Chemical Engineering Basics MCQs

Question 1

Reynolds number of a fluid flowing in a circular pipe is 10000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ?

Accepted Answer

9100

Answer

13000

Answer

7000

Answer

2550

Question 2

Which of the following is an acidic constituent of B.F. slag?

Accepted Answer

SiO2

Answer

FeO

Answer

MgO

Answer

CaO

Question 3

Dielectric . . . . . . . .

Accepted Answer

Is an electrical insulating material

Answer

Of low resistivity is preferred

Answer

Should have high thermal conductivity

Answer

Need not defy the corrosive action of chemicals

Question 4

Largest application of laser welding is in __________ welding.

Accepted Answer

Microspot

Answer

Under water

Answer

Precious metals

Answer

Heavy structure

Question 5

Nitriding of steel is a process for

Accepted Answer

Case hardening

Answer

Spheroidising

Answer

Normalising

Answer

Annealing

Question 6

A dense structure of grinding wheel is not used for the

Accepted Answer

Ductile material

Answer

Hard materials

Answer

Brittle materials

Answer

Finishing cuts

Question 7

The hardness of a grinding wheel is specified by the

Accepted Answer

Alphabetical letter

Answer

Rockwell hardness number

Answer

Brinell hardness number

Answer

None of these

Question 8

Addition of silicon to cast iron

Accepted Answer

Increases the fluidity of molten metal

Answer

Promotes graphite module formation

Answer

Improves its ductility

Answer

Does not promote graphite flakes formation

Question 9

X-rays do not exhibit the property of

Accepted Answer

Scattering

Answer

Reflection

Answer

Diffraction

Answer

Dispersion