A. Electromagnets
B. Cams or eccentric shafts
C. Unbalanced flywheels
D. Either A., B. or C.
Related Mcqs:
- Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the ___________________?
A. Light metal powder down upto 4 mesh size
B. Dry chemicals
C. Heavy tonnages of rocks or gravel
D. Powdered food & granular materials - Vibrating screens have capacity in the range of ______________ tons/ft2 .mm mesh size?
A. 0.2 to 0.8
B. 5 to 25
C. 50 to 100
D. 100 to 250 - Trommels employ _____________ for screening of materials?
A. Fibrous cloth
B. Woven wire screen
C. Punched plate
D. None of these - Handling of ashes and similar materials can be done best by a ______________ conveyor?
A. Flight
B. Drag or slat
C. Belt
D. Ribbon - Specific surface area is the surface area of a unit _______________ of materials?
A. Weight
B. Volume
C. Either A. or B.
D. Neither A. nor B. - With increase in the capacity of screens, the screen effectiveness__________________?
A. Remains unchanged
B. Increases
C. Decreases
D. Decreases exponentially - Trommels are revolving screens which normally operate in the range of _______________ rpm?
A. 1 – 2
B. 15 – 20
C. 40 – 50
D. 60 – 75 - For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately _____________ microns?
A. 5
B. 50
C. 500
D. 5000 - Which of the following screens has the maximum capacity ?
A. Grizzlies
B. Trommels
C. Shaking screen
D. Vibrating screen - Which of the following is not an industrial screening equipment ?
A. Sharpies centrifuge
B. Vibrating screen
C. Grizzly
D. Trommel
