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Electrical Machines

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

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

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Electrical Machines
The starting resistance of DC motor is generally

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

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 more than 220 V
 220 V
 somewhat less than 220 V
 6 V

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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

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

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 768 V
 192 V
 96 V
 384 V

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Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  speed.
  air gap flux.
  magnetizing current.
  power factor.

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