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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.7.
  0.54.
  1.
 0.3.

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  1/Ia.
  Ia2.
  Ia.
  √Ia.

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

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

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 45 ppm.
 25 ppm.
  35 ppm.
 20 ppm.

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

 cylindrical.
 non uniform cylindrical.
  salient.
 none of these.

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  approx to one.
  greater than one.
  very low
  less than one.

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