Chemical Engineering Mcqs

Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundries causes___________________?

(A) Asphyxiation (suffocation)
(B) Shortness of breath
(C) Tuberculosis
(D) All

Submitted By :Ali Uppal

In a sedimentation tank, the detention period for water ranges from _____________ hours?

(A) 2 to 4
(B) 8 to 12
(C) 16 to 20
(D) 24 to 32

Submitted By :Ali Uppal

Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about ____________ decibels?

(A) 3
(B) 30
(C) 7
(D) 70

Submitted By :Ali Uppal

TLV of lead for public sewer/waste water is about ______________ ppm?

(A) 1
(B) 25
(C) 150
(D) 650

Submitted By :Ali Uppal

Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes_______________?

(A) Foaming
(B) Odour nuisances
(C) Undesirable plant growth
(D) Turbidity

Submitted By :Ali Uppal

Which of the following is a secondary air pollutant ?

(A) Photochemical smog
(B) Sulphur dioxide
(C) Nitrogen dioxide
(D) Dust particles

Submitted By :Ali Uppal

Ozone is__________________?

(A) A primary pollutant
(B) A secondary pollutant
(C) Impervious to ultra-violet rays
(D) Both

Submitted By :Ali Uppal

Infective bacteria in water is killed by the _____________ process?

(A) Sterilisation
(B) Aeration
(C) Disinfection
(D) None of these

Submitted By :Ali Uppal

Hydrogen ion concentration in distilled water is___________________?

(A) 10-7
(B) 7 × 10-7
(C) 107
(D) 7 × 107

Submitted By :Ali Uppal

The progressive warming up of the earth’s surface is mainly due to the___________________?

(A) Automobile exhaust
(B) Blanketing effect of CO2 in the atmosphere
(C) De-forestation
(D) Thickening of ozone layer

Submitted By :Ali Uppal

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