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Electrical Machines

Electrical Machines
Which of the following will vary the maximum torque?

 rotor reactance X
None of these
 rotor resistance R
 both 1 and 2

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 Full load speed.
 Full load torque.
 None of these.
  Full load current.

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Electrical Machines
If the field winding connection of DC shunt motor is changed

 motor will not run.
 It will run in same direction.
  It will run in opposite direction.
 motor will become slow.

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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/2*ωm
 ωe = P*ωm
 ωe = ωm

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 18°
 30°
 72°
 36°

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Electrical Machines
Armature reaction in DC generators will result in

 reduction in generated emf.
 increase in slip.
 open circuit.
 short circuit.

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MORE MCQ ON Electrical Machines

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