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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

 decrease
 increase
None of these
 either increase or decrease

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 20KVA
 0KVA
 4KVA
 16KVA

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Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  pulsating.
  sinusoidal.
  flat topped.
 triangular.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Both 1 and 2
 Hysteresis losses
 Eddy current losses
 Copper losses

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 0.98
 0.04, 0.96
 0.04, 1.96
 0.02, 1.98

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

None of these
  Cast iron bearings.
  Bush bearings.
  Ball bearings.

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