Environmental Engineering Questions

• Pick out the wrong statement.
• Tolerable limit of nitrogen oxides in air is __________ ppm.
• Which of the following is the most detrimental for water used in high pressure boiler?
• Which is a secondary air pollutant?
• Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is
• Persons working in cement plants and limestone quarries are more prone to disease like
• Pick out the wrong statement.
• Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants?
• In water chemical treatment plant, use of chloramines ensures
• 80% less than 200 mesh size particles are called
• Tri-sodium phosphate is used in boiler water treatment to reduce
• Iron & manganese present as pollutant in water can not be removed by
• 'Pneumoconiosis' is a disease caused by the inhalation of __________ dust.
• The commonest form of iron & manganese found in ground water as pollutant is in the form of their
• Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.
• TLV of mercury in potable (drinking) water is about __________ ppm.
• Smoke is produced due to
• Main pollutants released from iron & steel industry is
• Which of the following dust collection equipments is the least efficient (for sub-micronic particles)?
• Siderosis is a disease caused by the inhalation of __________ dust.