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Electrical Machines

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

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

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 Heavy sparking at brushes.
 Both of above.
 Heavy sparking at the first stud of starting resistance steps.
 None of these.

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Electrical Machines
Two transformers operating in parallel will share the load depending on their

 per unit impedance
 leakage reactance
 efficiency
 ratings

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 Cummulative compound.
 Series shunt.
 have an equal number of electrons and protons.
  Differentical compound.

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 1, 2, 5
 1, 3, 5
 2, 3, 4
 1, 2, 3, 4

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

  Capacitor type induction motors.
  AC slip ring IM.
  Reluctance motor.
  DC series motor.

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