In squirrel cage induction motors, the rotor slots are usually given slight skew in order to__________?
Correct answer: D. reduce magnetic hum
- A. reduce windage losses
- B. reduce eddy currents
- C. reduce accumulation of dirt and dust
- D. reduce magnetic hum
Explanation
Slightly skewed rotor slots reduce slot harmonics and the resulting magnetic pulsations, which minimises magnetic hum. Skewing also helps reduce cogging and torque pulsations, but reducing hum is the intended option here.
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_______________?