Air Pollution and its Control in Automobile MCQs

Question 1

The amount of flow in EGR, can be as high as . . . . . . . . of the total intake.

Accepted Answer

30%

Answer

20%

Answer

35%

Answer

40%

Question 2

Which of the hydro carbon emission released after the combustion of the engine?

Accepted Answer

From exhaust system

Answer

From fuel tank

Answer

From carburetor

Answer

From crank case blow by

Question 3

Oxides of nitrogen in the engines exhaust can be reduced by the following methods: 1. Decrease in compression ratio 2. Exhaust gas recirculation 3. Use of 5% lean mixture 4. Use of oxidation catalysts in exhaust manifold. The correct methods are

Accepted Answer

1 and 2

Answer

1 and 3

Answer

1, 2 and 4

Answer

2, 3 and 4

Question 4

Which one is a non pollution gas?

Accepted Answer

O2

Answer

CO

Answer

NO

Answer

HC

Question 5

The intake air-fuel mixture is used to push exhaust residual out of the open exhaust port called scavenging.

Accepted Answer

True

Answer

False

Question 6

Oxides of nitrogen can be controlled by

Accepted Answer

All the above

Answer

Exhaust gas recirculation

Answer

Catalyst

Answer

Water injection

Question 7

Which of the following is used as antiknock compound in gasoline?

Accepted Answer

Tetraethyl lead

Answer

Tetramethyl lead

Answer

Trimethyl lead

Answer

Triethyl lead

Question 8

In spark ignition petrol engines maximum emission of Nox takes place when the air fuel ratio (A/F) is

Accepted Answer

Chemically correct mixture and A/F ratio about 15

Answer

Very weak mixture and A/F ratio about 19

Answer

Weak mixture and A/F ratio about 17

Answer

Rich mixture and A/F ratio about 13.

Question 9

The component of air filter that prevents the passage of metal particles and sludge is

Accepted Answer

Filter element

Answer

Relief valve

Answer

Check valves

Answer

Case