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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

 5%
 2%
 4%
 25%

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 not suitable for rapidly changing loads.
 less expensive.
 none of above.
 constant speed.

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

  340 A.
  460 A.
 250 A.
 570 A.

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Electrical Machines
Regenerative braking is not found in which motor?

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

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

  8.
 2.
 4.
 1.

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Electrical Machines
Dummy coils are used for

 reducing armature reaction.
All of these
 mechanical balancing.
 increasing efficiency.

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