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Electrical Machines

Electrical Machines
No load test of 3-phase induction motor gives which of the following?

 variable loss
 both A and B
None of these
 constant loss

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Electrical Machines
Which of the following bearings and their uses are correct

 neither 1 nor 2
 both A and B
 roller bearings → large machines
 ball bearings → small machines

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

  2 Ω.
 10 Ω.
  4 Ω.
 8 Ω.

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Electrical Machines
Oil is provided in an oil filled transformer for

  both cooling and insulation.
  insulating.
 cooling.
 lubrication.

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 starters
 field winding
 commutator
 armature winding

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Repulsion.
  Capacitor run.
  Split phase.
  Universal.

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