chemical engineering Mcqs
7751. Which of the following is not a commercially used feed-stock for the production of ammonia synthesis gas ?
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A. Water

B. Coal/coke oven gas

C. Naphtha

D. Tar
7752. Formation of ammonium carbamate by reaction of NH3 with CO2 is a/an ______________ reaction?
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A. Endothermic

B. Exothermic

C. Catalytic

D. Reversible

7753. NPK fertiliser is a _______________ fertiliser?
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A. Phosphatic

B. Mixed

C. Complex

D. Nitrogenous

7754. The function of an economiser in a boiler is to preheat the _____________________?
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A. Pulverised coal

B. Feedwater

C. Combustion air

D. Furnace oil

7755. The composition of fresh feed to the high temperature, high pressure urea autoclave is______________________?
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A. Excess liquid ammonia and compressed CO2 gas

B. Excess liquid ammonia and liquefied CO2

C. Compressed ammonia gas and excess compressed CO2

D. Liquid ammonia and excess compressed CO2

7756. Nitrogen content of urea is about _____________ percent ?
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A. 94

B. 10

C. 46

D. 80

7757. P2O5 content in superphosphate is about _____________ percent?
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A. 15-20

B. 30-35

C. 85-90

D. 65-70

7758. Chemical formula of biuret is_________________?
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A. NH4COONH2

B. NH2CONHCONH2

C. NH2.CO.NH2

D. NH3.COO.NH3

7759. Excessive use of chemical fertilisers causes shrivelling of the roots and wilting of the plant, because the__________________?
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A. Osmotic pressure of the soil water becomes less than that of the plant sap

B. Soil becomes too acidic

C. Soil becomes too alkaline

D. Osmotic pressure of the soil water becomes higher than that of the plant sap
7760. Smog is ______________________?
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A. A liquid particle resulting from vapor condensation

B. A solid particle e.g. fly-ash

C. A combination of smoke and fog

D. Nothing but black smoke

7761. Fuel economy in an industrial furnace operation cannot be achieved by the use of__________________?
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A. Non-preheated combustion air

B. Recuperators

C. Stoichiometric combustion air

D. Combustion air not enriched with oxygen

7762. Coal based fertiliser plants at Ramagundam (Andhra Pradesh) and Talcher (Orissa) ?
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A. Use coal for heating purpose

B. Gasify coal to get hydrogen from coal gas

C. Use coal as conditioner in fertiliser

D. Use coal as filler in fertiliser

7763. Reaction of phosphate rock with 98% H2SO4 produces ______________________?
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A. None of these

B. White phosphorous

C. Superphosphate

D. Ortho-phosphoric acid
7764. Which of the following is the costliest source of hydrogen needed for ammonia manufacture under Indian condition _______________?
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A. Steam reforming of naphtha

B. Natural gas cracking

C. Electrolysis of water

D. Cryogenic removal of H2 from coke oven gas

7765. Nitrolime is chemically known as____________________?
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A. Calcium nitrate

B. Ammonium nitrate

C. None of these

D. Calcium ammonium nitrate (CAN)
7766. Which of the following is not a natural source of air pollution ?
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A. Volcanic eruptions and lightening discharges

B. None of these

C. Photochemical oxidation of organic matter

D. Biological decay of vegetable matter

7767. Pick out the wrong statement ?
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A. Red phosphorous is the most reactive allotropic form of phosphorous

B. sphorous by vaporisation followed by condensation

C. Red phosphorous, which is used in the manufacture of safety matches, is converted into white

D. Green acid is the other name of phosphoric acid produced by the reaction of phosphate rock

E. Chemically unreactive nature of red phosphorous is due to its polymeric structure

F. p; sulphuric acid

7768. Temperature and pressure in ammonia converter is_________________?
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A. 200 atm, 1000C

B. 450 atm, 550C

C. 450 atm, 1000C

D. 450 atm, 200C

7769. Color test of water is done with an instrument called__________________?
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A. Electro-chemical cell

B. Colorimeter

C. Turbidimeter

D. Tintometer
7770. Radioactive solid nuclear wastes are disposed off by _________________?
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A. Underground burial in concrete containers

B. High temperature incineration

C. Pyrolysis

D. Pathological incineration

7771. Which of the following is not a source of ozone emission in the atmosphere?
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A. Xerox machines

B. Dermatological photo-therapy equipments

C. Refrigerators

D. High voltage electrical equipments

7772. 80% less than 200 mesh size particles are called____________________?
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A. Powder

B. Smoke

C. Grit

D. Aggregates

7773. H2S present in gaseous stream can be removed by adsorption on _____________________?
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A. Limestone powder

B. Active carbon

C. Bog iron

D. Silica gel

7774. Which of the following is an adsorbent used for the removal of SO2 from gas/air ?
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A. Limestone powder or alkalised alumina

B. Silica gel

C. Active carbon

D. Bog iron

7775. Persons working in cement plants and limestone quarries are more prone to disease like__________________?
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A. Silicosis

B. Cancer

C. Asthma

D. Fluorosis (bone disease)

7776. Sulphur dioxide present in the industrial chimney exhaust gases causes____________________?
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A. Corrosion of building materials

B. Reduction in plants productivity owing to acid rain

C. All A., B. and C.

D. Respiratory & lung disease

7777. Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes________________?
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A. All A., B. and C.

