Air Pollution and its Control in Automobile MCQs

Question 1

What is positive crank case ventilation?

Accepted Answer

HC present in the blow by reused

Answer

Use of back pressure to increase efficiency

Answer

HC present in blow by drawn out

Answer

Increase the crank case dilution

Question 2

In a wet type air cleaner filter, the element is made up of a paper that is slightly impregnated with oil.

Accepted Answer

True

Answer

False

Question 3

Which one of the following variable is sensed by an EGR lift sensor?

Accepted Answer

The extent to which the EGR valve is open

Answer

The oxygen content of the exhaust gas

Answer

The exhaust gas temperature

Answer

The exhaust gas flow rate

Question 4

Which engine uses EVAP canister?

Accepted Answer

Petrol engine

Answer

Diesel engine

Answer

LPG engine

Answer

CNG engine

Question 5

Which is a green house effect gas?

Accepted Answer

CO2

Answer

O2

Answer

CO

Answer

N2

Question 6

The main function of an exhaust muffler is

Accepted Answer

Reduction of exhaust noise

Answer

Reduction of nitrogen oxides in the exhaust gases

Answer

Reduction of exhaust gas volume

Answer

Optimization of exhaust efficiency

Question 7

Where the positive crank case ventilation fitted?

Accepted Answer

Engine breather and air cleaner

Answer

Muffler and air cleaner

Answer

Controller and air cleaner

Answer

Feed pump and air cleaner

Question 8

What is the purpose of EGR (Exhaust gas recirculation) valve?

Accepted Answer

Reduce NOx

Answer

Reduce CO

Answer

Reduce CO2

Answer

Reduce SO2

Question 9

The main purpose of an engine's air cleaner is that it

Accepted Answer

Prevents the dust and other foreign matter from entering the engine

Answer

Prevents rainwater from entering the engine

Answer

Controls the engine's air intake volume

Answer

Reduce the engine's air intake noise