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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

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

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Electrical Machines
Transformer oil is used as

 inert medium.
 both A and B.
 a coolant.
 an insulator.

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 None of above.
 Proportional to the square of armature current.
 Inversely proportional to the armature current.
 Proportional to the armature current.

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Electrical Machines
A DC series motor has which of the following characteristics?

 Can be started easily without load.
 Has a poor torque.
 Has a almost constant speed.
 Has its field winding consinting of thick wire and less no of turns.

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 1.0.
  1.5 to 2.
 2 to 3.
 3 to 5.

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

 On armature.
None of these
 On yoke in the inter pole gap.
  On yoke in the pole faces.

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