B. Reduced strength of textiles

C. Corrosion, tarnishing & soiling of metals

D. Fading of dyes on textiles

7778. Which of the following acts as a natural source of air pollution ?
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A. None of these

B. Deforestation

C. Volcanic eruption

D. Forest fire

7779. Maximum permissible limit of mercury in human blood is ______________ micrograms/100 c.c?
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A. 82

B. 7

C. 1

D. 19

7780. Maximum allowable concentration of CO2 in air for safe working is _____________ ppm (parts per million)?
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A. 1000

B. 2000

C. 50

D. 5000
7781. Which of the following is the most detrimental for water used in high pressure boiler ?
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A. Phenol

B. Dissolved oxygen

C. Turbidity

D. Silica
7782. Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as________________?
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A. Polyacrylonitrile

B. Benzopyrene

C. Peroxyacetyl nitrate (PAN) or methyl nitrite

D. Photochemical smog

7783. Cv is given by__________________?
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A. (?E/?T)V

B. (?E/?P)V

C. (?E/?V)T

D. (?V/?T)P

7784. Beyond what concentration of H2S in air, acute danger to human life exists ?
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A. 100 ppm

B. 50 ppm

C. 300 ppm

D. 700 ppm
7785. Tolerable limit of nitrogen oxides in air is _____________ ppm?
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A. 5

B. 0.1

C. 25

D. 1

7786. Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about ______________ decibels?
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A. 120

B. 90

C. 20

D. 60

7787. Thermal pollution due to excessive heat & temperature in the working place causes__________________?
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A. Reduction in working efficiency of manpower

B. All A., B. & C.

C. Fatigue

D. High breathing rate

7788. Which of the following is the most lethal water pollutant ?
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A. Chlorine

B. Suspended solids

C. Phenol and cyanide

D. Alkalis

7789. During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum ?
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A. Acceleration

B. Deceleration

C. Idle running

D. Cruising

7790. Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about ______________ decibels?
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A. 120

B. 180

C. 90

D. 150

7791. Presence of _____________ bacteria in water causes disease like typhoid?
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A. Pathogenic

B. Aerobic

C. Non-pathogenic

D. Anaerobic

7792. The equation relating E, P, V and T which is true for all substances under all conditions is given by (?E/?V)T = T(?P/?T)H P. This equation is called the ___________________?
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A. Redlich-Kwong equation of state

B. Thermodynamic equation of state

C. Equation of state

D. Maxwells equation

7793. A cyclic engine exchanges heat with two reservoirs maintained at 100 and 300C respectively. The maximum work (in J) that can be obtained from 1000 J of heat extracted from the hot reservoir is_________________?
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A. 349

B. 1000

C. 667

D. 651

7794. Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in___________________?
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A. Municipal sewage treatment

B. Iron & steel plant

C. Petroleum refinery

D. Food industry
7795. The widest explosive limit is of _____________, thereby making it the most explosive gas?
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A. Carbon monoxide

B. Acetylene

C. Hydrogen

D. Petrol vapor

7796. In a sedimentation tank, the detention period for water ranges from _____________ hours?
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A. 24 to 32

B. 16 to 20

C. 2 to 4

D. 8 to 12

7797. White smoke coming out of the chimney of a furnace indicates the use of_________________?
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A. Gaseous fuel in the furnace

B. Very high excess air

C. Low excess air

D. Liquid fuel in the furnace

7798. A Carnot cycle consists of the following steps ?
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A. Two isobaric and two isothermal

B. Two isothermal and two isentropic

C. Two isothermals and two isochoric

D. Two isochoric and two isobaric

7799. Higher concentration of nitrogen dioxide in atmospheric air causes___________________?
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A. Cancer

B. Asphyxiation

C. Bronchitis

D. Corrosion

7800. Peroxyacetyl nitrate (PAN), a pollutant is found in the_________________?
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A. Automobile exhaust

B. Exhaust of nitric acid plant

C. Exhaust of sulphuric acid plant

D. Flue gas of coal based power plant