Automotive Pollution and Control MCQs

Question 1

What is the purpose of selective catalytic reduction (SCR)?

Accepted Answer

Reduce NO x

Answer

Reduce CO 2

Answer

Reduce PM

Answer

Reduce HC

Question 2

H 2 emissions occur under . . . . . . . . operating conditions.

Accepted Answer

Rich

Answer

Lean

Answer

Constant

Answer

None of the mentioned

Question 3

What can be reduced by using exhaust gas recirculation (EGR) effectively?

Accepted Answer

NO x

Answer

CO

Answer

HC

Answer

CO and HC

Question 4

Which is a green house effect gas?

Accepted Answer

CO 2

Answer

O 2

Answer

CO

Answer

N 2

Question 5

EGR system recirculates a smallmetered amount of the inert exhaust gas back into the intake manifold:

Accepted Answer

To reduce peak combustion temperature and lower the formation of NO

Answer

To reduce the combustion temperature and lower the formation of N 2

Answer

To increase peak combustion temperature and lower the formation of NO

Answer

To reduce the exhaust gas temperature and lower the formation of particulate matter

Question 6

The PCV system controls which exhaust emissions?

Accepted Answer

Both HC and CO

Answer

HC

Answer

CO

Answer

NO x

Question 7

Which of the following cannot be reduced by thermal converters?

Accepted Answer

NO x

Answer

CO

Answer

HC

Answer

Soot

Question 8

Which of the following exhaust gas component is reduced significantly by retardation of the ignition timing?

Accepted Answer

Nox

Answer

CO

Answer

CO 2

Answer

H 2 O

Question 9

Which one of the toxic component is reduced by an EGR system?

Accepted Answer

NOx

Answer

CO

Answer

HC

Answer

N 2