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Electrical Machines

Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 4/3.
 16/9.
 9/16.
 3/4.

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 both A and B
 shunt field
 armature circuit
 none of above

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Electrical Machines
What is the function of inter pole in DC generator?

 To serve the economical aspects.
 To get a superior commutation.
  Both option B and C.
 To neutralize the distortion of main field flux due to armature reaction.

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Armature current.
 Field flux.
 All of these.
 Applied voltage.

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 all of these.
 high filed circuit resistance.
 zero or very low voltage supply.
 over load.

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very high.
 Very low.
 Normal.
 Zero.

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