Chemical Engineering Basics MCQs

Question 1

Presence of nickel & chromium in steel does not raise its

Accepted Answer

Elastic limit

Answer

Machining properties

Answer

Ductility

Answer

Resilience

Question 2

Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode

Accepted Answer

All of the above

Answer

Occurs higher in the electro-chemical series of metals

Answer

Is exemplified by magnesium plate

Answer

Is much cheaper than the cathodic base material to be guarded against corrosion

Question 3

In fluid flow and heat & mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (θ) and thermal diffusivity (α). The units of these quantities are

Accepted Answer

α and θ have units of m2/s, while μ has unit of m/s

Answer

μ, α and θ all have units of m/s

Answer

μ, α and θ all have units of m2/s

Answer

α and θ have units of m/s, while μ has unit of m2/s

Question 4

Fluorine is not a constituent of

Accepted Answer

Chloroform

Answer

Freon

Answer

Teflon

Answer

Fluorocarbons

Question 5

Superheated vapour behaves like

Accepted Answer

Gas approximately

Answer

Dry steam

Answer

An ordinary vapor

Answer

None of these

Question 6

In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the

Accepted Answer

Both A & B

Answer

Range is 15°F

Answer

Approach is 10°F

Answer

Neither A nor B

Question 7

Change in volume of metals from absolute zero temperature to their melting points is

Accepted Answer

Almost same for all metals

Answer

Different for different metals

Answer

Less for low melting point metals

Answer

Less for high melting point metals

Question 8

The most serious manufacturing defect from fracture toughness point of view is

Accepted Answer

Crack

Answer

Surface roughness

Answer

Pores

Answer

Spherical inclusion

Question 9

Unit of surface tension in S.I. unit is

Accepted Answer

Joule/m2

Answer

Watt/m

Answer

Newton/m2

Answer

Joule/m