Chemical Engineering Mcqs

A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown below in the P-V diagram. The net work done during the complete cycle is given by the area covered by_________________?

• (A)  P1ACBP2P1
• (B)  ACBB1A1A
• (C)  ACBDA
• (D)  ADBB1A1A

Answer

Submitted By :Ali Uppal

The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by_________________?

• (A)  Biological oxygen pond
• (B)  Aerated lagoons
• (C)  Trickling filters
• (D)  Gravity separator having oil skimming devices

Answer

Submitted By :Ali Uppal

Noise emitted by a ventilation fan at a distance of 3 metres is about _____________ decibels?

• (A)  85
• (B)  105
• (C)  125
• (D)  145

Answer

Submitted By :Ali Uppal

Presence of ____________ in water stream are deleterious to aquatic life?

• (A)  Soluble and toxic organics
• (B)  Suspended solids
• (C)  Heavy metals and cyanides
• (D)  All

Answer

Submitted By :Ali Uppal

Tolerable limit of nitrogen oxides in air is _____________ ppm?

• (A)  0.1
• (B)  1
• (C)  5
• (D)  25

Answer

Submitted By :Ali Uppal

BOD of raw municipal sewage may be in the range of about _____________ mg/litre?

• (A)  1-2
• (B)  5-10
• (C)  150-300
• (D)  2000-3000

Answer

Submitted By :Ali Uppal

Iron & manganese present in the polluted water is removed by __________________?

• (A)  Simple filtration
• (B)  Oxidation followed by settling & filtration
• (C)  Chemical coagulation
• (D)  Chlorination only

Answer

Submitted By :Ali Uppal

TLV of aldrin in public water supply system is about ____________ μg/litre?

• (A)  0.5
• (B)  17
• (C)  357
• (D)  1097

Answer

Submitted By :Ali Uppal

Aerobic biological oxidation ponds used for the purification of polluted water__________________?

• (A)  Destroys/removes pathogen from the sewage
• (B)  Is not very effective for non-biodegradable substances (e.g. ABS) containing effluents
• (C)  Destroys/removes pathogen much more effectively if the sewage is chlorinated
• (D)  All

Answer

Submitted By :Ali Uppal

Presence of excess fluorine in water causes__________________?

• (A)  Dental cavity
• (B)  Tooth decay
• (C)  Fluorosis
• (D)  Respiratory disease

Answer

Submitted By :Ali Uppal