MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following has the highest cetane number? |
| A. | n-heptane |
| B. | n-hexane |
| C. | n-pentane |
| D. | n-butane |
| Answer» B. n-hexane | |
| 2. |
Which of the following exhaust gas produces least harmless components after its combustion? |
| A. | Carbon monoxide |
| B. | Ethyne |
| C. | NOx |
| D. | N2 |
| Answer» E. | |
| 3. |
By which process does the knocking starts in diesel engine? |
| A. | Due to sudden spontaneous combustion of last portion of fuel |
| B. | Due to delay in spontaneous combustion of last portion of fuel |
| C. | Due to the rise in temperature of diesel engine |
| D. | Due to the parts of diesel engine |
| Answer» C. Due to the rise in temperature of diesel engine | |
| 4. |
Which of the following is used to reduce the surface tension in diesel fuel? |
| A. | Chemical additives |
| B. | Inhibitors |
| C. | Poly hydrocarbon |
| D. | Dopes |
| Answer» B. Inhibitors | |
| 5. |
Which of the following substance is used to decrease knocking in diesel fuel? |
| A. | Tetra ethyl lead |
| B. | Benzene |
| C. | Sodium hydroxide |
| D. | Acetone peroxide |
| Answer» E. | |
| 6. |
The knocking characteristic of gasoline fuel are expressed in terms of cetane number. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
What should be the cetane number of middle speed diesel engine? |
| A. | At least 35 |
| B. | At least 25 |
| C. | At least 65 |
| D. | At least 45 |
| Answer» B. At least 25 | |
| 8. |
Which of the following compound is considered for calculating the cetane number? |
| A. | α-methyl naphthalene |
| B. | n-hexane |
| C. | iso-octane |
| D. | cetane molecule |
| Answer» E. | |
| 9. |
Which of the following compound readily goes under the process of knocking? |
| A. | 2-ethly butane |
| B. | n-heptane |
| C. | benzene |
| D. | toluene |
| Answer» C. benzene | |
| 10. |
Which of the following compound is considered for calculating the octane number? |
| A. | n-heptane |
| B. | n-hexane |
| C. | iso-octane |
| D. | iso-butane |
| Answer» D. iso-butane | |