chemical engineering MCQs – Page 388

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 Review each marked answer and report any item that may be outdated or unclear.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

7741. Pick out the wrong statement ?
0

A. Refractories used for lining electrical furnaces should ordinarily have very low electrical

B. Electrical conductivity of porous refractory material is low

C. ctrical insulators

D. naces</strong>

E. ductivity

F. Electrical conductivity of refractory is not important, when these are to be used in electrical

7742. Ostwald charts are meant for__________________?
0

A. Computing the excess/deficiency of combustion air

B. None of these

C. Computation of flue gas analysis

D. Calculation of flue gas temperature

7743. Triple superphosphate which contains about 46% P2O5 is produced by the reaction of phosphate rock with ortho phosphoric acid of_____________ percent concentration?
0

A. 25-28

B. 75-80

C. > 98

D. 52-54

7744. Noise pollution level in a chemical plant is expressed in __________________?
0

A. Roentgen

B. Hertz

C. Decibel

D. None of these

7745. H4P2O7 is the chemical formula of _____________ phosphoric acid?
0

A. Ortho

B. Pyro

C. Meta

D. None of these

7746. Though liquid ammonia itself is a fertiliser (with 82% nitrogen content) yet it is commonly not used as such in a tropical country like India, because it___________________?
0

A. Vaporises at normal temperature

B. Is toxic and highly corrosive

C. Has a pungent smell

D. Is in short supply

7747. Urea is represented as______________________?
0

A. NH2.CO.NH2

B. NH.CO2.NH

C. NH3.CO2.NH3

D. NH3CO.CH3

7748. Phosphoric acid is produced in wet process from phosphate rock and____________________?
0

A. Concentrated HCl

B. Dilute H2SO4

C. Concentrated H2SO4

D. Concentrated NHO3

7749. Ammonium sulphate fertiliser is __________________?
0

A. The highest concentration nitrogenous fertiliser

B. A basic fertiliser

C. The best fertiliser for paddy

D. A neutral fertiliser

7750. There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant ?
0

A. Lead

B. Aluminium

C. Mercury

D. Arsenic

7751. Which of the following is not a commercially used feed-stock for the production of ammonia synthesis gas ?
0

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?
0

A. Endothermic

B. Exothermic

C. Catalytic

D. Reversible

7753. NPK fertiliser is a _______________ fertiliser?
0

A. Phosphatic

B. Mixed

C. Complex

D. Nitrogenous

7754. The function of an economiser in a boiler is to preheat the _____________________?
0

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______________________?
0

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 ?
0

A. 94

B. 10

C. 46

D. 80

7757. P2O5 content in superphosphate is about _____________ percent?
0

A. 15-20

B. 30-35

C. 85-90

D. 65-70

7758. Chemical formula of biuret is_________________?
0

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__________________?
0

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 ______________________?
0

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

Previous Next

Showing 7741 to 7760 of 8709 mcqs