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Electrical Machines

Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 500 VA
 110 VA
 100 VA
 550 VA

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Electrical Machines
What are slot wedges in a DC machine made of?

 Fibre.
 Cast iron.
 Mild steel.
 Silicon steel.

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  crawling.
  relative speed.
  cogging.
  air gap.

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Four times.
 Remains same.
 Eight times.
 Doubled.

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 2
 0
 1
 3 or 4

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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

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

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