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Electrical Engineering
Alternating Current And Voltage
Quiz 1
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Q.1
Duty cycle is the characteristic of a pulse waveform that indicates the high time versus the low time.
True
False
Q.2
A 20 kHz pulse waveform consists of pulses that are 15 µs wide. The duty cycle
Is 1%
Is 30%
Is 100%
Cannot be determined
Q.3
If the rms current through a 6.8 kΩ resistor is 8 mA, the rms voltage drop across the resistor is
5.44 V
54.4 V
7.07 V
8 V
Q.4
The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%.
True
False
Q.5
A square wave has a period of 60 µs. The first odd harmonic is
5 kHz
50 kHz
500 kHz
33.33 kHz
Q.6
Periodic is characterized by a repetition at fixed time intervals.
True
False
Q.7
If the rms current through a 4.7 kΩ resistor is 4 mA, the peak voltage drop across the resistor is
4 V
18.8 V
26.6 V
2.66 V
Q.8
A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is
25%
50%
1%
100%
Q.9
The length of a phasor represents the amplitude.
True
False
Q.10
If the rms voltage drop across a 15 kΩ resistor is 16 V, the peak current through the resistor is
15 mA
1.5 mA
10 mA
1 mA
Q.11
The angular position of a phasor represents the angle of the sine wave with respect to a reference.
True
False
Q.12
The unit of frequency is the hertz.
True
False
Q.13
The designation rms means repetitions measured per second.
True
False
Q.14
A saw-tooth wave has a period of 10 ms. Its frequency is
10 Hz
50 Hz
100 Hz
1,000 Hz
Q.15
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
0°
45°
40°
None of the above
Q.16
How many degrees are there in p/3 rad?
6°
60°
180°
27°
Q.17
The average value of a 12 V peak sine wave over one complete cycle is
0 V
1.27 V
7.64 V
6.37 V
Q.18
A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is
45.12 mA
16 mA
39.6 mA
22.6 mA
Q.19
If the peak of a sine wave is 13 V, the peak-to-peak value is
6.5 V
13 V
26 V
None of the above
Q.20
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
16.54 V
1.65 V
10.60 V
5.93 V
Q.21
A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of
25 kHz
12 kHz
18 kHz
1.3 MHz
Q.22
When a sine wave has a frequency of 100 Hz in 12 s it goes through
1/100 cycle
12 cycles
120 cycles
1,200 cycles
Q.23
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
40 Hz
100 Hz
400 Hz
Indeterminable
Q.24
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
6 V
30 V
35 V
0 V
Q.25
A 1 kHz signal has a period of 1 ms.
True
False
Q.26
A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of
0.0045 s
2 ms
1.5 ms
3,000 µs
Q.27
The instantaneous value is the voltage or current value of a waveform at its peak.
True
False
Q.28
If a sine wave goes through 10 cycles in 20 µs, the period is
20 µs
4 µs
2 µs
100 µs
Q.29
A phasor represents
The magnitude and a quantity direction
The width of a quantity
The phase angle
The magnitude of a quantity
Q.30
Average value of a sine wave is 0.707 times the peak value.
True
False
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