Chemical Engineering Mcqs

A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from ______________ ppm?

• (A)  1000 to 2000
• (B)  3000 to 6000
• (C)  6000 to 9000
• (D)  10000 to 100000

Answer

Submitted By :Ali Uppal

Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about ______________ decibels?

• (A)  75
• (B)  95
• (C)  120
• (D)  140

Answer

Submitted By :Ali Uppal

Main pollutant present in automobile exhaust is_________________?

• (A)  CO
• (B)  CO2
• (C)  NO
• (D)  Hydrocarbons

Answer

Submitted By :Ali Uppal

Scale formation in boiler is controlled by____________________?

• (A)  Preheating of feed water
• (B)  Reduction in hardness, silica & alumina in feed water
• (C)  Keeping the pH value of feed water just below 7
• (D)  Eliminating H2S in feed water

Answer

Submitted By :Ali Uppal

Noise level heard at a distance of about 100 metres from a jet engine with after burner is about _____________ decibels?

• (A)  120
• (B)  140
• (C)  170
• (D)  200

Answer

Submitted By :Ali Uppal

Presence of bacteria in potable (drinking) water causes_________________?

• (A)  Turbidity
• (B)  Disease
• (C)  Bad odour
• (D)  Bad taste & colour

Answer

Submitted By :Ali Uppal

TLV of ozone (O3) and phosgene (COCl2) in air is _______________ ppm?

• (A)  0.1
• (B)  25
• (C)  100
• (D)  1000

Answer

Submitted By :Ali Uppal

Radioactive substances present in the polluted water stream can be removed by_________________?

• (A)  Biological oxygen treatment
• (B)  Coagulation and filtration
• (C)  Adsorption in ion exchange materials
• (D)  None of these

Answer

Submitted By :Ali Uppal

H2S present in gaseous stream can be removed by adsorption on _____________________?

• (A)  Silica gel
• (B)  Active carbon
• (C)  Bog iron
• (D)  Limestone powder

Answer

Submitted By :Ali Uppal

Maximum permissible turbidity in potable water is _____________ ppm?

• (A)  1
• (B)  10
• (C)  250
• (D)  1000

Answer

Submitted By :Ali Uppal