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Electrical Machines

Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 92%
 95%
 96%
 94%

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 either increase or decrease
None of these
 decrease
 increase

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Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?

 pure inductive load
 pure resistive load
 pure capacitive load
None of these

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Electrical Machines
The basic function of a transformer is to change

 the frequency
 the power factor
 the level of the voltage
 the power level

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

 10 Ω.
  4 Ω.
 8 Ω.
  2 Ω.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 250 rpm
 2000 rpm
 500 rpm
 1000 rpm

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