chemical engineering MCQs – Page 383

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
7641. NPK means a ______________ fertiliser?
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A. Liquid

B. Mixed

C. Solid

D. Potassic

7642. Conditioners like finely divided peat are added to the fertiliser to________________?
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A. Produce bulk

B. Increase its solubility

C. Counteract burning

D. Avoid caking & hardening
7643. Which of the following is a manmade source of air pollution ?
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A. Automobile exhaust

B. Bacterial action in soil and swamp areas

C. Forest fire

D. All A., B. and C.

7644. In ammonia synthesis (N2 + 3H2 = 2NH3), there is a decrease in total volume, hence to get high equilibrium conversion, the reaction should be carried out at________________?
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A. High pressure

B. Very high temperature

C. Low pressure

D. Atmospheric pressure; as the pressure has no effect on conversion

7645. ______________ is the most suitable fertiliser for paddy?
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A. Potassium nitrate

B. Ammonium sulphate

C. Urea

D. Superphosphate

7646. CO2 present in reformed gas (obtained by steam reforming of naphtha) is removed by absorbing in _________________?
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A. Mono-ethanolamine (MEA)

B. Methyl-Ethyl Ketone (MEK)

C. Ammoniacal liquor

D. Slaked lime

7647. Which of the following is not a mixed fertiliser ?
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A. None of these

B. Nitrophosphate

C. Calcium ammonium nitrate (CAN)

D. Ammonium phosphate

7648. Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about _______________ decibels?
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A. 185

B. 105

C. 135

D. 160

7649. Reaction of ______________ acid with phosphate rock produces superphosphates?
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A. Sulphuric

B. Nitric

C. Phosphoric

D. Hydrochloric

7650. Neutralisation of nitric acid with ammonia to produce ammonium nitrate is a/an _______________________ reaction?
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A. Catalytic

B. Exothermic

C. Autocatalytic

D. Endothermic

7651. Electric furnace method for production of phosphorous uses phosphate rock and _________________________?
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A. Silica and coke

B. Sulphuric acid

C. Phosphoric acid

D. Coke

7652. Fertiliser plants get their N2 requirements _____________________?
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A. By dissociating oxides of nitrogen

B. From producer gas

C. By fractionation of liquefied air

D. From coal gas (coke oven gas)

7653. Ammonium nitrate (is mixed with limestone) is not used as fertiliser as such, because______________________?
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A. It is a liquid at room temperature

B. It is hygroscopic and explosive in nature

C. It is highly acidic in nature

D. Its nitrogen content is very less

7654. Low grade phosphate rock can be used in electrical furnace, because__________________?
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A. It is cheap

B. It produces low cost product

C. Of the better CaO/SiO2 balance for slag formation

D. CaO content is less

7655. Which furnace employs preheating, heating and soaking zones ?
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A. Cupola

B. Soaking pit

C. Open hearth furnace

D. Reheating furnace
7656. Urea (a nitrogenous fertiliser) is produced from carbon dioxide and__________________?
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A. Ammonium nitrate

B. Nitric acid

C. Ammonia

D. Nitric oxide

7657. Pick out the wrong statement ?
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A. e ovens</strong>

B. Nitrogen is normally supplied in fertiliser either in Ammoniacal or the nitrate form, from

C. pared to finely divided powder form of fertiliser

D. ch the soil takes it up in the form of ammonium ions or nitrate ions and forms amino acids

E. Particle size range of a good granular fertiliser is 10-15 mesh and it contains less moisture as

F. Calcium present in the fertiliser helps in correcting the soil acidity

7658. The function of skimming tank in sewage treatment is to remove _____________ substances?
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A. Suspended solid

B. Dissolved solid

C. Gritty & inorganic

D. Oil & fatty
7659. Pick the odd man out?
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A. Briquettes

B. Oil gas

C. Wood

D. Pitch creosote mixture

7660. Heating of ortho-phosphoric acid to about 900C, produces_________________?
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A. No change in it

B. None of these

C. Meta-phosphoric acid

D. Pyrophosphoric acid