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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 finite value
 0
 infinite value
 1

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

 Air compressors.
  Conveyers.
 Blowers.
 Centrifugal pumps.

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

 DC Shunt Motor
 Induction motor.
 Synchronous motor.
 AC single phase motor.

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Electrical Machines
Regenerative braking is not found in which motor?

 DC compound.
  DC series.
 DC shunt.
 Induction motor.

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Electrical Machines
Armature of DC machine is made of

 non-ferrous material.
 silicon steel.
 conducting material.
 insulating material.

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 Heavy sparking at the first stud of starting resistance steps.
 Heavy sparking at brushes.
 Both of above.
 None of these.

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