Air Pollution and its Control in Automobile MCQs

Question 1

What does the evaporation emission control eliminate?

Accepted Answer

HC

Answer

CO

Answer

CO2

Answer

NOx

Question 2

H2 emissions occur under . . . . . . . . operating conditions.

Accepted Answer

Rich

Answer

Lean

Answer

Constant

Answer

None of the mentioned

Question 3

What does the blue smoke in diesel engine indicate?

Accepted Answer

Unburnt oil

Answer

HC

Answer

NOx

Answer

CO

Question 4

The electronic control unit outputs a signal

Accepted Answer

To the driver unit

Answer

Directly to the throttle valve control motor

Answer

To the accelerator pedal position sensor

Answer

To the throttle position sensor

Question 5

Three-way catalytic converters reduce the emission of CO, HC, and soot.

Accepted Answer

False

Answer

True

Question 6

The primary condition that results in the emission of CO in large quantities is

Accepted Answer

Insufficient air during combustion

Answer

Lean air-fuel ratio during engine operation

Answer

Low temperature combustion

Answer

High temperature combustion

Question 7

What is the acronym for DPF in exhaust emission system?

Accepted Answer

Diesel particulate filter

Answer

Diesel pressure filter

Answer

Diesel primary filter

Answer

Direct particulate filter

Question 8

. . . . . . . . is the principal ingredient used in commercial catalysts to remove NO.

Accepted Answer

Rhodium

Answer

Aluminium

Answer

Platinum

Answer

None of the above

Question 9

Which pollutant is released more from diesel engine during weak compression?

Accepted Answer

Particulate matter

Answer

CO

Answer

HC

Answer

NOx