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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?
2.
data provided is insufficient.
4.
6.
2.
data provided is insufficient.
4.
6.
Answer
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Related Question
Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is
1200 A.
2400 A.
600 A.
3600 A.
1200 A.
2400 A.
600 A.
3600 A.
Answer
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Electrical Machines
Ratio of starting torque to full load torque is minimum in
Series motor.
Differential compound motor.
Shunt motor.
Cumulative compound motor.
Series motor.
Differential compound motor.
Shunt motor.
Cumulative compound motor.
Answer
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Electrical Machines
The introduction of interpoles in between the main poles improves the performance of a dc machine, because
the interpoles produce additional flux to augment the developed torque
the inequality of air-gap flux on the top and bottom halves of the armature is removed
the flux waveform is improved with reduction in harmonics
a counter-emf is induced in the coil undergoing commutation
the interpoles produce additional flux to augment the developed torque
the inequality of air-gap flux on the top and bottom halves of the armature is removed
the flux waveform is improved with reduction in harmonics
a counter-emf is induced in the coil undergoing commutation
Answer
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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are
high maintenance cost.
all of above.
high initial cost.
poor overall efficiency.
high maintenance cost.
all of above.
high initial cost.
poor overall efficiency.
Answer
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Electrical Machines
The output voltage of a DC generator is
E = V – IaRa.
E = V + IaRa.
E = V + Ia.
E = V + Ra.
E = V – IaRa.
E = V + IaRa.
E = V + Ia.
E = V + Ra.
Answer
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