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Electrical Machines

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

 remains same.
None of these
 decreases.
 increases.

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 59.2%.
 48.0%.
 88.8%.
 57.1%.

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1500 rpm
 750 rpm
 3000 rpm
 1000 rpm

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 700 W
 600 W
 625 W
 650 W

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

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

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Electrical Machines
Alternator operates on the principle of

  mutual induction.
  self or mutual induction.
  self induction.
  electromagnetic induction.

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