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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

 radiation.
All of these
  convection.
 conduction.

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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

 Star side leads by 30°.
  Delta side lags by -30°.
 Star side lags by -30°.
 Delta side leads by 30°.

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

 4 ang 1
 2 and 2
 4 and 2
 2 and 1

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Electrical Machines
In DC machine torque is proportional to which of the following?

 armature current(Ia)
 flux(φ)
 both A and B
None of these

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Electrical Machines
Number of tappings for each equalizer ring is equal to

  number of parallel paths.
  number of commutator segments.
  number of poles.
  number of pole pairs.

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

All of these
 Capacitor run motor
 Resistance split phase motor
 Capacitor split phase motor

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