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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

 high viscosity.
 low BDV.
 low resistivity.
  low viscosity.

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 large and thick
 large and thin
 less and thin
 less and thick

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Electrical Machines
Tertiary winding in a transformer is mostly

  delta connected.
 zig - zag delta connected.
 zig - zag star connected.
 star connected.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 4 time the initial value
 1/2 of the initial value
 1/4 of the intial value
 twice the initial value

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Electrical Machines
It is advisable to start a DC series motor with some load to

 Avoid sparking.
 Limit the flux.
 Limit the current.
  Limit the speed.

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 increase.
 decrease.
 remain unaltered.
 become execessively high.

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MORE MCQ ON Electrical Machines

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