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Electrical Machines

Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 50 V.
  zero.
  220 V.
  about 2 V.

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Electrical Machines
Damper winding is used to

 increase the load current.
 both 1 and 2.
 suppress the hunting.
 decrease the load current.

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

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = 2/P*ωm
 ωe = P*ωm
 ωe = P/2*ωm
 ωe = ωm

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Electrical Machines
Which of the DC Motor use flywheel?

 Series motor.
 Differently compared motor.
 Cumulatively compound motor.
 Shunt motor.

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Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 high and low
 high and high
 low and low
 low and high

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MORE MCQ ON Electrical Machines

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