Related Mcqs:

1. 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)

2. 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

3. 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

4. The capacity of a gyratory crusher is ______________ that of a jaw crusher with the same gape, handling the same feed & for the same product size range.?

   A. Same as
   B. 2.5 times
   C. 5 times
   D. 10 times

5. 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

6. 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

7. Size reduction mechanism used in Jaw crushers is__________________?

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

8. 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.

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

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

10. 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.