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Electrical Machines

Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very low.
 Very high.
 Zero.
 Normal.

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Electrical Machines
Which method is less recommendable for induction motor starting in the industries?

  Direct online starting.
  Auto transformer starting.
  Rotor resistance starting.
  Stator resistance starting.

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Electrical Machines
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 in parallel
 either of these depending on the design of the motor
 in series
 through inductive coupling

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the speed of motor will be reduced.
 the armature current will reduce.
 the motor will come to stop.
 the motor will attain dangerously high speed.

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Electrical Machines
Maximum power will be developed when back emf is

 double the supply voltage.
 half of the supply voltage.
All of these
 equal to supply voltage.

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

  stator phases of the motor.
  starting resistance in the starter.
  rotor at slip rings.
None of these

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