Size reduction of _____________ is accomplished in steam heated rollers and roll crushers?

Related Mcqs:

1. 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.

2. 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

3. Size reduction mechanism used in Jaw crushers is__________________?

   A. Attrition
   B. Compression
   C. Cutting
   D. Impact

4. 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

5. Size reduction of ice and gypsum can be accomplished suitably by a _______________ crusher?

   A. Blake jaw
   B. Toothed roll
   C. Gyratory
   D. None of these

6. 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

7. 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)

8. The term ‘angle of nip’ is concerned with the operation of the ____________ crushers?

   A. Jaw
   B. Roll
   C. Gyratory
   D. None of these

9. 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

10. Crushing of mineral particles is accomplished in a ‘cage mill’, when one or more alloy steel bars are revolved in opposite directions. It is a type of ______________ mill?

    A. Impact
    B. Roll
    C. Vibratory
    D. None of these