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.Management Sciences
Category: Industrial Drives
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
By the use of which of the following m D.C. can be obtained from AC. ?
A. Silicon diodes
B. Mercury arc rectifier
C. Motor generator set
D. Any of the above
________________ motor is a constant speed motor?
A. Synchronous motor
B. Schrage motor
C. Induction motor
D. Universal motor
In jaw crushers a motor has to often start against ____________________ load?
A. heavy
B. medium
C. normal
D. low
The starting torque in case of centrifugal pumps is generally_________________?
A. less than running torque
B. same as running torque
C. slightly more than running torque
D. double the running torque
The travelling speed of cranes varies from_________________?
A. 20 to 30 m/s
B. 10 to 15 m/s
C. 5 to 10 m/s
D. 1 to 2.5 m/s
Which of the following is essentially needed while selecting a motor ?
A. Pulley
B. Starter
C. Foundation pedal
D. Bearings
Which of the following motors is preferred when quick speed reversal is the main consideration ?
A. Squirrel cage induction motor
B. Wound rotor induction motor
E. Synchronous motor
D. D.C. motor
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