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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / E2
 (E2 - V2) / E2
 (V2 - E2) / V2
 (E2 - V2) / V2

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 constant supply voltage V, starting torque Tst decreases
None of these
 either of these
 constant V, Tst increases

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Electrical Machines
The function of field regulator in a DC compound motor is to

 none of above.
 vary the armature resistance.
 control field current.
 limit the armature current.

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Electrical Machines
Damper winding is used to

 both 1 and 2.
 increase the load current.
 decrease the load current.
 suppress the hunting.

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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

 0.
  2 KW.
 10 KW.
 8 KW.

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 back to back test
 OC and SC tests
None of these
 load test

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