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.Management Sciences
Category: Chemical Environmental Engineering
A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called___________________?
A. Cesspool
B. Lagoon
C. Skimming mill
D. Septic tank
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
Arsenic pollutant is not generated in _______________ industries?
A. Tanneries
B. Glass & ceramic
C. Beverages
D. Any of these
Noise emitted by a ventilation fan at a distance of 3 metres is about _____________ decibels?
A. 85
B. 105
C. 125
D. 145
In sewage treatment, its sedimentation is speeded up by commonly adding__________________?
A. Hydrochloric acid
B. Lime
C. Copper sulphate
D. Sodium sulphate
Hydrogen ion concentration in distilled water is___________________?
A. 10-7
B. 7 × 10-7
C. 107
D. 7 × 107
Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm) ?
A. Benzopyrene
B. Peroxyacetyl nitrate
C. Carbon monoxide
D. Sulphur dioxide
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 A., B. and C.
Ionisation potential employed in the industrial electrostatic precipitator is of the order of_______________?
A. 30 to 70 kV DC
B. 30 to 70 kV AC
C. 230 V AC
D. 230 V DC
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