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Electrical Machines

Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 increase
 not changed
None of these
 decrease

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Electrical Machines
In DC machine yoke offers

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

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

 Demagnetization
 Cross magnetization
None of these
 Magnetization

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

 0.66 Ω.
 0.78 Ω.
  0.24 Ω.
 0.45 Ω.

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 5.7 kW, 8.7 kW.
  6.3 kW, 9.3 kW.
 9.3 kW, 9.3 kW.
 9.6 kW, 12 kW.

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Electrical Machines
Example of double excited machine is

 Both are correct.
 Synchronous motor.
 DC Shunt Motor
None of these

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