Chem Eng Basic Concept

Question 1

The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used.

Answer 1

aluminium oxide

Question 2

Tin based white metals are used, where bearings are subjected to

Answer 2

high pressure & load.

Question 3

Friction factor for fluid flow in pipe does not depend upon the

Answer 3

pipe length.

Question 4

Chromium molybdenum steel can not be welded using __________ welding.

Answer 4

electrical resistance

Question 5

A high pressure boiler generates steam at a pressure greater than __________ kg/cm2

Answer 5

80

Question 6

Evaporative cooling process employs a combination of cooling and humidification in which the

Answer 6

sensible heat is removed and the latent heat is added.

Question 7

Annealing ofwhite cast iron produces __________ iron.

Answer 7

malleable

Question 8

Area under the stress-strain curve upto the __________ is referred to as the modulus of resilience.

Answer 8

proportional limit

Question 9

is the hardest oxide and is hence used where high wear resistance at high temperature is required.

Answer 9

Alumina

Question 10

A material in which the atoms are arranged regularly in some directions but not in others, is termed as ‘mesomorphous material’; an example of which is

Answer 10

lead

Question 11

Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.

Answer 11

grey

Question 12

In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

Answer 12

water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.

Question 13

Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography.

Answer 13

γ-rays

Question 14

Absolute zero pressure can be attained at a temperature of

Answer 14

0°R

Question 15

The product out from a cupola is called

Answer 15

cast iron

Question 16

Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by

Answer 16

treating in biological oxygen pond

Question 17

The widest explosive limit is of __________ , thereby making it the most explosive gas.

Answer 17

acetylene

Question 18

Polluted water having low BOD are most economically treated in

Answer 18

oxidation ponds

Question 19

Tri-sodium phosphate is used in boiler water treatment to reduce

Answer 19

caustic embrittlement

Question 20

The commonest form of iron & manganese found in ground water as pollutant is in the form of their

Answer 20

bi-carbonates

Question 21

80% less than 200 mesh size particles are called

Answer 21

powder

Question 22

TLV of ozone (O3) and phosgene (COCl2) in air is __________ ppm.

Answer 22

0.1

Question 23

Most of the atmospheric air pollutants are present in large quantity in

Answer 23

trophosphere

Question 24

Pneumoconiosis’ is a disease caused by the inhalation of __________ dust.

Answer 24

coal

Question 25

The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

Answer 25

relative stability.

Question 26

Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the

Answer 26

electrostatic precipitator

Question 27

The main industrial source of emission of hydrogen sulphide air pollutant is

Answer 27

coal based thermal power plants.

Question 28

Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.

Answer 28

inorganic

Question 29

Nitrogen oxides (NOx) is not produced in the __________ industry.

Answer 29

detergent

Question 30

Oil and grease present in an emulsified state in waste water discharged from industries can be removed by

Answer 30

settling out using chemical reagents.

Question 31

The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.

Answer 31

decreases

Question 32

Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of

Answer 32

Grashoff number & Prandtl number.