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Electrical Machines

Electrical Machines
Belt conveyors offer _______________ starting torque.

  zero.
  medium.
  low.
  high.

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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.
 160.
  150.
 180.

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  sR2 = X2.
  R2 = s2X2.
  R2 = sX2.
  R2 = s2X2.

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 flat-topped
 sinusoidal
 co- sinusoidal
 rectangular

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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

 15 %.
 50 %.
 25 %.
  10 %.

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Electrical Machines
A small air gap in poly phase induction motor helps to

 reduce chance of crawling.
 increase starting torque.
  reduce magnetizing current.
 reduce chance of cogging.

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MORE MCQ ON Electrical Machines

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