Rittinger's crushing law states that

A Work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product
B Work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product
C Work required in crushing is proportional to the new surface created
D For a given machine and feed, crushing efficiency is dependent on the size of the feed & product

Correct Answer: Work required in crushing is proportional to the new surface created

Bissoy MCQ
#Chemical Engineering #Mechanical Operations

Related Questions

For crushing of solids, the Rittinger's law states that the work required for crushing is proportional to
A The new surface created
B The size reduction ratio
C The change in volume due to crushing
D None of these
What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
A 16°
B 32°
C 40°
D 46°
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
The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the
A Feed material
B Type of crushing machine
C Both A & B
D Neither A nor B
Bond crushing law
A calls for relatively less energy for the smaller product particles than does the Rittinger's law
B is less realistic in estimating the power requirements of commercial crushers
C states that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product
D states that the work required for the crushing is proportional to the new surface created
The work index in Bond's law for crushing of solids has the following dimensions
A No units (dimensionless)
B kWh/ton
C kW/ton
D $${\text{kWh}}.{{\text{m}}^{\frac{1}{2}}}/{\text{ton}}$$
For long columns, the value of buckling load is __________ crushing load.
A Equal to
B Less than
C More than
D None of these
Crushing strength of a first class brick should not be less than
A 3.5 N/mm2
B 7.0 N/mm2
C 10.5 N/mm2
D 14.0 N/mm2
Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.
A 1.5-2
B 3.5-4.5
C 7-9
D 12-14
Which of the following is used for primary crushing of very hard lumpy materials?
A Toothed roll crusher
B Gyratory crusher
C Ball mill
D Tube mill

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