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Electrical Machines

Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 4%
 5%
 25%
 2%

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Electrical Machines
It is advisable to start a DC series motor with some load to

 Limit the current.
 Avoid sparking.
 Limit the flux.
  Limit the speed.

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Slip.
 Running torque.
 Line voltage.
 Rotor current.

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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

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

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = θmech
 θelec = P/2*θmech
 θelec = 2/P*θmech
 θelec = 4/P*θmech

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

 decreases.
 increases.
None of these
 remains same.

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MORE MCQ ON Electrical Machines

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