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.Management Sciences
Category: Industrial Drives
Light duty cranes are used in which of the following ?
A. Power houses
B. Pumping stations
C. Automobile workshops
D. All of the above
Which of the following alternatives will be cheaper ?
A. A 100 H.P. AC. three phase motor
B. Four motors of 25 H.P. each
C. Five motors of 20 H.P. each
D. Ten motors of 10 H.P. each
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
Battery operated scooter for braking uses________________?
A. plugging
B. mechanical braking
C. regenerative braking
D. rheostatic braking
Which of the following types of motor enclosure is safest ?
A. Totally enclosed
B. Totally enclosed fan cooled
C. Open type
D. Semi closed
While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance ?
A. Running characteristics
B. Starting characteristics
C. Efficiency
D. Braking
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
For derries and winches which of the following drives can be used ?
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
Flame proof motors are used in_________________?
A. paper mills
B. steel mills
C. moist atmospheres
D. explosive atmospheres
Reluctance motor is a________________?
A. variable torque motor
B. low torque variable speed motor
C. self starting type synchronous motor
D. low noise, slow speed motor
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