Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for___________________?
(A) Conversion of CO into CO2 in the second compartment
(B) Conversion of NOx into N2 and NH3 in the first compartment
(C) Oxidation of unburnt hydrocarbon fuel in the second compartment
(D) All
Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about ______________ decibels?
(A) 20
(B) 60
(C) 90
(D) 120
Smoke is produced due to__________________?
(A) Insufficient supply of combustion air and insufficient time for combustion
(B) Poor quality of fuel and improper mixing of fuel & combustion air
(C) Poor design & overloading of furnace
(D) All
Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ?
(A) NOx
(B) Hg
(C) SO2
(D) F
80% less than 200 mesh size particles are called____________________?
(A) Smoke
(B) Powder
(C) Grit
(D) Aggregates
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
Exposure to chemicals having carcinogenic properties cause ____________________?
(A) Dermatitis (skin disorder)
(B) Cancer
(C) Asphyxiation (suffocation)
(D) Asthma
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is _____________ decibels?
(A) 35
(B) 75
(C) 95
(D) 105
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
‘Pneumoconiosis’ is a disease caused by the inhalation of ______________ dust?
(A) Coal
(B) Uranium ore
(C) Iron ore
(D) Lime