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Electrical Machines

Electrical Machines
Slip exists in

  synchronous motor.
  induction motor.
  none of above.
  in both machines.

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

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

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Power factor and field current.
  Armature current and field current.
 Armature current and torque.
 Torque and field current.

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Electrical Machines
An IM cannot run at synchronous speed because

  air friction will prevent it.
  rotor torque will not be produced.
  induction motor will become synchronous motor.
  none of above.

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 neither the voltage nor the torque
 voltage but not the torque
 both the torque and voltage
 torque but not the voltage

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 None of above.
 Armature current.
 Field current.
 Line current.

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MORE MCQ ON Electrical Machines

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