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Electrical Machines

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

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

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.04, 0.96
 0.02, 0.98
 0.04, 1.96
 0.02, 1.98

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 Separately Excited DC Motor
 Compound Wound DC Motor
 DC Series Motor
 DC Shunt Motor

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Electrical Machines
In above question, find rms line voltage for delta connection?

 399 V.
 50 V.
  230.2 V.
 100 V.

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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 slip rings.
 solid connection.
 commutator.
 none of above.

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Electrical Machines
which of the following type of brush and their application is/are correct

 carbon brush → normal ratings
All of these
 electro graphite → large ratings
 copper graphite → low voltage high current density

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