Chemical Engineering Basics MCQs

Question 1

The lightest non-inflammable gas is

Accepted Answer

He

Answer

H 2

Answer

Ar

Answer

O 2

Question 2

Unit of surface tension in S.I. unit is

Accepted Answer

Joule/m 2

Answer

Watt/m

Answer

Newton/m 2

Answer

Joule/m

Question 3

For the Stoke's law to be valid in the case of a falling sphere in a fluid, the Reynolds number (based on sphere diameter) should be

Accepted Answer

Sphere must be metallic

Answer

< 1

Answer

Flow around the sphere should be in turbulent region

Answer

Fluid density should be constant

Question 4

The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x 0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)

Accepted Answer

X 0.8

Answer

X 1.5

Answer

X -1.5

Answer

X -0.8

Question 5

Resistance of an electrical conductor is proportional to its (where, L = length and A = cross-sectional area of the conductor)

Accepted Answer

Both A & B

Answer

A

Answer

L

Answer

A 2

Question 6

Slight displacement of a floating body in liquid makes it to oscillate about its

Accepted Answer

Metacentre

Answer

Centre of pressure

Answer

Centre of gravity

Answer

Centre of pressure

Question 7

Boiler draught of 10 mm water column is equivalent to

Accepted Answer

10 kgf/m 2

Answer

1 kgf/m 2

Answer

10 kgf/mm 2

Answer

1 kgf/mm 2

Question 8

The thermodynamic law, PV y = constant, is not followed by the

Accepted Answer

Free expansion of an ideal gas

Answer

Adiabatic expansion of steam in turbine

Answer

Adiabatic compression of air

Answer

Ideal compression of air

Question 9

The tensile strength of plastics ranges from __________ kg/mm².

Accepted Answer

0.1 to 10

Answer

10 to 50

Answer

50 to 100

Answer

0.01 to 0.1