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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  simple in construction.
  all of below.
  less maintenance.
  less cost.

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Electrical Machines
The commutator segments of DC machines are made up of

 hard-drawn copper
 copper alloy
 copper
 brass

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Electrical Machines
Armature reaction of an unsaturated DC machine is

  crossmagnetising.
  none of above.
 demagnetising.
  magnetising.

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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

 16.55 Nm
 15.6 Nm
 15.28 Nm
 15.92 Nm

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  reduces inter poles flux density.
  reduces generator emf.
  results in sparking trouble.
  increases armature speed.

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 run at normal speed.
 run at lower speed.
 not run.
 burn.

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