A. Ratio of feed opening to discharge opening
B. Ratio of discharge opening to feed opening
C. Determining factor for minimum dia of the feed and the product
D. None of these
Related Mcqs:
- Toothed roll crushers achieve size reduction by___________________?
A. Tearing (shear) and compression
B. Impact and attrition
C. Both A. & B.
D. Neither A. nor B. - Size reduction of _____________ is accomplished in steam heated rollers and roll crushers?
A. Resins
B. Gums
C. Hard rubber
D. Waxes - Size reduction mechanism used in Jaw crushers is__________________?
A. Attrition
B. Compression
C. Cutting
D. Impact - Gyratory crushers compared to the reciprocating jaw crushers__________________?
A. Have greater capacity per unit of discharge area
B. Crush intermittently
C. Are less suitable for coarse materials
D. Have less steady power consumption - As per Taggart’s formula, the capacity (kg/hr) of Jaw & Gyratory crushers (for gapes of 10 to 60 cms) is equal to (where, L = Length of feed opening, cms S = Maximum width of discharge opening, cms) ?
A. LS
B. 93 LS
C. 250 LS
D. √(LS) - Pick out the wrong statement pertaining to the roll crushers?
A. Maximum feed size determines the required roll diameter
B. For hard material’s crushing, the reduction ratio should not exceed 4
C. Both the rolls run necessarily at the same speed
D. Reduction ratio and differential roll speed affect production rate & energy consumed per unit
of surface produced - The term ‘angle of nip’ is concerned with the operation of the ____________ crushers?
A. Jaw
B. Roll
C. Gyratory
D. None of these - Which of the following crushers can be considered as a combination of a jaw crusher and a roller crusher ?
A. Rod mill
B. Fluid energy mill
C. Gyratory crusher
D. Ball mill - The reduction ratio for grinders is defined as (where, Df and Dp are average diameters of feed and product respectively) ?
A. Df/Dp
B. Dp/Df
C. Df – Dp
D. None of these - The reduction ratio for fine grinders is_____________?
A. 5-10
B. 10-20
C. 20-40
D. As high as 100
