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Electrical Machines

Electrical Machines
Transformer cooling and insulating oil must be of

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

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt = Ea + Ia(ra + rs)
 Vt= Ea– Iara
 Vt = Ea + Iara+ ILrs
 Vt= Ea + Iara

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Electrical Machines
Field weakening method is also called as-----------?

 constant torque control
 constant power control
 constant current control
 constant voltage control

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  Slip ring induction motor.
  Synchronous motor.
  Stepper motor.
  DC differential compound motor.

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Electrical Machines
Commonly used starters of cage motor is

  star delta.
None of these
  DOL.
  both A and B.

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Electrical Machines
Voltage regulation of transformer is given by

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

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