Latest New Chemical Engineering MCQs – Competitive Chemical Environmental Engineering MCQs
This post is comprising of latest ” Chemical Environmental Engineering MCQs – Latest Competitive Chemical Engineering MCQs “. Here you’ll get latest chemical engineering mcqs for written test, interview with answers. If you want to improve your knowledge regarding chemical engineering then read these mcqs of Design of Steel Structures.
Latest Chemical Engineering MCQs
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Latest Chemical Environmental Engineering Mcqs
The most occurred mcqs of Chemical Environmental Engineering in past papers. Past papers of Chemical Environmental Engineering Mcqs. Past papers of Chemical Environmental Engineering Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Chemical Environmental Engineering Mcqs. The Important series of Chemical Environmental Engineering Mcqs are given below:
Methyl isocyanate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of ______________ toxic gas?
A. Highly
B. Moderately
C. Extremely
D. Very extremely
Carbonaceous particles having size less than 1 μm are called___________________?
A. Aggregates
B. Grit
C. Aerosols
D. Smoke
Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre) ?
A. Biological oxidation pond
B. Activated carbon adsorption
C. Lagooning
D. Chemical coagulation
Which of the following pollutants, if present in atmosphere is detectable by its odour ?
A. NO2
B. SO2
C. CO
D. CO2
Removal of ______________ is accomplished by aeration of water?
A. Dissolved gases
B. Dissolved solids
C. Suspended solids
D. None of these
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal ?
A. In vacuum filter
B. In sedimentation tanks equipped with mechanical scrapper
C. By chemical coagulation
D. In clarifiers
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called__________________?
A. Grit
B. Powder
C. Dust
D. Smoke
Inhalation of silica dust causes a disease called__________________?
A. Pneumoconiosis
B. Silicosis
C. Bronchitis
D. None of these
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________________?
A. Lagoons
B. Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)
C. Biological oxygen pond
D. Filtration
A shallow pond in which the sewage is retained and biologically treated is called__________________?
A. Oxidation
B. Lagoon
C. Imhoff tank
D. Skimming tank
Main pollutants released from iron & steel industry is__________________?
A. CO, CO2 & SO2
B. CO2, H2S & NO2
C. H2S, NO & SO3
D. SO3, NO2 & CO2
Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan_________________?
A. Of increased diameter
B. With greater number of blades
C. Both A. & B.
D. Neither A. nor B.
The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is_________________?
A. Boundary layer separation
B. Cavitation
C. Pipe vibrations
D. Fluctuation in liquid flow
Dust collection efficiency of a cyclone separator depends upon its______________?
A. Inlet gas velocity
B. Diameter
C. Overall height
D. All A., B. & C.
Which of the following is the most severe air pollutant ?
A. SO2
B. NOx
C. Hydrocarbons
D. CO
In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C ?
A. t = 15 – 0.0065h
B. t = 0.0035h -15
C. t = 15 + 0.0065h
D. t = 15 – 0.0035h
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the __________________?
A. Oxygen ion concentration
B. Relative stability
C. Biological oxygen demand (BOD)
D. Bacterial stability factor
Persons working in cement plants and limestone quarries are more prone to disease like__________________?
A. Asthma
B. Cancer
C. Silicosis
D. Fluorosis (bone disease)
Presence of soluble organics in polluted water causes_________________?
A. Fire hazards
B. Depletion of oxygen
C. Undesirable plants growth
D. Explosion hazards
Presence of iron and manganese in water causes___________________?
A. Temporary hardness
B. Discoloration of bathroom fixtures
C. Reduction in its dissolved oxygen content
D. None of these
TLV of mercury in potable (drinking) water is about ______________ ppm?
A. 0.001
B. 1
C. 0.1
D. 5
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in____________________?
A. Oxidation of carbonaceous matter to CO2
B. Coagulation and flocculation of colloids
C. Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter to the nitrite and eventually to the nitrate
D. All A., B. and C.
Presence of a certain minimum quantity of fluorine is desirable in potable water to prevent___________________?
A. Dental cavities
B. Water-borne disease
C. Scale formation
D. Corrosion
Chemical Process Mcqs
Pick out the wrong statement. A. Caustic embrittlement of boiler’s metallic parts is caused by high concentration of caustic soda in boiler feed water___________________?
B. Cooling and freezing of water kills the bacteria present in it
C. Dissolved oxygen content in high pressure boiler feed water should be nil
D. With increasing boiler operating pressure of steam, the maximum allowable concentration of silica in feed water goes on decreasing
Foul odour and bad taste of water is removed by treating with__________________?
A. Bleaching powder
B. Alum
C. Activated carbon
D. Copper sulphate
World environment day is observed every year on the 5th of___________________?
A. June
B. July
C. December
D. September
Smoke is produced due to__________________?
A. Poor design & overloading of furnace
B. Poor quality of fuel and improper mixing of fuel & combustion air
C. Insufficient supply of combustion air and insufficient time for combustion
D. All A., B. and C.
Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about ______________ decibels?
A. 60
B. 20
C. 90
D. 120
Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for___________________?
