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Electrical Machines

Electrical Machines
At slip s = 1 torque developed in machine is

  none.
  electromagnetic torque.
  starting torque.
  maximum torque.

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1203
 1080
 1200
 1000

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Electrical Machines
Open circuit test on transformer gives

 both 1and 2
 copper loss
 hysteresis loss
 eddy current loss

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

  30 %.
 5 %.
  2.67 %.
 1.5 %.

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  of low resistivity.
  cheaper in cost.
  easy to cast owing to its low melting point and is easily available.
  lighter in weight.

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Supply voltage.
  Armature voltage.
  Armature current.
  Field excitaion.

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