Air Pollution and its Control in Automobile MCQs

Question 1

A diesel engine has excessive black smoke when started in the morning. Which of these could be the cause?

Accepted Answer

A bad fuel injector nozzle

Answer

A restricted fuel filter

Answer

A blocked fuel tank vent

Answer

A leaking fuel return line

Question 2

What is the purpose of EVAP canister?

Accepted Answer

To trap the fuel vapor

Answer

To trap the exhaust gas

Answer

To trap fresh air

Answer

To trap the leak off

Question 3

The NOx level in engine exhaust gas can be reduces by following method:

Accepted Answer

Exhaust gas recirculation

Answer

Thermal reactor

Answer

Advance spark timing or fuel Injection

Answer

Use of after burner

Question 4

The quantity of soot formed depends upon

Accepted Answer

All the above

Answer

The local FIA ratios

Answer

The type of fue

Answer

The pressure

Question 5

Which is used to absorb fuel vapor in the EVAP canister?

Accepted Answer

Activated charcoal

Answer

Banian cloth

Answer

Cotton roll

Answer

Paper filter

Question 6

Oxides of nitrogen in Petrol engine exhaust can be reduced by the following methods: 1. Use of 5% lean mixture 2. Advancing the spark timing 3. Recirculating a fraction of exhaust gas 4. Using an oxidation catalyst in the exhaust manifold Which of the above statements is/are correct?

Accepted Answer

3 only

Answer

1 and 2

Answer

2 only

Answer

3 and 4

Question 7

Exhaust gas recycle is done by ducting some of the exhaust flow back into the intake system.

Accepted Answer

True

Answer

False

Question 8

. . . . . . . . are materials that absorb selected molecular compounds and catalyze chemical reactions.

Accepted Answer

Zeolite

Answer

Catalysts

Answer

Chromium

Answer

None of the mentioned

Question 9

Which of the following causes the photochemical smog?

Accepted Answer

NOx and HC

Answer

Excess O2

Answer

CO and CO2

Answer

Soot and particulate matter