A. Conversion of NOx into N2 and NH3 in the first compartment
B. Conversion of CO into CO2 in the second compartment
C. Oxidation of unburnt hydrocarbon fuel in the second compartment
D. All A., B. and C.
The widest explosive limit is of _____________, thereby making it the most explosive gas?
A. Acetylene
B. Hydrogen
C. Petrol vapor
D. Carbon monoxide
Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause___________________?
A. Explosion
B. Undesirable plant growth
C. Non biodegradable foam
D. Corrosion
Green house effect is accentuated by________________?
A. Rapid industrialisation
B. Deforestation
C. Increased transportation activity
D. All A., B. and C.
Operating principle of cyclone separator is based on the action of _______________ dust particles?
A. Gravitational force on
B. Centrifugal force on
C. Diffusion of
D. Electrostatic force on
Peroxyacetyl nitrate (PAN), a pollutant is found in the_________________?
A. Automobile exhaust
B. Exhaust of nitric acid plant
C. Flue gas of coal based power plant
D. Exhaust of sulphuric acid plant
Lagooning process is mainly a means of the__________________?
A. Sludge disposal
B. Biological treatment of wastes
C. Reduction of excessive flow in sewers
D. None of these
Siderosis is a disease caused by the inhalation of ______________ dust?
A. Silica
B. Coal
C. Iron
D. None of these
Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about ______________ decibels?
A. 120
B. 95
C. 75
D. 140
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from ______________ ppm?
A. 3000 to 6000
B. 1000 to 2000
C. 6000 to 9000
D. 10000 to 100000
‘Pneumoconiosis’ is a disease caused by the inhalation of ______________ dust?
A. Coal
B. Uranium ore
C. Iron ore
D. Lime
COD of raw municipal sewage may be in the range of about _____________ mg/litre?
A. 5-10
B. 1-2
C. 90-120
D. 1500-2500
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is _____________ decibels?
A. 95
B. 75
C. 35
D. 105
Exposure to chemicals having carcinogenic properties cause ____________________?
A. Asthma
B. Cancer
C. Asphyxiation (suffocation)
D. Dermatitis (skin disorder)
Thermodynamics Mcqs
World’s worst radioactive pollution was caused by nuclear reactor disaster which occured in ___________________?
A. Pennsylvania (U.S.A.)
B. Chernobyl (undivided U.S.S.R.)
C. Arizona (U.S.A.)
D. Moscow (U.S.S.R.)
High noise level in a chemical plant can be controlled by the_________________?
A. Path control of noise
B. Suppression of noise at the source itself
C. Protection of operating personnel
D. All A., B. & C.
80% less than 200 mesh size particles are called____________________?
A. Grit
B. Powder
C. Smoke
D. Aggregates
Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ?
A. Hg
B. NOx
C. SO2
D. F
Higher concentration of CO2 in atmosphere_____________________?
A. Reflects and absorbs the longer wavelength (infra-red) radiations
B. Allows visible solar radiation (ultraviolet) of short wave-length to pass through
C. Prevents solar heat being radiated out completely, resulting in ‘heat trap’ i.e., global warming
D. All A., B. and C.
Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes__________________?
A. Anaemia
B. Blood poisoning
C. Nervous system disorder
D. All A., B. & C.
Maximum permissible turbidity in potable water is _____________ ppm?
A. 250
B. 10
C. 1
D. 1000
H2S present in gaseous stream can be removed by adsorption on _____________________?
A. Active carbon
B. Silica gel
C. Bog iron
D. Limestone powder
Radioactive substances present in the polluted water stream can be removed by_________________?
A. Coagulation and filtration
B. Biological oxygen treatment
C. Adsorption in ion exchange materials
D. None of these
TLV of ozone (O3) and phosgene (COCl2) in air is _______________ ppm?
A. 0.1
B. 100
C. 25
D. 1000
Presence of bacteria in potable (drinking) water causes_________________?
A. Bad odour
B. Disease
C. Turbidity
D. Bad taste & colour
Noise level heard at a distance of about 100 metres from a jet engine with after burner is about _____________ decibels?
A. 140
B. 120
C. 170
D. 200
Scale formation in boiler is controlled by____________________?
A. Eliminating H2S in feed water
B. Reduction in hardness, silica & alumina in feed water
C. Keeping the pH value of feed water just below 7
D. Preheating of feed water
Main pollutant present in automobile exhaust is_________________?
A. CO
B. NO
C. CO2
D. Hydrocarbons
Pollution by particulate matter emission in the atmosphere does not take place during metal____________________?
A. Machining
B. Grinding
C. Cutting
D. Polishing
Arsenic pollutant is not generated in _______________ industries?
A. Glass & ceramic
B. Tanneries
C. Beverages
D. Any of these
The pH value of oxidised sewage is about_____________________?
A. 6.2
B. 1.8
C. 7.3
D. 13.4
Growth of ______________ is promoted by the presence of manganese in water?
A. Algae
B. Files
C. Micro-organisms
D. Mosquitoes
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxiate is ≥ _____________ percent?
A. 84
B. 80
C. 88
D. 92
Radioactive solid nuclear wastes are disposed off by _________________?
A. Pathological incineration
B. High temperature incineration
C. Pyrolysis
D. Underground burial in concrete containers