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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

 around 500 ohms.
 Infinitely large.
  Low.
 1000 ohms.

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Electrical Machines
Which machine is used for battery charging?

 None of these.
 DC shunt generator.
 Compounded DC generator.
 DC series generator.

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Increases.
 Remains unchanged.
  Decreases.
 Oscillates around the rated speed.

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 shunt generator
 both B and C
 series generators
 over compound generator

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

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

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 increasing the number of turns.
 using soft material for winding.
 using transformer oil of better quality.
 using the magnetic core of low reluctance.

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