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Electrical Machines

Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 4 ang 1
 2 and 1
 2 and 2
 4 and 2

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Electrical Machines
The three point starter is used for

  Shunt, compound and series motor.
  Shunt motor as well as compound motors.
  Shunt motor.
  Series motor.

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Electrical Machines
If the excitation is increased, the power factor is

None of these
 unity power factor
 leading power factor
 lagging power factor

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 none of these.
  Shunt.
 Series.
 Compound (cummolative).

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Electrical Machines
Which of the following alternators contain large number of poles?

None of these
 Turbo alternators.
 Aame in both alternators.
 Hydro alternators.

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

 74 Nm.
  65.8 Nm.
 38.5 Nm.
 27.73 Nm .

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