Related Questions

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
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 $$\frac{{{\text{L}}.{\text{S}}}}{{0.087}}$$
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
Rittinger's number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger's number of a material indicates its
A Easier grindability
B Poor grindability
C High power consumption in grinding
D None of these
Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the
A State or manner of application of the crushing force
B Ultimate strength of the material
C Elastic constant of the material
D All of the above
Energy requirement (per unit mass of material crushed/ground) is highest for
A Jaw crusher
B Rod mill
C Ball mill
D Fluid energy mill
The crushed material received for separation is called feed or
A Tailing
B Heading
C Concentrate
D Middling
In case of a hammer crusher, the
A Feed may be highly abrasive (Moh's scale >5)
B Minimum product size is 3 mm
C Maximum feed size may be 50 mm
D Rotor shaft carrying hammers can be vertical or horizontal
During size reduction by a jaw crusher, the energy consumed decreases with the
A Decreasing size of product at constant size of feed
B Decreasing machine capacity
C Increasing size of feed at constant reduction ratio
D None of these
In a roll crusher, both the rolls
A Have the same diameter
B Are rotated towards each other
C Run either at the same or different speeds
D All of the above

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