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Chapter 16: Problem 11

Which statement is incorrect about ESP (Electrostatic Precipitator)? (a) Corona produces electrons. (b) Collecting plates are grounded, so it is used to attract the charged dust particle. (c) Velocity of air between the plates must be low. (d) Electrodes wires that are maintained at hundred volts produces corona.

Short Answer

Expert verified
Statement (d) 'Electrodes wires that are maintained at hundred volts produces corona' is incorrect, because the voltage required to produce corona discharge is typically several thousand volts, not hundred.

Step by step solution

01

Evaluate Statement (a)

Evaluate statement (a): 'Corona produces electrons.' It is correct as corona discharge does indeed produce electrons.
02

Evaluate Statement (b)

Next, look at statement (b): 'Collecting plates are grounded, so it is used to attract the charged dust particle.' This is also correct. In an ESP, collecting plates are grounded to create a strong electric field between the discharge electrodes and the collecting plates, and it attracts the charged dust particles.
03

Evaluate Statement (c)

Next, turn to statement (c): 'Velocity of air between the plates must be low.' This statement is correct, too. If the velocity of air is too high, then the dust particles won鈥檛 get enough time to be attracted to the plates, and they might escape.
04

Evaluate Statement (d)

Finally, evaluate statement (d): 'Electrodes wires that are maintained at a hundred volts produces corona.' In contrast to other statements, this one is incorrect. The voltage required to trigger a corona discharge is typically several thousand, not hundred, volts. Hence, it is most likely the incorrect statement.

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