A. Pole changing squirrel cage motors
B. D.C. motors with Ward-leonard con-trol
C. A.C. slip ring motors with variable resistance
D. Any of the above
Related Mcqs:
- Which of the following motors is usually preferred for kiln drives ?
A. Cascade controlled A.C. motor
B. Slip ring induction motor
C. Three phase shunt wound com-mutator motor
D. Any of the above - Which of the following drives is suitable for mines where explosive gas exists ?
A. Steam engine
B. Diesel engine
C. Battery locomotive
D. Any of the above - ________________is preferred for automatic drives?
A. Squirrel cage induction motor
B. Synchronous motors
C. Ward-Leonard controlled D.C. motors
D. Any of the above - Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators?
A. Light duty
B. Medium duty
C. Heavy duty
D. All of the above - For which of the following applications D.C. motors are still preferred ?
A. High efficiency operation
B. Reversibility
C. Variable speed drive
D. High starting torque - Which of the following motors is used for elevators ?
A. Induction motor
B. Synchronous motor
C. Capacitor start single phase motor
D. Any of the above - Which of the following is essentially needed while selecting a motor ?
A. Pulley
B. Starter
C. Foundation pedal
D. Bearings - 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 - For a motor-generator set which of the following motors will be preferred ?
A. Synchronous motor
B. Slip ring induction motor
C. Pole changing induction motor
D. Squirrel cage induction motor - 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
