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 ___________________?

Related Mcqs:

1. Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of_____________________?

   A. Electromagnets
   B. Cams or eccentric shafts
   C. Unbalanced flywheels
   D. Either A., B. or C.

2. 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)

3. 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

4. Tabling process used for separating two materials of different densities by passing the dilute pulp over a table/deck, which is inclined from the horizontal surface at an angle of about________________?

   A. 1 to 2°
   B. 2 to 5°
   C. 5 to 10°
   D. 10 to 15°

5. 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

6. Trommels employ _____________ for screening of materials?

   A. Fibrous cloth
   B. Woven wire screen
   C. Punched plate
   D. None of these

7. 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

8. Trommels are revolving screens which normally operate in the range of _______________ rpm?

   A. 1 – 2
   B. 15 – 20
   C. 40 – 50
   D. 60 – 75

9. Which of the following equations is Rittinger’s crushing law? (Where P = power required by the machine, m = feed rate, k = a constant, D̅ sa & D̅ sb = volume surface mean diameter of feed & product respectively) ?

   A. P/m = K/ √Dp
   B. P/m = K . ln D̅ sa/D̅ sb
   C. P/m = K . (1/ D̅ sb – 1/D̅ sa)
   D. None of these

10. According to Bond crushing law, the work required to form particle of size ‘D’ from very large feed is (where (S/V)p and (S/V)f are surface to volume ratio of the product and feed respectively) ?

    A. (S/V)p
    B. √(S/V)p
    C. (S/V)2p
    D. (S/V)f