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Electrical Machines

Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 24
 12
 10
 5

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Oscillate around the normal speed.
 Increase.
 Remain unaltered.
 Reduce.

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 1400W, 1000W
 800W, 1600W
 1000W , 1400W
 1600W, 800W

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

 238.2 V.
  256.4 V.
 271.7 V.
 240 V.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 3000W
 500W
 1000W
 100W

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 remains same.
None of these
 increases.
 decreases.

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