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Electrical Machines

Electrical Machines
Belt conveyors offer _______________ starting torque.

  low.
  high.
  zero.
  medium.

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  DC series motor.
  Synchronous motor.
  AC slip ring motor.
  Single phase induction motor.

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 DC.
 A modulated supply frequency AC voltage with slip frequency envelop.
 AC of supply frequency.
  DC of slip frequency.

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 1/V²
 V²
 supply voltage V
 1/V

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Electrical Machines
The armature MMF waveform of a DC machine is

  pulsating.
  triangular.
  sinusoidal.
  rectangular.

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

  270.
 180.
 45.
 30.

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