Chemical Engineering Questions & Answers (Compiled from UPSC, SSC ,PSC ,IBPS previous question papers)

Radioactive solid nuclear wastes are disposed off by
high temperature incineration
pathological incineration
pyrolysis
underground burial in concrete containers.

Which of the following is not a natural source of air pollution
Volcanic cruption and lightning discharges
Biological decay of vegetable matter
Photochemical oxidation of organic matter
None of these

Which one of the following is not a main industrial heat source
Electricity
Smoking
Chemical action
None of these

Accidents in chemical plants are mostly due to
faulty operating procedures
improper layout of the equipment
failure of equipment
inadequate equipment design

Which of the following processes is involved in the biochemical treatment of sewage effluents
Oxidation
Reduction
Dehydration
Hydrogenation

Freshwater carrying pipelines in chemical industries are coloured with
green
brown
yellow
red

Which of the following is the most lethal water pollutant
Phenol and cyanide.
Chlorine
Alkalis
Suspended solids.

In water chemical treatment plant, use of chloramines ensures
disinfection
taste and odour control
weed control in reservoirs
removal of permanent hardness

Both liquid fire and gaseous fire can be extinguished by
water gas extinguishers
mechanical foam extinguishers
carbon dioxide extinguishers
all of these

Chemical foam extinguishers are applicable only for
solid fire
liquid fire
gaseous fire
all of these

Correct use of 'factor of safety' is very important in equipment design. It is defined as the ratio of the
ultimate stress to breaking stress
ultimate stress to working stress
working stress to ultimate stress
none of these

Fault free analysis is an effective tool to identify
the system failure which results in loss
the potential of malfunction of the equipment
the areas of concentration of loss producing events
none of these

Radioactive substances present in the polluted water stream can be removed by
biological treatment
coagulation & filtration
adsorption in ion-exchange materials
all of these

Match List I relating health hazards correctly with List II and select your answer using the codes given below :

List I List II

a) Irritant 1. CO₂

b) Asphyxiant 2. Chlorine

c) Lung damage 3. Lead

d) systemic poison 4. Dust
A-4, B-3, C-2, D-1
A-2, B-1, C-4, D-3
A-2, B-4, C-1, D-3
none of these

Which is not a chemical coagulant
Aluminium sulphate
Ferrous sulphate
Hydrated lime
None of these

The expansion of term "HAZOP" is
Hazard operation
Hazard operability studies
Hazard zone
None of these

The rate of drying during constant-rate period
is unaffected by the air humidity
increases with increased air humidity
decreases with increased air humidity
increases linearly with increase in air humidity

Match List I correctly with List II and select your answer using the codes given below :

List I	List II
a) Underwood's equation	1. Number of real trays
b) Fenske's equation	2. Column diameter
c) Gilliland's equation	3. Minimum number of ideal trays
d) Vapour velocity at flooding	4. Actual number of ideal trays
	5. Actual number of ideal trays
	6. Tray efficiency

The most economical range of absorption factor is
0 to 0.5
0 to 3
1.25 to 2
5 to 15

If the selectivity of the solvent used in liquid-liquid extraction is unity
any degree of separation of solute is possible
only little amount of solute may be seperated
no separation is possible
none of these

Flooding in a column results due to
high pressure drop
low pressure drop
low velocity of the liquid
high velocity of the liquid

The equipment frequently used for adiabatic humidification operation with recirculating liquid is
natural draft cooling tower
induced draft cooling tower
spray chamber
none of these

Humidification involves mass transfer between a pure liquid phase and a fixed gas which is
insoluble in the liquid
soluble in the liquid
non-ideal in nature
at a fixed temperature

Absorption accompanied by heat evolution results in
increased capacity of the absorber
increase in equilibrium solubility
decrease in equilibrium solubility
none of these

HETP is numerically equal to HTU only when operating line
lies below the equilibrium line
lies above the equilibrium line
is parallel to equilibrium lines
is far from the equilibrium lines.

Match List I correctly with List II and select your answer using the codes given below :

List I List II

a) Distillation 1. Solvent

b) Absorption 2. Heat

c) Adsorption 3. Absorbent

d) Ion exchange 4. Resin
A-2, B-1, C-3, D-4
A-3, B-1, C-2, D-4
A-4, B-3, C-2, D-1
A-2, B-4, C-1, D-3

Constant rate period is that drying period during which
the rate of vaporization per units of drying surface area is constant
the rate of vaporization continually decreases with time.
the rate of vaporization continually increases with time
the moisture content of the substance remains constant

Minimum number of ideal stages are required in a fractionating column when the reflux ratio is equal to
minimum reflux ratio
optimum reflux ratio
zero
infinity

Higher hold up of the solid in the rotary drier results in
increased drying action
poor exposure of the solid to the gas
an increase in power required for operating the drier
all of these

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