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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?
None of these.
Can't be determined.
15 N.
20 N.
None of these.
Can't be determined.
15 N.
20 N.
Answer
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Related Question
Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?
Demagnetization
None of these
Cross magnetization
Magnetization
Demagnetization
None of these
Cross magnetization
Magnetization
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 flux waveform is improved with reduction in harmonics
the interpoles produce additional flux to augment the developed torque
a counter-emf is induced in the coil undergoing commutation
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
the interpoles produce additional flux to augment the developed torque
a counter-emf is induced in the coil undergoing commutation
the inequality of air-gap flux on the top and bottom halves of the armature is removed
Answer
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Electrical Machines
Synchronising power of a synchronous motor varies
inversely as 1/Xs
All of these
directly as synchronous reactances Xs
directly as Xs2
inversely as 1/Xs
All of these
directly as synchronous reactances Xs
directly as Xs2
Answer
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Electrical Machines
Which of the following statements is/are correct statements?
EMF per turn in HV winding is more than EMF per turn in LV winding
EMF per turn in HV winding is less than EMF per turn in LV winding
All of these
EMF per turn in both the windings are equal
EMF per turn in HV winding is more than EMF per turn in LV winding
EMF per turn in HV winding is less than EMF per turn in LV winding
All of these
EMF per turn in both the windings are equal
Answer
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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?
Star side leads by 30°.
Delta side lags by -30°.
Star side lags by -30°.
Delta side leads by 30°.
Star side leads by 30°.
Delta side lags by -30°.
Star side lags by -30°.
Delta side leads by 30°.
Answer
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