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Electrical Machines

Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 increases.
None of these
 remains same.
 decreases.

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Electrical Machines
The slot edges in a DC machine are made of

 Mild steel.
  Fibre.
 Silicon steel.
 Cast iron.

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at heavy loads only
 low at light loads only
 low at rated load only
 both A and B

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 230 V.
 200 V.
 115 V.
 460 V.

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Electrical Machines
A DC generator without commutator is a

 AC generator
 DC motor
 induction motor
 DC generator

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

  Decrease.
 None of these.
 Remains same.
 Increase.

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