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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

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

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 open fuse or circuit breaker.
 develop excessive speed and damage itself.
 draw too much current.
 produce sparking at brushes.

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Electrical Machines
Belt conveyors offer _______________ starting torque.

  medium.
  zero.
  low.
  high.

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Capacitor run.
  Universal.
  Split phase.
  Repulsion.

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Electrical Machines
The field system of an alternator is usually excited

  230 V AC.
  250 / 250 V DC.
  3 - Φ, 50 Hz and 400 V.
  110 / 220 V AC.

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Electrical Machines
Series generators are used in which of the following applications?

All of these
 Arc welding.
 Air crafts.
 Used as boosters in dc distribution or transmission.

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