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Electrical Machines

Electrical Machines
Slot wedges in a dc machine is made up of

 fibre.
 silicon steel.
 cast iron.
 mild steel.

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Electrical Machines
Flux density under trailing pole tips in case of generator will

None of these
 decrease
 either increase or decrease
 increase

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Electrical Machines
Wave winding is employed in DC machine of

 high current and low voltage rating.
  low current and high voltage rating.
 high current and low voltage rating.
 low current and low voltage rating.

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Electrical Machines
Which of the following motor used in hair dryers?

  Split phase IM.
  Shaded pole IM.
  Cage induction motor.
  Synchronous motors.

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Electrical Machines
In field flux method speed control of DC Motor is

 constant torque drive below the base speed.
 constant torque drive above the base speed.
 constant hp drive below the base speed.
 constant power drive above base speed.

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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be

None of these
 steady and unidirectional
 oscillating
 pulsating and unidirectional

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