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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.02
 0.2
 0.4
 0.04

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Electrical Machines
Number of tappings for each equalizer ring is equal to

  number of parallel paths.
  number of commutator segments.
  number of poles.
  number of pole pairs.

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Electrical Machines
Slot wedges in a dc machine is made up of

 fibre.
 cast iron.
 silicon steel.
 mild steel.

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 all of above.
 high maintenance cost.
 high initial cost.
 poor overall efficiency.

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 36.36% decrease
 18.18% increase
 36.36% increase
 36.36% increase

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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then

 the speed of motor will be reduced.
 the motor will come to stop.
 the motor will attain dangerously high speed.
 the armature current will reduce.

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