Single Phase Induction Motors MCQ Questions & Answers | Electrical Engineering

A. It cannot be reversed, ordinarily

B. It requires no D.C. field excitation for its operation

C. It is nothing else but a single-phase, salient pole synchronous-induction motor

D. Its squirrel cage-rotor is of unsym-metrical magnetic construction in order to vary reluc-tance path between stator and rotor

A. It requires more maintenance of commutator and other mechanical devices

B. It makes quite a bit of noise on starting

C. In fractional horse power motors, it has replaced the capacitor motors

D. It is not easily reversed

A. open armature winding

B. shorted armature winding

C. shorted field winding?

D. high commutator mica

E. all of the above

A. Is opposite to that of brush shift

B. Is the same as that of brush shift

C. Is independent of brush shift

D. None

A. 30 to 40

B. 70 to 80

C. 80 to 90

D. 100

A. short circuited capacitor

B. capacitor value hiving changed

C. open circuiting of capacitor

D. none of the above

A. It requires only one winding

B. It can rotate in one direction only

C. It is self-starting

D. It is not self-starting

A. It is extremely sensitive to fluctuations in supply voltage

B. Its high starting torque is due to its high rotor hysteresis loss

C. It is extremely quiet in operation

D. It accelerates from rest to full-speed almost instantaneously

A. Universal motor

B. Repulsion motor

C. Capacitor motor

D. All single phase motors have zero starting torque

A. worn bearings

B. short-circuit in the winding

C. open-circuit in the winding

D. none of the above