A. Unsuitable for heavy duty starting
B. Torque varies as armature current
C. Torque-armature current is a straight line
D. Torque is zero for zero armature current
Related Mcqs:
- ________________ motor is a constant speed motor?
A. Synchronous motor
B. Schrage motor
C. Induction motor
D. Universal motor - A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is____________________?
A. slop speed operation
B. high starting torque
C. low windage losses
D. all of the above - The selection of an electric motor for any application depends on which of the following factors ?
A. Electrical characteristics
B. Mechanical characteristics
C. Size and rating of motors
D. Cost
E. All of the above - For blowers which of the following motor is preferred ?
A. D.C. series motor
B. D.C. shunt motor
C. Squirrel cage induction motor
D. Wound rotor induction motor - In which of the following applications the load on motor changes in cyclic order ?
A. Electric shovels
B. Cranes
C. Rolling mills
D. All of the above - A pony motor is used for the starting which of the following motors ?
A. Squirel cage induction motor
B. Schrage motor
C. Synchronous motor
D. None of the above - In series motor which of the following methods can be used for changing the flux per pole ?
A. Tapped field control
B. Diverter field control
C. Series-parallel control
D. Any of the above - The diameter of the rotor shaft for an electric motor depends on which of the following ?
A. r.p.m. only
B. Horse power only
C. Horse power and r.p.m.
D. Horse power, r.p.m. and power factor - For which of the following applications motor has to start with high acceleration ?
A. Oil expeller
B. Floor mill
C. Lifts and hoists
D. Centrifugal pump - While selecting motor for an air conditioner which of the following characteristics is of great importance ?
A. Type of bearings
B. Type of enclosure
C. Noise
D. Arrangement for power transmis¬sion
E. None of the above
