A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?
Correct answer: B. stator supply is not required to produce magnetic field
- A. synchronous motor has no slip
- B. stator supply is not required to produce magnetic field
- C. mechanical load on the rotor remains constant
- D. synchronous motor has large airgap
Explanation
The synchronous motor obtains its rotor magnetic field from DC excitation, so the stator does not need to supply the full magnetizing current required by an induction motor. Its excitation can therefore be adjusted to obtain unity or even leading power factor.
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_______________?