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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  not run.
  run normally.
  make noise.
  get over heated.

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Electrical Machines
The field system of an alternator is usually excited

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

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

  series motor.
 cummulative compound motor.
 AC synchronous motor.
 shunt motor.

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  shunt.
  differential compounded.
  under-compounded.
  over compounded.

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Electrical Machines
An unexcited single phase synchronous motor is

 AC series motor.
  universal motor.
 reluctance motor.
 repulsion motor.

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 50 V
 20 V
 zero
 40 V

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