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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 36 W.
 25 W.
 30 W.
 28 W.

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Electrical Machines
A synchronous motor will deliver maximum power when

  load angle is 45°.
  input power factor is unity.
  load angle is equal to internal angle θ.
  load angle is 0°.

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

 Insulation requirement is less.
 Operating cost is less.
All of these
 Collecting of large current is simple.

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in series with the series field
 in parallel with the shunt field
 in parallel with the series field
 in series with the shunt field

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Electrical Machines
The constant losses in transformer is/are

 hysteresis loss.
 copper loss.
 both 2 and 3.
 eddy current loss.

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 1.98
 0.04, 0.96
 0.04, 1.96
 0.02, 0.98

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