Question 41 : What is the minimum number of poles that a machine must have __________
1. 1
2. 2
3. 4
4. 10
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Question 42 : What is the frequency of a two pole machine having n=50?
1. 100Hz
2. 200Hz
3. 50Hz
4. 25Hz
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Question 43 : Calculate the number of paired poles if the frequency id 15kHz and the number of revolutions is 300.
1. 10
2. 30
3. 50
4. 70
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Question 44 : Calculate the number of revolutions if the frequency is 15kHz and the paired poles are 50.
1. 100
2. 200
3. 300
4. 400
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Question 45 : Calculate the frequency if the number of revolutions in 300 and the paired poles are 50.
1. 15kHz
2. 150kHz
3. 1500kHz
4. 150Hz
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Question 46 : What happens to the frequency if the number of pairs of poles increases?
1. Increases
2. Decreases
3. Remains the same
4. Becomes zero
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Question 47 : What will happen to the frequency if the number of revolutions increases?
1. Increases
2. Decreases
3. Remains the same
4. Becomes zero
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Question 48 : Which is the correct formula for frequency in an ac generator?
1. f=pn
2. f=p/n
3. f=n/p
4. f=n2p
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Question 49 : When is the shape of the negative half of the emf waveform equal to the positive half?
1. When the conductors move past north pole
2. When conductors move past south pole
3. When conductors move past both north and south pole
4. When conductors are stationary
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Question 50 : The waveform of the emf generated undergoes one complete cycle when?
1. Conductors move past north pole
2. Conductors move past south pole
3. Conductors move past north and south poles
4. Conductors are stationary
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