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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / V2
 (V2 - E2) / E2
 (E2 - V2) / E2
 (V2 - E2) / V2

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 40W
 80W
 60W
 100W

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 any of the above
 increases
 remains unaffected
 decreases

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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%
 remain unchanged
 be 12.5%
 be less than 10%

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

  8.
 1.
 2.
 4.

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Electrical Machines
What is the highest possible speed of turbo alternators?

 4000 rpm
 3000 rpm
 1500 rpm
 1000 rpm

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