Alternating Current and Voltage MCQ Test - ObjectiveBooks
Hello everybody! You can translate the content of this page by selecting a language in the select box.

# Practice Test: Question Set - 03

1. A 20 kHz pulse waveform consists of pulses that are 15 μs wide. The duty cycle
(A) Is 1%
(B) Is 30%
(C) Is 100%
(D) Cannot be determined

2. The designation rms means repetitions measured per second.
(A) True
(B) False

3. The average value of a 12 V peak sine wave over one complete cycle is
(A) 0 V
(B) 1.27 V
(C) 7.64 V
(D) 6.37 V

4. A square wave has a period of 60 μs. The first odd harmonic is
(A) 5 kHz
(B) 50 kHz
(C) 500 kHz
(D) 33.33 kHz

5. A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of
(A) 0.0045 s
(B) 2 ms
(C) 1.5 ms
(D) 3,000 μs

6. 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
(A) 16.54 V
(B) 1.65 V
(C) 10.60 V
(D) 5.93 V

7. A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is
(A) 4 V
(B) 4.6 V
(C) 1.6 V
(D) 11 V

8. A signal with a 400 μs period has a frequency of
(A) 250 Hz
(B) 2,500 Hz
(C) 25,000 Hz
(D) 400 Hz

9. Average value of a sine wave is 0.707 times the peak value.
(A) True
(B) False

10. A saw-tooth wave has a period of 10 ms. Its frequency is
(A) 10 Hz
(B) 50 Hz
(C) 100 Hz
(D) 1,000 Hz

11. The length of a phasor represents the amplitude.
(A) True
(B) False

12. 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

13. A 1 kHz signal has a period of 1 ms.
(A) True
(B) False

14. The average half-cycle value of a sine wave with a 40 V peak is
(A) 25.48 V
(B) 6.37 V
(C) 14.14 V
(D) 50.96 V

15. Duty cycle is the characteristic of a pulse waveform that indicates the high time versus the low time.
(A) True
(B) False

Show and hide multiple DIV using JavaScript View All Answers

Blogger Comment