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Electrical Machines

Electrical Machines
Ideal value of voltage regulation of a device is?

 0
 ∞
 a finite negative value
 a positive finite value

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Electrical Machines
A DC generator beyond critical resistance will generate

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

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Draw too much current.
 Open fuse or circuit breaker.
  Develop excessive speed and damage itself.
 Produce sparking at brushes.

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 50 V.
 100 V.
  230.2 V.
 399 V.

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Electrical Machines
Tertiary winding in a transformer is mostly

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

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Electrical Machines
Open circuit in a transformer is prefered with

 rated transformer voltage
 rated transformer current
 direct current
 high frequency supply

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