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Electrical Machines
Synchronous condensers are used to
improve the power factor
All of these
improve starting torque
reduce hunting
improve the power factor
All of these
improve starting torque
reduce hunting
Answer
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Related Question
Electrical Machines
Flashing the field of DC generator means
neutralising residual magnetism.
creating residual magnetism by a DC source.
increasing flux density by adding extra turns of winding.
making the magnetic losses forces parallel.
neutralising residual magnetism.
creating residual magnetism by a DC source.
increasing flux density by adding extra turns of winding.
making the magnetic losses forces parallel.
Answer
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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is
0.95
0.87
1.06
0.96
0.95
0.87
1.06
0.96
Answer
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Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to
reactance voltage induced in the coil.
coil resistance.
armature emf.
None of these
reactance voltage induced in the coil.
coil resistance.
armature emf.
None of these
Answer
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Electrical Machines
The three point starter is used for
Shunt motor as well as compound motors.
Series motor.
Shunt, compound and series motor.
Shunt motor.
Shunt motor as well as compound motors.
Series motor.
Shunt, compound and series motor.
Shunt motor.
Answer
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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?
None of the options.
Series.
Compound.
Parallel.
None of the options.
Series.
Compound.
Parallel.
Answer
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