A. Jaw
B. Roll
C. Gyratory
D. None of these
Related Mcqs:
- Angle of nip of the crushing rolls does not depend upon the_______________?
A. Diameter of the rolls
B. Speed of the rolls
C. Product size
D. Feed size - Which of the following relationships between co-efficient of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?
A. μ > tan α
B. μ ≥ tan α
C. μ > tan 2α
D. μ ≤ tan α - Half the angle of nip, (α), for a roll crusher is given by (where, dr, dp and df are diameters of crushing rolls, feed particles and rolls gap respectively) ?
A. cos α = (dr + dp)/(dr + df)
B. cos α = (dr + df)/(dr + dp)
C. tan α = (dr + dp)/(dr + df)
D. sin α = (dr + dp)/(dr + df) - What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
A. 16°
B. 32°
C. 40°
D. 46° - The value of ‘angle of nip’ is generally about__________________?
A. 16°
B. 32°
C. 52°
D. 64° - 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. - 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 - Size reduction of _____________ is accomplished in steam heated rollers and roll crushers?
A. Resins
B. Gums
C. Hard rubber
D. Waxes - 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 - Reduction ratio of crushers is the___________________?
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
