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Electrical Machines

Electrical Machines
Slip exists in

  induction motor.
  synchronous motor.
  in both machines.
  none of above.

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 2
 3 or 4
 0
 1

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 I/Ia2
 Ia2
 1/Ia
 Ia

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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

 18.25%.
 15.30%.
 16.67%.
 14.28%.

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Electrical Machines
Lamination of core are generally made of

 stainless steel.
 cast iron.
 carbon.
 silicon steel.

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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

 31.1 Ω
 15.1 Ω
 15.9 Ω
 31.9 Ω

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