitude of a quantity

3) What is the peak to peak voltage of the waveform?

  • A. just the full vertical length of a voltage waveform from the very top to the very bottom on the circuit.
  • B.just the full horizontal length of a voltage waveform from the very top to the very bottom
  • C.just the full horizontal length of a voltage waveform from the very left to the right
  • D.None of the above

4) A half cycle average voltage of 12 v is equal to ____ rms voltage

  • A. 13.33 V
  • B.64 V
  • C.18.84 V
  • D.8.48 V

5) What is the fourth harmonic of a fundamental frequency of 400hz?

  • A. 100 Hz
  • B.4 kHz
  • C.4 Hz
  • D.1.6 kHz

6) The peak value of a sine wave is equal to ____ the RMS value.

  • A. 1.414 x
  • B.1.44 x
  • C.0.414 x
  • D.None of the above

7) What do you mean by alter alternator?

  • A. An alternator is an electrical generator that converts mechanical energy to electrical energy in the form of alternating current.
  • B.DC
  • C.AC
  • D.None of the above

8) The term “RMS” stands for __________ in electronics.

  • A. Root-Mean-Squared
  • B.Read Only Memory
  • C.Random Machine System
  • D.None of the above

9) A sine wave's peak-to-peak voltage value is always twice its peak voltage value.

  • A. False
  • B.True

10) If a wave has frequency of 2 Hz, it has a period of ?

  • A. 1s
  • B.1/2 s
  • C.2.5s
  • D.2s

11) Most practical alternators generate electricity from _____.

  • A. a coil rotating within a magnetic field
  • B.a magnetic field rotating around fixed windings
  • C.a permanent magnet rotating within a varying electromagnetic field
  • D.none of the above

12) Transformer works on the principle of _____.

  • A. convertor
  • B.invertor
  • C.mutual induction
  • D.self-induction

13) What do you mean by Instantaneous Value?

  • A. The value of alternating voltage and current at an instant t.
  • B.The value of direct current which produces the same heating effect in a given resistor as is produced by the given alternating current when passed for the same time.
  • C.It is defined as that value of direct current which sends the same charge in a circuit in the same time as is sent by the given alternating current in its half time period.
  • D.Maximum values of voltage and current in a cycle

14) Root Mean Square Value is ________.

  • A. Random Access Memory
  • B.The value of direct current which produces the same heating effect in a given resistor as is produced by the given alternating current when passed for the same time.
  • C.The value of alternating voltage and current at an instant t.
  • D.None of the above

15) Is Mean or average value is defined as that value of direct current which sends the same charge in a circuit in the same time as is sent by the given alternating current in its half time period.

  • A. Yes
  • B.No

16) Which one is the reciprocal of impedance?

  • A. Admittance
  • B.Inductance
  • C.Reactance
  • D.Conductance

17) Why can’t the DC ammeter measure an alternating current?

  • A. AC cannot pass through a DC ammeter
  • B.AC changes its direction
  • C.AC is virtual
  • D.The average value of a complete cycle is zero

18) Who invented the AC?

  • A. Jaes Goslig
  • B.Nikola Tesla and Otto Blathy
  • C.Lerdrof Each
  • D.Tim Bernners Lee

19) In a series resonant circuit, the a.c. voltage across resistance R, inductance L and capacitance C are 5V, 10V and 10V, respectively. The a.c. voltage applied to the circuit will be _______.

  • A. 20V
  • B.10V
  • C.5V
  • D.25V

20) In a series L, R, C, circuit which is connected to a.c. source. When resonance is obtained then net impedance Z will be _____.

  • A. Z = R
  • B.Z = ωL -1/ωC
  • C.Z = ωL
  • D.Z = 1/ωC

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