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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

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

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

 160.
  150.
 180.
 170.

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Electrical Machines
For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with

 constant supply voltage V, starting torque Tst decreases
 either of these
None of these
 constant V, Tst increases

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Electrical Machines
The use of double squirrel cage winding on the rotor provides

 higher efficiency.
  a large starting torque.
 reduced starting torque.
 low noise.

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

None of these
 armature reaction.
  permanent magnets.
  residual magnetism.

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Electrical Machines
A synchronous motor will deliver maximum power when

  load angle is 0°.
  load angle is 45°.
  load angle is equal to internal angle θ.
  input power factor is unity.

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