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.Management Sciences
Category: Industrial Drives
________________ 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
___________________has least range of speed control?
A. Slip ring induction motor
B. Synchronous motor
C. D.C. shunt motor
D. Schrage motor
Which feature, while selecting a.motor for centrifugal pump, will be of least significance ?
A. Starting characteristics
B. Operating speed
C. Horse power
D. Speed control
The size of an excavator is usually expressed in terms of_________________?
A. ‘crowd’ motion
B. angle of swing
C. cubic metres
D. travel in metres
Rotor of a motor is usually supported on ___________________ bearings?
A. ball or roller
B. needle
C. bush
D. thrust
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