Chemical Engineering Basics MCQs

Question 1

Limestone is added in the blast furnace (during pig iron manufacture) to

Accepted Answer

Form slag by combining with impurities

Answer

Supply heat by undergoing exothermic reaction with impurities

Answer

Reduce the coke consumption

Answer

Reduce slag viscosity

Question 2

The following thermocouple may be used for measuring temperature upto 1873°K.

Accepted Answer

Platinum-platinum rhodium

Answer

Chromel-alumel

Answer

Copper-constantan

Answer

Iron-constatan

Question 3

Pick out the correct combination about the role of various additives used in polymers.

Accepted Answer

Fillers: Does not affect the property of polymer but increases its weight

Answer

Plasticiser : increases the polymer strength

Answer

Heat stabiliser : increases the maximum service temperature

Answer

Lubricants: increases the flexibility of polymers

Question 4

Which of the following does not discharge the dust collected as a dry solid?

Accepted Answer

Wet scrubber

Answer

Electrostatic precipitator

Answer

Bag filter

Answer

Gravity settling chamber

Question 5

All of the following alloying elements of steel increases hardness but sacrifice ductility, except

Accepted Answer

Nickel

Answer

Vanadium

Answer

Molybdenum

Answer

Chromium

Question 6

If the pH value of a solution of sodium chloride is 7; then what will be the pH value of the solution after its electrolysis ?

Accepted Answer

> 7

Answer

7

Answer

< 7

Answer

0

Question 7

Use of flux during soldering is done to

Accepted Answer

Prevent oxide formation

Answer

Increase flidity of solder by lowering its melting temperature

Answer

Wash away surplus solder

Answer

Full up the joint gap

Question 8

Internal energy of a gas obeying Van-Der-Wall's equation of state, $$\left( {{	ext{p}} + \frac{{	ext{a}}}{{{{	ext{v}}^2}}}} ight)\left( {{	ext{V}} - {	ext{b}}} ight) = {	ext{RT,}}$$ depends upon its

Accepted Answer

Pressure & temperature

Answer

Pressure & specific volume

Answer

Temperature & specific volume

Answer

Temperature only

Question 9

The quantity of electricity required to deposit one gm equivalent of any substance is one

Accepted Answer

Faraday

Answer

Ampere

Answer

Coulomb

Answer

Microfaraday