GATE CE : Environmental Engineering Quiz

Elevation and temperature data for a place are tabulated below:

Based on the above data, lapse rate an be referred as:

A coal containing 3 % sulphur is burnt completely to ash in a cement kiln @ 30 kg/min. The sulphur content in the ash is found to be 5% of initial amount of sulphur in the coal fed to the kiln. Calculate the annual rate of SO₂ emission from the kiln in tonnes/year.

A machine in a steel plate fabricating industry is found to be producing a sound level of 50dB. In the expansion plans one more such machine needs to be added. What will be the combined noise level?

If two sounds of 50dB and 60 dB are meeting then what will be the final sound level in dB?