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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

 Low load.
 None of these.
  Full load.
 No load.

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Electrical Machines
Poles of DC machine are often laminated to

 reduce iron weight.
 dissipate more heat.
 reduce armature reaction.
 reduce pulsation loss.

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Electrical Machines
In DC generators brushes are used for

 collecting of voltage
 convert ac armature current in to dc
 collecting of current without any sparkings
 reduce eddy current loss

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Electrical Machines
A DC generator without commutator is a

 AC generator
 DC generator
 DC motor
 induction motor

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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.

 none of above
 armature circuit
 both A and B
 shunt field

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Electrical Machines
Counter emf of a DC motor

 regulates its armature voltage.
 exceeds supply voltage
 aids applied voltage.
 helps in energy conversion.

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