Chemical Engineering Basics MCQs

Question 1

A cylinderical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson's ratio of the rod is

Accepted Answer

0.44

Answer

0

Answer

0.33

Answer

0.25

Question 2

Lime contains about 90% CaO. Percentage CaO present in limestone is about

Accepted Answer

50

Answer

25

Answer

70

Answer

80

Question 3

Limestone addition in the blast furnace is done to flux __________ present in the raw materials.

Accepted Answer

SiO2

Answer

Al2O3

Answer

MnO2

Answer

P

Question 4

The most detrimental impurity in high pressure boiler feed water is

Accepted Answer

Silica

Answer

Suspended salt

Answer

Dissolved salt

Answer

Turbidity

Question 5

Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about

Accepted Answer

17 : 1

Answer

9:1

Answer

23 : 1

Answer

29 : 1

Question 6

Which of the following metals reacts violently with water ?

Accepted Answer

Sodium

Answer

Mercury

Answer

Calcium

Answer

Magnesium

Question 7

The process of removal of scale formed during hot rolling of steel is termed as

Accepted Answer

Pickling

Answer

Descaling

Answer

Shot blasting

Answer

Skimming

Question 8

Silicon crystal can be converted to p-type semi-conductor by doping with

Accepted Answer

Boron

Answer

Phosphorous

Answer

Nitrogen

Answer

Carbon

Question 9

During sensible heating of humid air

Accepted Answer

Both 'b' & 'c'

Answer

Relative humidity increases

Answer

Dew point remains constant

Answer

Dry bulb & wet bulb temperature increases