MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Ic Engine knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Ignition quality of diesel fuel oil is expressed by an index called ___________ |
| A. | octane number |
| B. | cetane number |
| C. | calorific value |
| D. | none of the mentioned |
| Answer» C. calorific value | |
| 2. |
A fuel will detonate less if it has ___________ |
| A. | higher self ignition temperature |
| B. | lower self ignition temperature |
| C. | proper self ignition temperature |
| D. | none of the mentioned |
| Answer» B. lower self ignition temperature | |
| 3. |
The detonation tendency in petrol engines for specified conditions of fuel rating, compression ratio, speed, etc, can be controlled by having ___________ |
| A. | smaller cylinder bore |
| B. | bigger cylinder bore |
| C. | medium cylinder bore |
| D. | none of the mentioned |
| Answer» B. bigger cylinder bore | |
| 4. |
To reduce the possibility of knock in C.I. engines, the first elements of fuel and air should have ___________ |
| A. | high temperature |
| B. | high density |
| C. | short delay |
| D. | all of the mentioned |
| Answer» E. | |
| 5. |
In order to prevent knock in the S.I. engines, the charge away from the spark plug should have ___________ |
| A. | low temperature |
| B. | low density |
| C. | rich mixture |
| D. | all of the mentioned |
| Answer» E. | |
| 6. |
Detonation is caused by which of the following unstable compounds? |
| A. | peroxides, aldehydes, and ketones |
| B. | peroxides, aldehydes, oxides, and sulphides |
| C. | aldehydes, oxides, and ketones |
| D. | none of the mentioned |
| Answer» B. peroxides, aldehydes, oxides, and sulphides | |
| 7. |
The delay period in petrol engine is of the order of ___________ |
| A. | 0.001 sec |
| B. | 0.002 sec |
| C. | 0.01 sec |
| D. | 0.1 sec |
| Answer» C. 0.01 sec | |
| 8. |
What is Ignition lag? |
| A. | the time taken by fuel after injection to reach upto auto-ignition temperature |
| B. | time before actual fuel injection and the pump plunger starts to pump fuel |
| C. | time corresponding to actual injection and top dead center |
| D. | none of the mentioned |
| Answer» B. time before actual fuel injection and the pump plunger starts to pump fuel | |
| 9. |
What is Auto-ignition temperature? |
| A. | maximum temperature to which oil is heated in order to give off inflammable vapour in sufficient quantity to ignite momentarily when bought in contact with a flame |
| B. | that at which it catches fire without external aid |
| C. | indicated by 90% distillation temperature |
| D. | none of the mentioned |
| Answer» C. indicated by 90% distillation temperature | |
| 10. |
Violent sound pulsations within the cylinder of an I.C. engine are caused due to ___________ |
| A. | heavy turbulence |
| B. | improved scavenging |
| C. | detonation |
| D. | pre-ignition |
| Answer» D. pre-ignition | |
| 11. |
What is volatility of diesel fuel? |
| A. | maximum temperature to which oil is heated in order to give off inflammable vapour in sufficient quantity to ignite momentarily when bought in contact with a flame |
| B. | it catches fire without external aid |
| C. | indicated by 90% distillation temperature |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 12. |
The knock in diesel engine occurs due to ___________ |
| A. | instantaneous and rapid burning of the first part of the charge |
| B. | instantaneous auto ignition of last part of charge |
| C. | reduction of delay period |
| D. | none of the mentioned |
| Answer» B. instantaneous auto ignition of last part of charge | |
| 13. |
The rating of a diesel engine, with an increase in air inlet temperature, will ___________ |
| A. | increase linearly |
| B. | decrease linearly |
| C. | increase parabolically |
| D. | decrease parabolically |
| Answer» C. increase parabolically | |