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Electrical Machines

Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 2 + s.
  s.
 1 - s.
  2 - s.

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  make noise.
  run normally.
  get over heated.
  not run.

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

 Increasing the field current.
 Decreasing the field current.
 Increasing the armature current.
 Increasing the field current.

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Electrical Machines
Which machine is used for battery charging?

 DC shunt generator.
 None of these.
 DC series generator.
 Compounded DC generator.

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 back to back test
None of these
 OC and SC tests
 load test

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 1.98
 0.04, 1.96
 0.04, 0.96
 0.02, 0.98

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