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
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