Air Pollution and its Control in Automobile MCQs

Question 1

How do we achieve near zero emission diesel engines?

Accepted Answer

Combo of EGR and SCR

Answer

Combo of PCV and EGR

Answer

Combo of PCV and 3 way catalytic connection

Answer

Combo of DPF and EGR

Question 2

Name the emission control technique when some amount of gases feed into the intake manifold of a running engine?

Accepted Answer

Exhaust gas recirculation

Answer

Positive crank case ventilation

Answer

Catalytic convention

Answer

Selective catalytic reduction

Question 3

During which condition of the vehicle does NOx emission in SI engine will be lowest?

Accepted Answer

Idling

Answer

Cruising

Answer

Accelerating

Answer

Decelerating

Question 4

The path taken by the intake air is

Accepted Answer

Air cleaner - carburettor (or throttle body) - intake manifold - intake ports - cylinders

Answer

Carburettor (or throttle body) - air cleaner - intake manifold - intake ports - cylinders

Answer

Air cleaner - carburettor (or throttle body) - intake ports - intake manifold - cylinders

Answer

Air cleaner - intake manifold - carburettor (or throttle body) - intake ports - cylinders

Question 5

When water emulsion is used as the fuel in SI engine the emission of nitrogen oxides reduces significantly, this is due to

Accepted Answer

The combustion temperature decreased

Answer

Water reacts with nitrogen oxides

Answer

Water does not contain nitrogen

Answer

The combustion temperature increased

Question 6

When a fuel tank becomes cold such that a vacuum is created inside it then the fuel vapour held in the EVAP control canister

Accepted Answer

Is returned to the fuel tank

Answer

Enters the throttle body

Answer

Is stored in the EVAP control canister

Answer

Is released to the atmosphere

Question 7

The condition that is required for simultaneous treatment of CO, HC and NOx in a three way catalytic is

Accepted Answer

Combustion within a narrow margin of the stoichiometric air-fuel ratio

Answer

Combustion with a fairly lean air-fuel mixture

Answer

Combustion with a fairly rich air-fuel mixture

Answer

A catalyst temperature not exceeding 200°C at any time

Question 8

Which of the following exhaust gas component is reduced significantly by retardation of the ignition timing?

Accepted Answer

Nox

Answer

CO

Answer

CO2

Answer

H2O

Question 9

What is the purpose of selective catalytic reduction (SCR)?

Accepted Answer

Reduce NOx

Answer

Reduce CO2

Answer

Reduce PM

Answer

Reduce HC