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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be
72°
36°
30°
18°
72°
36°
30°
18°
Answer
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Related Question
Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is
0.16 pu.
0.08 pu.
0.01 pu.
0.02 pu.
0.16 pu.
0.08 pu.
0.01 pu.
0.02 pu.
Answer
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Electrical Machines
Synchronous condensers are used to
improve the power factor
reduce hunting
All of these
improve starting torque
improve the power factor
reduce hunting
All of these
improve starting torque
Answer
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Electrical Machines
In which of the following motors DC excitation is not required?
hysteresis motor
reluctance motor
3-phase synchronous motor
3-phase synchronous generator
hysteresis motor
reluctance motor
3-phase synchronous motor
3-phase synchronous generator
Answer
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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is
18.18% increase
36.36% increase
36.36% increase
36.36% decrease
18.18% increase
36.36% increase
36.36% increase
36.36% decrease
Answer
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Electrical Machines
Damper winding is used to
suppress the hunting.
both 1 and 2.
increase the load current.
decrease the load current.
suppress the hunting.
both 1 and 2.
increase the load current.
decrease the load current.
Answer
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