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Alternating Current And Voltage Online Exam Quiz

Important questions about Alternating Current And Voltage. Alternating Current And Voltage MCQ questions with answers. Alternating Current And Voltage exam questions and answers for students and interviews.

1. In both induction and synchronous ac motors

Options

A : the operating speed is very steady

B : the stator magnetic field is stationary

C : the stator magnetic field rotates

D : the "squirrel cage" forms the rotor

2. What is the fourth harmonic of a fundamental frequency of 400 Hz?

Options

A : 100 Hz

B : 4 kHz

C : 4 Hz

D : 1.6 kHz

3. What is the instantaneous peak voltage at 250° on a 6 V peak sine wave?

Options

A : +5.64 V

B : ?5.64 V

C : +26.13 V

D : ?26.13 V

4. Which point is the trailing edge of the repetitive pulse waveform in the given circuit?

Options

A : Point A

B : Point B

C : Point C

D : Point D

5. What type of waveform is shown in the given circuit?

Options

A : Sine wave

B : Square wave

C : Triangle wave

D : Sawtooth wave

6. What is the dc voltage of the waveform in the given circuit?

Options

A : 2 V

B : 4 V

C : 6 V

D : 8 V

1. What is the peak voltage across R 3 in the given circuit?

Options

A : 1.2 V

B : 5 V

C : 7 V

D : 12 V

3. A single-phase induction motor

Options

A : is self-starting

B : operates at a fixed speed

C : is less reliable than a three-phase synchronous motor

D : none of the above

4. What is the peak-to-peak voltage of the waveform in the given circuit?

Options

A : 2 V

B : 4 V

C : 6 V

D : 8 V

5. What is the average voltage when a rectangular wave's base line voltage is 20 V, its peak-to-peak voltage is 50 V, and its duty cycle is 20%?

Options

A : 26 V

B : 30 V

C : 40 V

D : 45 V

6. Calculate the duty cycle of the repetitive pulse waveform in the given circuit.

Options

A : 8.33%

B : 0%

C : 33.33%

D : 25%

7. A half-cycle average voltage of 12 V is equal to what rms voltage?

Options

A : 13.33 V

B : 8.48 V

C : 18.84 V

D : 7.64 V

8. The effective value of a sine wave is equal to

Options

A : 0.707 of peak voltage

B : 0.636 of peak voltage

C : sin 45° of peak voltage

D : both 0.707 of peak voltage and sin 45° of peak voltage

9. Most practical alternators generate electricity from

Options

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

10. Calculate the positive-going slope of the waveform in the given circuit.

Options

A : 5 V/ms

B : 2.5 V/ms

C : 2.5 V/s

D : 5 V/s

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