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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and high
 high and high
 high and low
 low and low

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Electrical Machines
Which of these types of motor is used in elevators?

 None of these.
 DC shunt motor.
 DC compound motor.
 DC series motor.

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 Decreases.
 None of above.
  Increases.
 Remains unchanged.

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

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

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 50 Hz.
  3 Hz.
 10 Hz.
  2 Hz.

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Electrical Machines
Which of the following statements are correct ?

 Both 1 and 2.
 The leakage reactance of the induction motor should be small.
None of these
 A small value of leakage reactance will increase the maximum power output of motor.

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