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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
A synchorous generator connected to an infinite bus is over excited. Considering only the reactive power from the point view of the system the machine acts as

 A resistor.
 A capacitor.
 an inductor.
  None of these.

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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

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

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  skewing.
  slip.
  crawling.
  cogging.

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 1.06
 0.96
 0.95
 0.87

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

 either of these
 exactly opposite
None of these
 same

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MORE MCQ ON Electrical Machines

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