Interpole flux should be sufficient to_____________?
Correct answer: C. neutralise both the armature reaction flux as well as commutating e.m.f. induced in the coil
- A. neutralise the commutating self induced e.m.f.
- B. neutralise the armature reaction flux
- C. neutralise both the armature reaction flux as well as commutating e.m.f. induced in the coil
- D. perform none of the above functions
Explanation
Interpoles produce a commutating flux that opposes the armature-reaction flux in the commutation zone and induces a reversing emf to cancel the coil's reactance or self-induced emf. Thus, both functions are required for sparkless commutation.
Last updated
Practise Electrical Machines
1,061 free Electrical Machines MCQs from Electrical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Electrical Engineering questions like this
Electrical Engineering is on 2 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
5 H.P., 50-Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest ?
A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be_____________?
A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be____________?
A 3-phase induction motor delta connected is carrying too heavy load and one of its fuses blows out. Then the motor______________?
A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor_______________?