Air Pollution and its Control in Automobile MCQs

Question 1

The function of charcoal in a canister is to absorb

Accepted Answer

Petrol vapour

Answer

Water vapour

Answer

Carbon monoxide

Answer

Liquid petrol

Question 2

Exhaust gas recirculation has the disadvantage of

Accepted Answer

Both A and B

Answer

Decreasing thermal efficiency

Answer

Increasing HC emission

Answer

Increasing aldehydes

Question 3

The environmentally harmful blow-by gas is also harmful to the engine, because

Accepted Answer

It reacts with engine oil to form sludge, which causes engine components to wear rapidly

Answer

It causes the exhaust ports to become clogged, and exhaust efficiency is reduced

Answer

It causes the intake ports to become clogged, and intake efficiency is reduced

Answer

None of the above

Question 4

The positive crankcase ventilation valve is located between the

Accepted Answer

Intake manifold and crankcase

Answer

Intake manifold and air cleaner

Answer

Air cleaner and the carburettor

Answer

Carburettor and the intake manifold

Question 5

Unburned hydrocarbons from propane are easier to oxidize in oxidation catalysis than methane, which result in:

Accepted Answer

Low unburned hydrocarbon emissions

Answer

Low nitrogen oxide emission

Answer

High carbon monoxide emission

Answer

High carbon dioxide emissions

Question 6

Catalytic converter trouble is indicated by

Accepted Answer

A rotten egg smell

Answer

High CO and HC levels in the exhaust

Answer

High engine noise level

Answer

Low H2O level in the exhaust gas

Question 7

What is the use of catalytic converters?

Accepted Answer

Control the emission

Answer

Control the noise

Answer

Control the temperature

Answer

Control the fuel consumption

Question 8

In a three-way catalytic converter, the first converter controls:

Accepted Answer

NOx

Answer

HC

Answer

CO

Answer

All the above

Question 9

A catalytic converter has to be at least how hot before it starts working?

Accepted Answer

500°F (260°C)

Answer

1000°F (540°C)

Answer

1500°F (815°C)

Answer

2000°F (1100°C)