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Electrical Machines

Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lead
 0.9 lag
 0.2 lag
 unity

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 normal speed.
 more than normal speed.
 less than normal speed.
 zero.

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Electrical Machines
Which motor used in Lathe machine?

  D.C. cumulative compound motor.
  D.C . series motor.
None of these
  D.C. shunt motor.

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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

 1.8 9 Ω
 3.1 Ω
 2 .1 Ω
 1.79 Ω

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Electrical Machines
Which of the following are variable losses?

 armature copper loss
 shunt field copper loss
 eddy current loss
 hysteresis loss

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

  wound.
  linear.
  none of these.
  cage.

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