A. Low amount of excess combustion air
B. Large quantity of excess combustion air
C. Hydrocarbon fuel
D. Pulverised coal as fuel
Related Mcqs:
- White smoke coming out of the chimney of a furnace indicates the use of_________________?
A. Low excess air
B. Very high excess air
C. Gaseous fuel in the furnace
D. Liquid fuel in the furnace - Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air’s water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes_________________?
A. Poor visibility due to sky darkening
B. Irritation in eyes
C. Respiratory trouble
D. All A., B. and C. - Ringelmann chart No. 2 corresponds to _______________ percent black smoke?
A. 10
B. 20
C. 40
D. 80 - Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about ____________ decibels?
A. 3
B. 30
C. 7
D. 70 - Sulphur dioxide present in the industrial chimney exhaust gases causes____________________?
A. Respiratory & lung disease
B. Reduction in plant’s productivity owing to acid rain
C. Corrosion of building materials
D. All A., B. and C. - Exposure to SO2 containing chimney gases results in the__________________?
A. Reduction in strength of leather & cloth
B. Acceleration of corrosion rates of metals
C. Increased drying & hardening time of paints
D. All A., B. and C. - 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. - Turbidity of water is an indication of the presence of__________________?
A. Suspended inorganic matter
B. Dissolved solids
C. Floating solids
D. Dissolved gases - Which is the most efficient dust removal equipment for removal of submicronic dust particles from blast furnace gas ?
A. Packed scrubber
B. Gravity settling chamber
C. Electrostatic precipitator
D. Hydrocyclone - Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________________?
A. Biological oxygen pond
B. Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)
C. Lagoons
D. Filtration
