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Electrical Machines

Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  sf / 2.
  s2.
  f / s.
  sf.

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 decrease.
 remain unaltered.
 become execessively high.
 increase.

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

 0.2 lag
 0.2 lead
 0.9 lag
 unity

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Electrical Machines
Sparkless commutation can be achieved by employing

  inter poles.
 compensating winding.
  any one or more of the above methods.
  high resistance carbon brushes.

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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

 2 .1 Ω
 1.79 Ω
 3.1 Ω
 1.8 9 Ω

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 440 A.
 250 A.
 570 A.
 340 A.

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MORE MCQ ON Electrical Machines

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