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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 625 W
 700 W
 650 W
 600 W

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Field resistance control.
 Armature circuit resistance control.
 Any of above.
 Armature voltage control.

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Electrical Machines
In a DC compound motor the field regulator is provided to

 control the field flux.
 demagnetize the field partially.
 limit the armature current.
 control the armature flux.

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Electrical Machines
A commutator in DC machines can 1. provide half-wave rectification 2. Provide full-wave rectification 3. convert ac to dc 4. Convert dc to ac 5. provide controlled full-wave rectification From these, the correct answer is

 2, 3, 4
 2, 3, 4, 5
 2, 3 ,5
 1, 2, 3

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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is

 3 only
 1, 2 and 3
 1, 2, 3 and 4
 1, 3

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 60, 1440.
 50, 1500.
  60, 1500.
 1440, 1500.

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