This set of IC Engines Multiple Choice Questions & Answers (MCQs) focuses on “C.I. Engines”.
1. NOx is reduced in a CI engine by the use of EGR.
a) increased
b) reduced
c) unpredictable
d) none of the mentioned
View Answer
Explanation: By using EGR in a CI engine, generally the emission of NOx is reduced.
2. EGR and lower combustion temperatures contribute to an ____________ in solid soot.
a) decreases
b) increases
c) same
d) none of the mentioned
View Answer
Explanation: Frequent practice of EGR and lower combustion temperatures contribute to an increases in solid soot.
3. Platinum and palladium are two main catalyst materials used for converters on CI engines.
a) True
b) False
View Answer
Explanation: Platinum and palladium are only the two main catalyst materials that are used for converters on CI engines.
4. Platinum and palladium catalyst promotes the removal of ____________ of the gaseous HC in the exhaust.
a) 30-80%
b) 40-90%
c) 50-100%
d) none of the mentioned
View Answer
Explanation: In total platinum and palladium catalyst promote the removal of 30-80% of the gaseous HC in the exhaust.
5. Platinum and palladium catalyst promotes the removal of _____________ of the gaseous CO in the exhaust.
a) 30-80%
b) 40-90%
c) 50-100%
d) none of the mentioned
View Answer
Explanation: In total platinum and palladium catalyst promote the removal of 40-90% of the gaseous HC in the exhaust.
6. Diesel fuel contains sulphur impurities, and this leads to poisoning of the catalyst materials.
a) True
b) False
View Answer
Explanation: None.
7. Traps are filter-like system often made of ceramic in the form of a monolith or mat, or metal wire mesh.
a) True
b) False
View Answer
Explanation: None.
8. Traps typically remove _____________ of particulates in the exhaust flow.
a) 30-80%
b) 40-90%
c) 50-100%
d) 60-90%
View Answer
Explanation: 60-90% of particulates in the exhaust flow are removed by traps.
9. Regeneration does not consists of combusting the particulates in the excess oxygen contained in the exhaust of the lean operating CI engine.
a) True
b) False
View Answer
Explanation: In fact, regeneration consists of combusting the particulates in the excess oxygen contained in the exhaust of the lean operating CI engine.
10. With greatly increased mixing efficiency and speeds, large regions of fuel-rich mixtures can be avoided when combustion starts.
a) True
b) False
View Answer
Explanation: None.
Sanfoundry Global Education & Learning Series – IC Engine.
To practice all areas of IC Engine, here is complete set of 1000+ Multiple Choice Questions and Answers.
- Check IC Engine Books
- Apply for Mechanical Engineering Internship
- Check Mechanical Engineering Books
- Practice Mechanical Engineering MCQs