Chemical Engineering Mcqs

_____________ mills are termed as impactors?

(A) Hammer
(B) Cage
(C) Rolling-compression
(D) None of these

Submitted By :Ali Uppal

For coarse reduction of hard solids, use ____________________?

(A) Impact
(B) Attrition
(C) Compression
(D) Cutting

Submitted By :Ali Uppal

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

Submitted By :Ali Uppal

______________ mill is not a revolving mill ?

(A) Pebble
(B) Compartment
(C) Cage
(D) Tube

Submitted By :Ali Uppal

Soft & non-abrasive materials can be made into fines by________________________?

(A) Attrition
(B) Compression
(C) Cutting
(D) None of these

Submitted By :Ali Uppal

Which is a secondary crusher for a hard & tough stone ?

(A) Jaw crusher
(B) Cone crusher
(C) Impact crusher
(D) Toothed roll crusher

Submitted By :Ali Uppal

_______________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals?

(A) Separation efficiency
(B) Selectivity index
(C) Concentration ratio
(D) None of these

Submitted By :Ali Uppal

Ball mill is used for__________________?

(A) Crushing
(B) Coarse grinding
(C) Fine grinding
(D) Attrition

Submitted By :Ali Uppal

During washing of filter at the end of constant pressure filtration, the rate of washing equals the rate of filtration___________________?

(A) At time zero
(B) At the end of filtration
(C) When half the filtrate has been obtained
(D) At the end of filtration, but decreases with time subsequently

Submitted By :Ali Uppal

Paddle agitator_________________?

(A) Is suitable for mixing low viscosity liquids
(B) Produces axial flow
(C) Moves at very high speed
(D) None of these

Submitted By :Ali Uppal

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