Chemical Engineering Mcqs

The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the_________________?

• (A)  Ionosphere
• (B)  Troposphere
• (C)  Stratosphere
• (D)  None of these

Answer

Submitted By :Ali Uppal

TLV of NO2 & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO2 causes_________________?

• (A)  Skin disorder
• (B)  Bronchitis
• (C)  Bone disease
• (D)  Cancer

Answer

Submitted By :Ali Uppal

Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by_________________?

• (A)  Quenching of hot coke
• (B)  Discharging in the river stream
• (C)  Filtration and recycling for cooling coke oven gas
• (D)  None of these

Answer

Submitted By :Ali Uppal

Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes_________________?

• (A)  Paralysis of muscles & loss of appetite
• (B)  Nervous depression
• (C)  Gastritis and diarrhea
• (D)  All

Answer

Submitted By :Ali Uppal

Insufficient washing of sand grains in a rapid sand filter causes__________________?

• (A)  Air binding
• (B)  Shrinkage of filtering media
• (C)  Mud balls
• (D)  Expansion of filtering media

Answer

Submitted By :Ali Uppal

In sewage treatment, the detention period allowed for oxidation ponds ranges from _____________ weeks?

• (A)  1 to 2
• (B)  4 to 5
• (C)  9 to 10
• (D)  15 to 20

Answer

Submitted By :Ali Uppal

Exposure to SO2 containing chimney gases results in the__________________?

• (A)  Reduction in strength of leather & cloth
• (B)  Acceleration of corrosion rates of metals
• (C)  Increased drying & hardening time of paints
• (D)  All

Answer

Submitted By :Ali Uppal

Higher concentration of nitrogen dioxide in atmospheric air causes___________________?

• (A)  Cancer
• (B)  Bronchitis
• (C)  Asphyxiation
• (D)  Corrosion

Answer

Submitted By :Ali Uppal

Which is the most widely used coagulant for the treatment of turbid water ?

• (A)  Alum (aluminium sulphate)
• (B)  Lime
• (C)  Ferric chloride
• (D)  Sodium aluminate

Answer

Submitted By :Ali Uppal

A man exposed to excessive noise level in the working environment may suffer from____________________?

• (A)  Hearing loss
• (B)  Rupture of ear drum
• (C)  Nervousness & fatigue
• (D)  All

Answer

Submitted By :Ali Uppal