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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. The average value of a 12 V peak sine wave over one complete cycle is

Options

A : 0 V

B : 1.27 V

C : 7.64 V

D : 6.37 V

2. If the peak of a sine wave is 13 V, the peak-to-peak value is

Options

A : 6.5 V

B : 13 V

C : 26 V

D : none of the above

3. Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true?

Options

A : Wave A leads wave B by 15°.

B : Wave A lags wave B by 15°.

C : Wave A leads wave B by 105°.

D : Wave A lags wave B by 105°.

4. A phasor represents

Options

A : the magnitude and a quantity direction

B : the width of a quantity

C : the phase angle

D : the magnitude of a quantity

5. A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is

Options

A : 25%

B : 50%

C : 1%

D : 100%

6. A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is

Options

A : 45.12 mA

B : 16 mA

C : 39.6 mA

D : 22.6 mA

7. The average half-cycle value of a sine wave with a 40 V peak is

Options

A : 25.48 V

B : 6.37 V

C : 14.14 V

D : 50.96 V

8. To produce an 800 Hz sine wave, a four-pole generator must be operated at

Options

A : 200 rps

B : 400 rps

C : 800 rps

D : 1,600 rps

9. If a sine wave goes through 10 cycles in 20 µs, the period is

Options

A : 20 µs

B : 4 µs

C : 2 µs

D : 100 µs

10. A sine wave with an rms value of 12 V is riding on a dc level of 18 V. The maximum value of the resulting waveform is

Options

A : 6 V

B : 30 V

C : 35 V

D : 0 V

1. One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is

Options

A : 0°

B : 45°

C : 40°

D : none of the above

2. A square wave has a period of 60 µs. The first odd harmonic is

Options

A : 5 kHz

B : 50 kHz

C : 500 kHz

D : 33.33 kHz

3. The conductive loop on the rotor of a simple two-pole, single-phase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is

Options

A : 40 Hz

B : 100 Hz

C : 400 Hz

D : indeterminable

4. A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of

Options

A : 25 kHz

B : 12 kHz

C : 18 kHz

D : 1.3 MHz

5. A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of

Options

A : 0.0045 s

B : 2 ms

C : 1.5 ms

D : 3,000 µs

1. Two series resistors are connected to an ac source. If there are 7.5 V rms across one resistor and 4.2 V rms across the other, the peak source voltage is

Options

A : 16.54 V

B : 1.65 V

C : 10.60 V

D : 5.93 V

2. If the rms current through a 6.8 k? resistor is 8 mA, the rms voltage drop across the resistor is

Options

A : 5.44 V

B : 54.4 V

C : 7.07 V

D : 8 V

3. How many degrees are there in ?/3 rad?

Options

A : 6°

B : 60°

C : 180°

D : 27°

4. A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is

Options

A : 4 V

B : 4.6 V

C : 1.6 V

D : 11 V

5. A sawtooth wave has a period of 10 ms. Its frequency is

Options

A : 10 Hz

B : 50 Hz

C : 100 Hz

D : 1,000 Hz

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