Consider the following statements regarding electrostatic precipitato

1.	Consider the following statements regarding electrostatic precipitator.1. An electrostatic precipitator can remove over 60 per cent particulate matter present in the exhaust from a thermal power plant. 2. It has electrode wires that are maintained at several thousand volts, which produce a corona that releases electrons.Which of the statement given above is/are correct?1. 1 only2. 2 only3. Both 1 and 24. Neither 1 nor 2
Answer» Correct Answer - Option 2 : 2 only The correct answer is 2 only. There are several ways of removing particulate matter; the most widely used of which is the electrostatic precipitator, which can remove over 99 per cent particulate matter present in the exhaust from a thermal power plant. Hence, Statement 1 is incorrect. It has electrode wires that are maintained at several thousand volts, which produce a corona that releases electrons. Hence statement 2 is correct. These electrons attach to dust particles giving them a net negative charge. The collecting plates are grounded and attract the charged dust particles. The velocity of air between the plates must be low enough to allow the dust to fall. A scrubber can remove gases like sulfur dioxide. In a scrubber, the exhaust is passed through a spray of water or lime. Recently we have realized the dangers of particulate matter that are very very small and are not removed by these precipitators.

Consider the following statements regarding electrostatic precipitator.1. An electrostatic precipitator can remove over 60 per cent particulate matter present in the exhaust from a thermal power plant. 2. It has electrode wires that are maintained at several thousand volts, which produce a corona that releases electrons.Which of the statement given above is/are correct?1. 1 only2. 2 only3. Both 1 and 24. Neither 1 nor 2

Answer» Correct Answer - Option 2 : 2 only

The correct answer is 2 only.

There are several ways of removing particulate matter; the most widely used of which is the electrostatic precipitator, which can remove over 99 per cent particulate matter present in the exhaust from a thermal power plant. Hence, Statement 1 is incorrect.
- It has electrode wires that are maintained at several thousand volts, which produce a corona that releases electrons. Hence statement 2 is correct.
- These electrons attach to dust particles giving them a net negative charge.
- The collecting plates are grounded and attract the charged dust particles.
- The velocity of air between the plates must be low enough to allow the dust to fall.
A scrubber can remove gases like sulfur dioxide.
- In a scrubber, the exhaust is passed through a spray of water or lime.
- Recently we have realized the dangers of particulate matter that are very very small and are not removed by these precipitators.