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.Management Sciences
Category: Chemical Environmental Engineering
Maximum permissible limit of mercury in human blood is ______________ micrograms/100 c.c?
0
A. 1
B. 7
C. 19
D. 82
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 A., B. & C.
H2S present in gaseous stream can be removed by adsorption on _____________________?
A. Silica gel
B. Active carbon
C. Bog iron
D. Limestone powder
Which of the following is an adsorbent for removal of nitrogen oxides from gas/air ?
A. Active carbon
B. Silica gel
C. Bog iron (iron oxide)
D. Pulverised limestone
Water filtration rate in a rapid sand filter ranges from ______________ kilolitres/m2/hr?
A. 0.1 to 1
B. 3 to 6
C. 10 to 15
D. 15 to 20
High noise level in a chemical plant can be controlled by the_________________?
A. Suppression of noise at the source itself
B. Path control of noise
C. Protection of operating personnel
D. All A., B. & C.
COD of raw municipal sewage may be in the range of about _____________ mg/litre?
A. 1-2
B. 5-10
C. 90-120
D. 1500-2500
Fluorosis is caused due to the presence of excessive amount of ______________ in drinking water?
A. Mercury
B. Lead
C. Fluoride
D. Arsenic
Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid flow control. It is caused due to_________________?
A. Reynold stresses
B. Shear forces
C. Both A. & B.
D. Neither A. nor B.
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