Electrical Engineering - Alternating Current and Voltage

Exercise :: Alternating Current and Voltage - General Questions

16. 

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

Answer: Option A

Explanation:

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17. 

If a sine wave goes through 10 cycles in 20 s, the period is

A. 20 s
B. 4 s
C. 2 s
D. 100 s

Answer: Option C

Explanation:

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18. 

A square wave has a period of 60 s. The first odd harmonic is

A. 5 kHz
B. 50 kHz
C. 500 kHz
D. 33.33 kHz

Answer: Option B

Explanation:

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19. 

Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true?

A. Wave A leads wave B by 15°.
B. Wave A lags wave B by 15°.
C. Wave A leads wave B by 105°.
D. Wave A lags wave B by 105°.

Answer: Option A

Explanation:

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20. 

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

Answer: Option A

Explanation:

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