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Alternating Current and voltage Theory Quiz Questions
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Question 1 of 10
1. Question
The frequency of sine wave is 60 Hz. What is the period?
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Answer: 16.7 msec
Explanation:
T= 1/f = /60 = 16.7 msec 
Question 2 of 10
2. Question
The difference between alternating current (AC) and direct current (DC) is
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Question 3 of 10
3. Question
During each cycle the sine way reaches a peak value
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Question 4 of 10
4. Question
A sine wave with a frequency of 12 k Hz is changing at a faster rate than a sine wave with a frequency of
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Question 5 of 10
5. Question
When a sine wave has a frequency of 60 Hz, in 10 sec it goes through
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Question 6 of 10
6. Question
The average value of a 10 V peak sine wave over one complete cycle is
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Question 7 of 10
7. Question
The average half cycle value of a sine wave with a 20 V peak is
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Answer: 12.74 V
Explanation:
V _{average} = 0.637 V_{P}
= 0.637 * 20 = 12.74 V 
Question 8 of 10
8. Question
If the rms current through a 10 kΩ resistor is 5 mA, the rms voltage drop across the resistor is
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Question 9 of 10
9. Question
The duty cycle of a square wave
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Question 10 of 10
10. Question
A 10 kHz pulse wave form consists of pulses that are 10µs wide. Its duty cycle is
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Answer: 10 %
Explanation:
Duty cycle = ( t_{w }/ T_{S}) * 100 %
= ( 10 µs) / (1/ 10 kHz) * 100 %
= 10 %