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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

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

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
 MNA
 either GNA or MNA
None of these

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Electrical Machines
The use of higher flux density in the transformer design

 reduces the weigh per KVA
 has no relation with the weight of transformer
None of these
 increases the weigh per KVA

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Eddy current losses
 Friction and windage losses
 All of the them
 Hysteresis losses

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve and the speed falls.
 deteriorate and the speed falls.
 improve and the speed rises.
 deteriorate and the speed rises.

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.8.
  1.
 0.4.
 0.6.

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