Air Pollution and its Control in Automobile MCQ Questions & Answers

21

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

A) Cruising B) Idling C) Accelerating D) Decelerating

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Answer & Solution

Answer: Option B

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22

The path taken by the intake air is

A) Carburettor (or throttle body) - air cleaner - intake manifold - intake ports - cylinders B) Air cleaner - carburettor (or throttle body) - intake ports - intake manifold - cylinders C) Air cleaner - intake manifold - carburettor (or throttle body) - intake ports - cylinders D) Air cleaner - carburettor (or throttle body) - intake manifold - intake ports - cylinders

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Answer & Solution

Answer: Option D

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23

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

A) Water reacts with nitrogen oxides B) Water does not contain nitrogen C) The combustion temperature decreased D) The combustion temperature increased

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Answer & Solution

Answer: Option C

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24

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

A) Enters the throttle body B) Is stored in the EVAP control canister C) Is released to the atmosphere D) Is returned to the fuel tank

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Answer & Solution

Answer: Option D

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25

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

A) Combustion within a narrow margin of the stoichiometric air-fuel ratio B) Combustion with a fairly lean air-fuel mixture C) Combustion with a fairly rich air-fuel mixture D) A catalyst temperature not exceeding 200°C at any time

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Answer & Solution

Answer: Option A

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26

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

A) CO B) Nox C) CO₂ D) H₂O

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Answer & Solution

Answer: Option B

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27

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

A) Reduce CO₂ B) Reduce PM C) Reduce NO_x D) Reduce HC

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Answer & Solution

Answer: Option C

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28

Purging of the charcoal canister occurs when

A) Air flow from the fuel tank flows through the canister B) Air flows from the float bowls through the canister C) Air flows through the canister on its way to the intake manifold D) Air flows through the canister on its way to the exhaust manifold

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Answer & Solution

Answer: Option C

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29

Cyanuric acid is a . . . . . . . . solid material that sublimes in the exhaust flow.

A) High-cost B) Low-cost C) Unpredictable D) None of the mentioned

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Answer & Solution

Answer: Option B

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30

Which of the following are the separable methods used in exhaust gas measurement?

A) Orsat gas analyzer B) Gas chromatography C) Flame ionization detector D) All of the above

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Answer & Solution

Answer: Option D

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Air Pollution and its Control in Automobile MCQ Questions & Answers | Automobile Engineering