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Electrical Machines

Electrical Machines
From no load to full load the slip will

None of these
 not change.
 slightly decrease.
 slightly increase.

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Electrical Machines
The application that need frequent starting and stopping is

  paper mills.
  lifts and hoists.
  blowers.
  jaw crushers.

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

 210 V.
 212 V.
  201.02 V.
 205 V.

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Electrical Machines
A motor operates in stable region at which of the following slip?

 high slip region
 low slip region
 both 1 and 2
 unity slip

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  reduces the saturation magnetization.
  increases the hysteresis loss.
  increases the electrical resistivity of iron.
None of these

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

 cast iron.
 fibre.
 mild steel.
 silicon steel.

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