Chemical Engineering Mcqs

For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a__________________?

• (A)  Buhrstone mill
• (B)  Ball mill
• (C)  Crushing rolls
• (D)  Hammer mill

Answer

Submitted By :Ali Uppal

_____________ is the most commonly used ‘filter aid’?

• (A)  Diatomaceous earth
• (B)  Fuller’s earth
• (C)  Vermiculite
• (D)  Semi-plastic clay

Answer

Submitted By :Ali Uppal

In case of a hammer crusher ?

• (A)  Crushing takes place by impact breaking
• (B)  Maximum acceptable feed size is 30 cms
• (C)  Reduction ratio can be varied by adjusting the distance from cage to hammers
• (D)  All

Answer

Submitted By :Ali Uppal

Screen efficiency is______________________?

• (A)  Recovery/rejection
• (B)  Recovery
• (C)  Rejection
• (D)  None of these

Answer

Submitted By :Ali Uppal

Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a ______________ conveyor?

• (A)  Flight
• (B)  Slat or drag
• (C)  Ribbon
• (D)  Screw

Answer

Submitted By :Ali Uppal

For a turbine agitated and baffled tank, operating at low Reynold’s number (based on impeller diameter), the power number (Np) varies with NRe as_________________?

• (A)  Np ∝ NRe
• (B)  Np ∝ √NRe
• (C)  Np → constant
• (D)  Np ∝ 1/NRe

Answer

Submitted By :Ali Uppal

Out of the following size reduction equipments, the maximum feed size can be accepted by the__________________?

• (A)  Tube mill
• (B)  Ball mill
• (C)  Jaw crusher
• (D)  Jet pulveriser

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of__________________?

• (A)  Bronze
• (B)  Stainless steel
• (C)  Flint or porcelain
• (D)  Concrete

Answer

Submitted By :Ali Uppal

Solid particles separation based on the difference in their flow velocities through fluids is termed as the__________________?

• (A)  Clarification
• (B)  Classification
• (C)  Elutriation
• (D)  Sedimentation

Answer

Submitted By :Ali Uppal