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Electrical Machines

Electrical Machines
From no load to full load the slip will

 not change.
None of these
 slightly decrease.
 slightly increase.

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Electrical Machines
The slot edges in a DC machine are made of

  Fibre.
 Silicon steel.
 Mild steel.
 Cast iron.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

  series motor.
 shunt motor.
 AC synchronous motor.
 cummulative compound motor.

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 zero
 more than 6 V
 6 V
 less than 6 V

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Electrical Machines
The flux involved in the emf equation of a transformer has

  maximum value.
 average value.
 rms value.
 total value.

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  provide starting torque only.
  prevent hunting and provide the starting torque.
  reduce noise level only.
  reduce the eddy currents.

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MORE MCQ ON Electrical Machines

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