Related Mcqs:

1. According to Taggart’s rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than_______________?

   A. 0.00184
   B. 0.0184
   C. 0.184
   D. 1.84

2. Capacity (in tons/hr) of jaw/gyratory crusher is equal to (where, L = length of the receiving opening, cm S = greater width of the discharge opening, cm) ?

   A. 0.01 L.S
   B. 0.087 L.S
   C. L.S
   D. L.S/0.087

3. 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)

4. 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

5. The material is crushed in a gyratory crusher by the action of__________________?

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

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. 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

8. Which of the following is not a part of the Blake jaw crusher ?

   A. Hanger
   B. Check plates
   C. Toggles
   D. Pitman

9. Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation ?

   A. Check plates
   B. Jaw plates
   C. Toggles
   D. Crush shaft

10. Choke crushing (in case of a Jaw crusher) compared to free crushing__________________?

    A. Results in increased capacity
    B. Consumes less power
    C. Consumes more power
    D. Both A. and C.