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Electrical Machines

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

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

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 increasing field excitation.
 shifting the brush axis from GNA to MNA.
  compensating winding and commutating poles.
 fixing the brush axis inline with the pole axis.

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Electrical Machines
Generators work on the principle of production of

 statically induced emf.
 dynamically induced emf.
None of these
 dynamically and statically induced emf.

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = 1.
  E1 / E2 = N1 / N2.
  E1 / E2 = N1kw1 / N2kw2.
  E1 / E2 = f1kw1 / f2kw2.

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 normal speed.
 more than normal speed.
 less than normal speed.
 zero.

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 run at lower speed.
 not run.
 run at normal speed.
 burn.

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