chemical engineering MCQs – Page 390

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 Review each marked answer and report any item that may be outdated or unclear.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

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

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