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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 30°.
 120°.
 60°.
 90°.

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Electrical Machines
Induction motors have the advantage of

  all of below.
  less maintenance.
  less cost.
  simple in construction.

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

 0.16 pu.
  0.08 pu.
  0.02 pu.
 0.01 pu.

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Synchronous motors.
  Universal motor.
  Slip ring induction motor.
  Reluctance motor.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing all the three leads from the supply.
  transposing any two leads from slip rings.
  disconnecting any one phase.
  transposing any two leads from supply.

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 some what less than 230 V
 230 V
 not possible
 some what more than 230 V

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MORE MCQ ON Electrical Machines

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