Chemical Engineering Basics MCQs

Question 1

In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is

Accepted Answer

Less

Answer

More

Answer

Equal

Answer

Unpredictable

Question 2

In inventory control theory, the economic order quantity (EOQ) is the

Accepted Answer

Optimum lot size

Answer

Lot size corresponding to break even analysis

Answer

Average level of inventory

Answer

None of these

Question 3

Gross & Net calorific values will be the same for

Accepted Answer

Carbon monoxide

Answer

Methane

Answer

Propane

Answer

Hydrogen

Question 4

Which of the following has the highest modulus of elasticity (about 7 × 106 kg/cm2)?

Accepted Answer

Tungsten carbide

Answer

High speed steel

Answer

Stainless steel

Answer

Superalloys

Question 5

Pick out the correct statement.

Accepted Answer

The elastic behaviour of rubber under compression is the same as its behaviour under tension

Answer

Materials exhibiting high elasticity obey Hooke's law

Answer

The damping capacity of a material is due to its plastic deformation

Answer

The stress required to cause plastic flow in polycrystalline material is higher as compared to monocrystalline materials due to the presence of grains of different orientations

Question 6

Pick out the correct statement.

Accepted Answer

Tempering of a material improves ductility & toughness but reducess hardness & brittlenes

Answer

Hot worked materials are subjected to annealing to remove internal stresses

Answer

Annealing of steel hardens it slightly

Answer

Normalising of a material induces stresses

Question 7

Pick out the correct statement.

Accepted Answer

Sodium hydroxide is both a base and an alkali

Answer

A base is always soluble in water

Answer

Hydrogen is released whenever a metal reacts with an acid

Answer

All of the above

Question 8

Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of

Accepted Answer

Glass wood

Answer

Steel

Answer

Copper

Answer

Fireclay bricks

Question 9

Addition of silicon to aluminium improves its

Accepted Answer

Castability

Answer

Corrosion resistance

Answer

Machinability

Answer

None of these