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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/(1-S)
 S
 1/S
 1-S

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 3 point starter
All of these
 2 point starter
 4 point starter

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Electrical Machines
A DC generator beyond critical resistance will generate

 maximum power.
 maximum voltage.
 no voltage.
 maximum current.

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Electrical Machines
The frame of an induction motor is made of

  stainless steel.
  silicon steel.
  closed grained cast iron.
  aluminium.

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

 16/9.
 4/3.
 3/4.
 9/16.

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 be more than 10%
 be 12.5%
 be less than 10%
 remain unchanged

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