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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  Z.
  P and Z.
  none of these.
  P.

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Oscillate around the normal speed.
 Remain unaltered.
 Increase.
 Reduce.

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 increases.
 remains same.
None of these
 decreases.

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Electrical Machines
In DC shunt motor if load is increased, the speed

 increased slightly.
 reduce slightly.
 increase proportional.
 remains constant.

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Electrical Machines
What is the necessity of copper brushes in a dc motors?

  To increase the flux cutting by the rotor.
  None of these.
  To absorb the mechanical shocks produced during running condition.
  To convert alternating supply current to direct current.

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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

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

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