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Electrical Machines

Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 2KW
 3KW
 1.5KW
 0.5Kw

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Electrical Machines
In shapers and slotters which motor are preferred?

  Synchronous motor.
  Slip ring IM.
  Squirrel cage IM.
  Double cage motor.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The external resistance to be added in the armature circuit to limit the armature current to 125% of its rated value is

 15.1 Ω
 31.9 Ω
 15.9 Ω
 31.1 Ω

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

None of these
  3.33 %.
 3 %.
 0 .001 %.

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 induction motor.
 synchronous motor.
  induction generator.
 synchronous generator.

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Electrical Machines
In double cage induction motor, the outer cage offers

  high resistance and low reactance.
  low resistance and high reactance.
  low resistance and low reactance.
  high resistance and high reactance.

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