Alternating Current and Voltage Online Test – Multiple Choice Questions and Answers

1. What is the average voltage when a rectangular wave’s base line voltage is 20 V, its peak-to-peak voltage is 50 V, and its duty cycle is 20%?

 
 
 
 

2. A rectangular wave that has a duty cycle of 50% could be called a

 
 
 
 

3. A half-cycle average voltage of 12 V is equal to what rms voltage?

 
 
 
 

4. Most practical alternators generate electricity from

 
 
 
 

5. In both induction and synchronous ac motors

 
 
 
 

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

 
 
 
 

7. What is the instantaneous peak voltage at 250° on a 6 V peak sine wave?

 
 
 
 

8. What is the fourth harmonic of a fundamental frequency of 400 Hz?

 
 
 
 

9. A single-phase induction motor

 
 
 
 

10. The effective value of a sine wave is equal to

 
 
 
 

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