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Electrical Machines

Electrical Machines
From no load to full load the slip will

 not change.
None of these
 slightly increase.
 slightly decrease.

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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

 170.
  150.
 160.
 180.

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Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

 1, 3 and 4.
 2 and 4.
  1, 2 and 3.
 2, 3 and 4.

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Electrical Machines
Which type motors are preferred for lathes?

 Either A or B.
 Squirrel Cage induction motor.
 Synchronous motor.
 DC shunt motors.

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Electrical Machines
DC machine windings are

None of these
 full pitched
 either of these
 short pitched

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Electrical Machines
The reduced air gap results in an increase

  breaking torque.
  cost of operation.
  starting torque.
  power factor.

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