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Electrical Machines

Electrical Machines
Which of the following induction motor has maximum speed?

 6 pole.
  2 pole.
 4 pole.
 8 pole.

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Electrical Machines
Rotor resistance speed control is used in

 squirrel cage induction motor.
 slip ring induction motor.
 synchronous motor.
 dc shunt motor.

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Electrical Machines
In synchronous motor the torque is proportional to

 1/P²
 P²
 Power P
 1/P

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

  Kef2Kf2Bm2.
 KefKf2Bm2.
 Kef2Kf2Bm.
 Kef2KfBm2.

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Electrical Machines
A single phase, 2 KV alternator has an armature resistance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 a load 0.8 loading power factor is

 14%.
 0%.
  8.9%.
 7%.

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 1.79 Ω
 1.8 9 Ω
 2 .1 Ω
 3.1 Ω

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