Alternating Current and Voltage - EEE Questions and Answers

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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

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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

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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

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A sawtooth wave has a period of 10 ms. Its frequency is

10 Hz

50 Hz

100 Hz

1,000 Hz

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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

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

100

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

5 kHz

50 kHz

500 kHz

33.33 kHz

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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?

Wave A leads wave B by 15°.

Wave A lags wave B by 15°.

Wave A leads wave B by 105°.

Wave A lags wave B by 105°.