Synchronous Motors MCQ Questions & Answers | Electrical Engineering

A. Stator flux

B. Pull in torque

C. Both (A) and (B)

D. None of the above

A. the motor stops

B. it runs as a reluctance motor at the same speed

C. it runs as a reluctance motor at a lower speed

D. none of the above

A. decrease both armature current and power factor

B. decrease armature current but increase power factor

C. increase armature current but decrease power factor

D. increase both its armature current and power factor

A. the synchronous speed

B. less than synchronous speed

C. more than synchronous speed

D. none of the above

A. lagging power factor only

B. leading power factor only

C. unity power factor only

D. lagging, leading and unity power factors

A. small induction motor

B. D.C. series motor

C. D.C. shunt motor

D. double winding A.C./D.C. motor

A. the rotor excitation only

B. the supply voltage only

C. the rotor excitation and supply volt-age both

D. the rotor excitation, supply voltage and maximum value of coupling angle (90°)

A. Of reducing number of slip rings on the rotor

B. Armature is associated with large power as compared to the field circuits

C. Of difficulty of providing high voltage insulation on rotor

D. All of the above reasons

A. direcly proportional to the synchronous reactance

B. inversely proportional to the synchronous reactance

C. equal to the synchronous reactance

D. none of the above

A. remain same

B. go down

C. improve

D. none of the above