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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 current.
 power.
 speed.
 torque.

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 3 - phase to ground fault.
 3 - phase fault.
  line to ground fault.
 line to line fault.

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

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

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Electrical Machines
Which motor cannot be started on no load?

 cumulative compound motors
 series motors
 shunt motors
 both B and C

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Electrical Machines
The type of DC motor used for shears and punches is

 Series motor.
  Cummulative compound motor.
 Shunt motor.
 Differential compound motor.

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 600 W
 700 W
 650 W
 625 W

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