Related Questions

In jaw crushers a motor has to often start against ________ load.
A Heavy
B Medium
C Normal
D Low
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
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
Size reduction of __________ is accomplished in steam heated rollers and roll crushers.
A Resins
B Gums
C Hard rubber
D Waxes
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
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
The term 'angle of nip' is concerned with the operation of the __________ crushers.
A Jaw
B Roll
C Gyratory
D None of these
General mechanism of size reduction in intermediate and fine grinder is by
A Cutting action
B Compression
C Compression and tearing
D Impact and attrition
The mechanism of size reduction by a hammer mill is by impact and attrition between the
A Grinding element & the housing
B Feed particles
C Both A & B
D Neither A nor B
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

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