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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

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

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of rotor resistance.
  Change of number of pole.
  Change of supply voltage.
  Change of supply frequency.

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Electrical Machines
Short circuiting is caused in the armature winding due to

  any of above.
 failure of insulation between two commutator bars.
  failure of insulation between two turns of coil.
  grounding of two or more turns of the same coil.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

 800 Amp.
  0.5 Amp.
  400 Amp.
 320 Amp.

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Electrical Machines
Universal motors are used in

 cranes
All of these
 food processing
 traction

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Electrical Machines
The working principle of transformer depends on

 Amperes law.
 Faradays law of electromagnetic induction.
 Newtons law.
 Coulombs law.

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