MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Power Plant knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A_HIGHER_COMPRESSION_RATIO_CAUSES?$ |
| A. | increase in detonation |
| B. | pre-ignition |
| C. | an acceleration in the rate of combustion |
| D. | any one of the mentioned |
| Answer» E. | |
| 2. |
Which_one_of_the_following_event_would_reduce_volumetric_efficiency_of_a_vertical_compression_ignition_engine?$ |
| A. | inlet valve closing before bottom dead centre |
| B. | inlet valve closing after bottom dead centre |
| C. | inlet valve opening before top dead centre |
| D. | exhaust valve closing after top dead centre |
| Answer» B. inlet valve closing after bottom dead centre | |
| 3. |
A diesel engine is __________ as compared to petrol engine, both running at rated load? |
| A. | equally efficient |
| B. | more efficient |
| C. | less efficient |
| D. | all of the mentioned |
| Answer» C. less efficient | |
| 4. |
Solid fuel fabricated into various small shapes, which are assembled to form fuel elements, is in the form of |
| A. | pallets |
| B. | plates |
| C. | pins |
| D. | all of the mentioned |
| Answer» E. | |
| 5. |
In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure. |
| A. | equal to |
| B. | below |
| C. | above |
| D. | middle |
| Answer» C. above | |
| 6. |
The fuels in order of decreasing knock tendency for spark ignition engines are |
| A. | Paraffin, aromatic, napthene |
| B. | Paraffin, napthene, aromatic |
| C. | Napthene, aromatics, paraffin |
| D. | Napthene, paraffin, aromatic |
| Answer» C. Napthene, aromatics, paraffin | |
| 7. |
The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be |
| A. | 20% |
| B. | 25% |
| C. | 50% |
| D. | 55% |
| Answer» D. 55% | |
| 8. |
Pre-ignition is caused by the spontaneous combustion of the mixture before the end of the compression stroke, and is due to |
| A. | overheated spark plug points |
| B. | red hot carbon deposits on cylinder walls |
| C. | cylinder walls being too hot |
| D. | any of the mentioned |
| Answer» E. | |
| 9. |
The purpose of testing an internal combustion engine is |
| A. | to conform the data used in design, the validity of which may be doubtful |
| B. | to satisfy the customer regarding the performance of the engine |
| C. | to determine the information, which cannot be obtained by calculations |
| D. | all of the mentioned |
| Answer» E. | |
| 10. |
The reference fuels for knock rating of spark ignition engines would include |
| A. | normal octane and aniline |
| B. | iso-octane and normal hexane |
| C. | iso-octane and alpha-methyl naphthalene |
| D. | normal heptane and iso-octane |
| Answer» E. | |