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Electrical Machines

Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 45 ppm.
 20 ppm.
  35 ppm.
 25 ppm.

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Electrical Machines
A smaller air gap in a induction motor helps to

 reduce the chance of cogging.
 reduce the magnetizing current.
 reduce the chance of crawling.
 increase the starting torque.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 synchronous speed.
 normal speed.
 any of the above.
 slip speed.

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  3600 rpm.
  4000 rpm.
  3000 rpm.
  1500 rpm.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 running torque.
 efficiency.
 speed regulation.
 starting torque.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 2000 rpm
 1000 rpm
 250 rpm
 500 rpm

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MORE MCQ ON Electrical Machines

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