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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 70° to 85°
 0°
 25° to 30°

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Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  None of them.
  Shunt.
  Series.
  Compound.

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Electrical Machines
In a DC compound motor the field regulator is provided to

 control the field flux.
 limit the armature current.
 control the armature flux.
 demagnetize the field partially.

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Electrical Machines
Equalizer rings are used in which of the followings?

None of these
 wave winding
 lap winding
 both 1 and 2

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Electrical Machines
Under commutation results in

  sparking the trailing edge of the brush.
  no sparking.
  sparking at the leading edge of the brush.
  sparking at the middle of the brush.

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 40 V.
 60 V.
 90 V.
 30 V.

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MORE MCQ ON Electrical Machines

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