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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 30°.
 120°.
 90°.
 60°.

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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

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

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 48.0%.
 59.2%.
 57.1%.
 88.8%.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 75 rpm
 1500 rpm
 375 rpm
 3000 rpm

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Electrical Machines
The primary and secondary windings of a transformer are

 mechanically linked.
  inductively linked.
 electrically linked.
  conductively linked.

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Electrical Machines
In DC machine yoke offers

 mechanical protection to the machine
 produce working flux
 both A and B
 flux path completion

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