Air Pollution and its Control in Automobile MCQs

Question 1

. . . . . . . . is collected during engine startup time when the catalytic converter is cold, and then later released back into the exhaust flow when the converter is hot.

Accepted Answer

HC

Answer

CO

Answer

CO2

Answer

H2O

Question 2

Which one of the following toxic components of exhaust gas is stripped of oxygen in three-way catalytic converter?

Accepted Answer

NOx

Answer

CO

Answer

HC

Answer

N2

Question 3

In a turbocharger, the exhaust gases from the cylinder.

Accepted Answer

Turns the turbine wheel

Answer

Turns the centrifugal pump rotor

Answer

Heat the incoming air

Answer

Goes directly to the exhaust pipe

Question 4

Which of the following problem is caused by the clogged air cleaner element?

Accepted Answer

Reduced power

Answer

Reduced headlamp brightness

Answer

Increased idling speed

Answer

Increase in fuel efficiency

Question 5

More CO is generally formed when

Accepted Answer

Mixture is rich in fuel

Answer

Mixture is lean in fuel

Answer

Dust is present in fuel

Answer

Engine is 4 stroke

Question 6

For what purpose is the Rhodium used?

Accepted Answer

To reduce NOx

Answer

To reduce CO and HC

Answer

To reduce CO

Answer

To reduce HC

Question 7

The electronic control throttle system operates the throttle valve by

Accepted Answer

Using the accelerator pedal position sensor

Answer

Directly using a cable

Answer

Using an electric motor

Answer

Directly by the accelerator pedal

Question 8

The PCV system controls which exhaust emissions?

Accepted Answer

Both HC and CO

Answer

HC

Answer

CO

Answer

NOx

Question 9

Which one of the following correctly describes the basic function of a TWC?

Accepted Answer

It removes CO, HC and NOx from the exhaust gases passing through it

Answer

It reduces N2, H2O, and CO2 emission levels

Answer

It circulates exhaust gases

Answer

It burns fuel vapour gases