A. water pumps
B. jaw crushers
C. centrifugal blowers
D. none of the above
Related Mcqs:
- 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 - _________________method of starting a three phase induction motor needs six terminals ?
A. Star-delta
B. Resistance starting
C. Auto-transformer
D. None of the above - The cost of an induction motor will increase as________________?
A. horsepower rating increases but r.p.m. decreases
B. horsepower rating decreases but r.p.m. increases
C. horsepower rating and operating speed increases
D. horsepower rating and operating speed decreases - ________________ motor is a constant speed motor?
A. Synchronous motor
B. Schrage motor
C. Induction motor
D. Universal motor - In squirrel cage induction motors which of the following methods of starting cannot be used ?
A. Resistance in rotor circuit
B. Resistance in stator circuit
C. Auto-transformer starting
D. Star-delta starting - In ________________ method of staging three phase induction motors the starting voltage is not reduced?
A. auto-transformer
B. star-delta
C. slip ring
D. any of the above - For three-phase induction motors which of the following is the least efficient method of speed control ?
A. Cascade control
B. Pole changing
C. Rheostat control
D. Combination of cascade and pole changing - The practical illustration of the phenomenon of mutual induction is____________?
A. A.C generator
B. D.C dynamo
C. induction coil
D. transformer - 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 - 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
