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Electrical Machines

Electrical Machines
Eddy current loss will depends on

 Frequency
 Flux density
All of these
 Thickness

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

  600 rpm.
 3600 rpm.
 3000 rpm.
 500 rpm.

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Electrical Machines
Tertiary winding in a transformer is mostly

 zig - zag star connected.
  delta connected.
 zig - zag delta connected.
 star connected.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 more and maximum torque decreases
 less and maximum torque decreases
 less and maximum torque increases
 more and maximum torque remains constant

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

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 synchronous speed.
 slip speed.
 normal speed.
 any of the above.

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MORE MCQ ON Electrical Machines

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