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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.05.
  0.1.
  0.5.
  1.0.

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Reluctance motor.
 Hysteresis motor.
  Stepper motor.
 Shaded pole motor.

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Supply voltage.
  Armature current.
  Field excitaion.
  Armature voltage.

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Electrical Machines
Dynamic braking is employed to brake

 reversing drive
None of these
 both 1 and 2
 non reversing drive

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Electrical Machines
Transformer cooling and insulating oil must be of

 high viscosity.
 low BDV.
  low viscosity.
 low resistivity.

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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 will

 increase.
 none of these.
 Decrease.d
 remains same.

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