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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  phosphor bronze.
  carbon.
  aluminium.

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 windage and friction loss
 Copper loss
 core loss only
 both 1 and 2

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

 be unpredictable.
 increase
 decrease.
 remain the same.

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 induction motor.
  induction generator.
 synchronous motor.
 synchronous generator.

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the motor may not start.
 the starting torque becomes low.
 the starting current will be enormously high.
 the motor may run away.

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Electrical Machines
Which type of motors are used for lathes?

 Synchronous motor.
 Either A or B.
 DC shunt motors.
 Cage induction motor.

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