250+ TOP MCQs on Reducing Emissions by Chemical Methods and Answers

IC Engine Quiz on “Reducing Emissions by Chemical Methods”.

1. 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
Answer: b
Clarification: Cyanuric acid is a low-cost solid material in comparison to other chemicals that sublime in the exhaust flow.

2. ____________ are materials that absorb selected molecular compounds and catalyze chemical reactions.
a) Catalysts
b) Chromium
c) Zeolite
d) None of the mentioned
Answer: c
Clarification: Zeolite are materials that absorb selected molecular compounds and catalyze chemical reactions, while catalysts are not material and also chromium does not serve the purpose of absorption.

3. ____________ is collected during engine startup time when the catalytic converter is cold, and then later released back into the exhaust flow when the converter is hot.
a) HC
b) CO
c) CO₂
d) H₂O
Answer: a
Clarification: Only HC is collected during engine startup time when the catalytic converter is cold, and then later released back into the exhaust flow when the converter is hot and no other gases.

4. A ____________ reduction of cold-start HC has been achieved.
a) 20%
b) 30%
c) 35%
d) 40%
Answer: c
Clarification: Till now only 35% reduction of cold-start HC has been achieved.

5. H₂ emissions occur under ____________ operating conditions.
a) rich
b) lean
c) constant
d) none of the mentioned
Answer: a
Clarification: Only H₂ emissions occur when the operating conditions are rich.

6. Exhaust gas recycle is done by ducting some of the exhaust flow back into the intake system.
a) True
b) False
Answer: a
Clarification: Exhaust gas recycle is done by ducting some of the exhaust flow back into the intake system, usually immediately after the throttle.

7. The amount of flow in EGR, can be as high as ____________ of the total intake.
a) 20%
b) 30%
c) 35%
d) 40%
Answer: b
Clarification: None.

8. EGR combines with the exhaust residual left in the cylinder from the previous cycle to effectively reduce the ____________ combustion temperature.
a) minimum
b) maximum
c) unpredictable
d) none of the mentioned
Answer: b
Clarification: EGR combines with the exhaust residual left in the cylinder from the previous cycle to effectively reduce the maximum combustion temperature as during exhaust the temperature is very high.

9. The flow rate of EGR is not controlled by the Engine management system.
a) True
b) False
Answer: b
Clarification: The flow rate of EGR is only controlled by the Engine management system.

10. ____________ in EGR results in some cycle partial burns and, in the extreme, total misfires.
a) Decrease
b) Increase
c) Consistency
d) None of the mentioned
Answer: a
Clarification: When there is an increase in EGR it results in some cycle partial burns and, in the extreme, total misfires.

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