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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Nr
 S.Ns
 Ns
 Zero

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Electrical Machines
If the field circuit of a DC shunt motor is opened

  The motor will attain dangerously high speed.
 DC Shunt Motor
 The speed of motor will be reduced.
 The armature current will reduce.

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Electrical Machines
Which motor used in Lathe machine?

None of these
  D.C. cumulative compound motor.
  D.C . series motor.
  D.C. shunt motor.

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 DC Shunt motor.
 DC compound motor.
 Separately excited DC motor.
 DC series motor.

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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

 None of these.
 Increase.
 Remains same.
  Decrease.

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Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

 Depends on other factor.
 Reduce by 5%.
 Remain unchanged.
  Increase by 5%.

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