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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

 90°.
 about 115°.
 0°.
  about 75°.

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Electrical Machines
The principle of dynamically induced emf is utilized in

 choke.
 generator.
 transformer.
 thermocouple.

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply frequency
None of these
 rotor resistance
 supply voltage

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Electrical Machines
Capacitor start capacitor run provides

  none.
  high staring torque and high power factor.
  high staring torque only.
  high power factor only.

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  375 to 500.
  500 to 720.
  1440 to 2880.
  720 to 920.

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 8 KW.
  2 KW.
 0.
 10 KW.

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MORE MCQ ON Electrical Machines

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