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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  wound.
  linear.
  none of these.
  cage.

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 4/3.
 16/9.
 3/4.
 9/16.

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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
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 4575.4 r.p.m.
 1130 r.p.m.
 none of above.
 1037.5 r.p.m.

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Electrical Machines
The direction of rotation of a DC motor can be determined by

 Ampere's law.
 Lenz's law.
 Fleming's right hand rule.
  Fleming's left hand rule.

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Electrical Machines
The condition for maximum running torque is

 unity
 zero
 0.5 lagging
 R = S.X
 0.707 lagging

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