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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

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

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 reduced by 10%
 increased by 10%
 reduced by 20%
 increased by 20%

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 direction of motion of the conductor.
 direction of flux.
 direction of induced emf.
 opposite to the direction of motion of the conductor.

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 50 Hz
 48 Hz
 45 HZ
 48.5 Hz

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Electrical Machines
Select the motor that should not be started on no load?

 Compound motor.
 Shunt motor.
  Series motor.
 Brushless DC motor.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  increases upto a limit and then remains almost constant.
  decreases.
  remains constant.
 increases.

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