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Electrical Machines

Electrical Machines
In escalator which motor is used?

  3 - φ IM.
  DC shunt motor.
  Universal motor.
  1 - φ IM.

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Electrical Machines
For larger units high torque it is preferred to use

 Slip induction motor.
 DC shunt motor.
 Partial motor.
 Universal motor.

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 Compound Wound DC Motor
 DC Shunt Motor
 Separately Excited DC Motor
 DC Series Motor

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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

 50.
 36.
  18.
 80.

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Electrical Machines
Which type of motors are preferred in lifts?

 DC compound motors.
 DC shunt motors.
 DC series motors.
None of these

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Fleming's right hand rule.
 Lenz's law.
 Ampere law.
 Fleming's left hand rule.

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