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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/(1-S)
 S
 1/S
 1-S

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Electrical Machines
In a transformer which of the following losses are zero?

 Iron loss
 Rotational loss
 Copper loss
All of these

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 48.0%.
 59.2%.
 57.1%.
 88.8%.

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  repulsion motor type starting.
  capacitor run IM.
  transformer with short-circuited secondary.
  synchronous motor.

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Electrical Machines
Which of the following motor has more stability

 cylindrical motor
None of these
 salient pole motor
 both motors has same stability

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Electrical Machines
Synchronous reactance of an alternator represents

 armature reactance and leakage reactance
 a reactance operating at synchronous speed
All of these
 field winding reactance

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