Q. When is the shape of the negative half of the emf waveform equal to the positive half?

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Q. Which is the correct formula for frequency in an ac generator?

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Q. What will happen to the frequency if the number of revolutions increases?

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Q. What happens to the frequency if the number of pairs of poles increases?

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Q. Calculate the frequency if the number of revolutions is 300 and the paired poles are 50.

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Q. Calculate the number of revolutions if the frequency is 15kHz and the paired poles are 50.

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Q. Calculate the number of paired poles if the frequency id 15kHz and the number of revolutions is 300.

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Q. What is the frequency of a two pole machine having n=50?

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Q. What is the minimum number of poles that a machine must have __________

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Q. Find the average value of current when the current that are equidistant are 4A, 5A and 6A.

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Q. What is the current found by finding the current in an equidistant region and dividing by n?

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Q. RMS stands for ________

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Q. What is the type of current obtained by finding the square of the currents and then finding their average and then fining the square root?

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Q. __________ current is found by dividing the area enclosed by the half cycle by the length of the base of the half cycle.

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Q. What is the effective value of current?

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Q. In a sinusoidal wave, average current is always _______ rms current.

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Q. For a rectangular wave, average current is ______ rms current.

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Q. Peak value divided by the rms value gives us?

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Q. Calculate the crest factor if the peak value of current is 10A and the rms value is 2A.

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Q. If maximum value of current is 5√2 A, what will be the value of RMS current?

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