Chemical Engineering Basics MCQs

Question 1

Buoyancy force depends on the __________ the liquid.

Accepted Answer

Displaced mass of

Answer

Depth of immersion in

Answer

Surface tension of

Answer

Viscosity of

Question 2

Which one is neutral in character?

Accepted Answer

N2O

Answer

N2O4

Answer

N2O5

Answer

N2O3

Question 3

What is the effect on the performance of the economiser in the thermal power plant boiler, if the feed water temperature is very low due to preheaters being out for repairs or starving of steam supply ?

Accepted Answer

It results in corrosion due to the condensation on the flue gas side of the economiser tubes due to handling of low temperature water

Answer

Economiser tube life increases due to handling of low temperature water

Answer

Heat transfer efficiency of economiser increases due to picking up high heat from the flue gases

Answer

Scale formation rate on economiser tubes increases

Question 4

Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as

Accepted Answer

Gr0.25, Gr

Answer

Gr0.25, Gr0.33

Answer

Gr, Gr0.25

Answer

Gr0.33, Gr0.25

Question 5

__________ is the most important element, which controls the physical properties of steel.

Accepted Answer

Carbon

Answer

Manganese

Answer

Silicon

Answer

Vanadium

Question 6

Friction factor for fluid flow in pipe does not depend upon the

Accepted Answer

Pipe length

Answer

Pipe roughness

Answer

Fluid density & viscosity

Answer

Mass flow rate of fluid

Question 7

Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the

Accepted Answer

Length of the pipe

Answer

Diameter of the pipe

Answer

Density of the fluid

Answer

Velocity of the fluid

Question 8

The property of material, by which a given amount of energy is absorbed by it, without plastic deformation is called

Accepted Answer

Resilience

Answer

Toughness

Answer

Ductility

Answer

Impact strength

Question 9

Filler material used in welding having the lowest melting point out of the following is

Accepted Answer

Soft solder

Answer

Aluminium

Answer

Silver solder

Answer

Brazing spelter