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Electrical Machines

Electrical Machines
Armature reaction in dc motor results

  open circuit.
  decrease in speed.
  short circuit.
  increase in speed.

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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?

 1.5KW
 0.5Kw
 2KW
 3KW

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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

 4.
  12.
 7.
 3.

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

  1.5 to 2.
 2 to 3.
 1.0.
 3 to 5.

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Electrical Machines
DC series motor is best suited for electric traction as

  It develops high starting torque.
 It consume less power.
 It runs at very high speed at light load.
 It is cheaper in cost.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 5 Hz
 1 Hz
 50 Hz
 0 Hz

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