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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 induction motor
 DC motor
 DC generator
 AC generator

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Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 1000 rpm
 950 rpm
 850 rpm
 900 rpm

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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.
  60, 1500.
 50, 1500.
 1440, 1500.

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 No wave and lap winding.
 Wave winding.
 Lap winding.
 Both wave and lap winding.

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 either of these
 constant V, Tst increases
 constant supply voltage V, starting torque Tst decreases
None of these

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Electrical Machines
The voltmeter connected across a generator reads voltage same at no load and at full load (rated). The generator is of the type

 series generator.
  shunt generator.
  short - shunt generator.
  level compound.

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