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Electrical Machines

Electrical Machines
A DC generator can be considered as

 power pump.
 prime mover.
 rectifier.
 rotating amplifier.

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Electrical Machines
During no load test, an induction motor draws power

  only for the small copper loss.
  for core loss and windage and friction loss.
  for core loss and copper loss.
  for copper loss and windage friction loss.

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Electrical Machines
The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is

 2, 3
 1, 4
 2, 4
 1, 3

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 570 A.
  460 A.
 250 A.
  340 A.

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 armature or field connections.
 shunt field connections.
 armature connections.
 series field connections.

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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

 10 Ω.
  4 Ω.
  2 Ω.
 8 Ω.

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MORE MCQ ON Electrical Machines

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