McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 1. |
The centrifugal type supercharger is preferable only for |
| A. | low speeds |
| B. | high speeds |
| C. | high pressures |
| D. | none of the above |
| Answer» A. low speeds | |
| 2. |
The advantage of Root's supercharger is |
| A. | big pressure |
| B. | minimum maintenance |
| C. | consumes less power |
| D. | occupies less space |
| Answer» B. minimum maintenance | |
| 3. |
Supercharging air compressor is driven by |
| A. | exhaust gas turbine |
| B. | engine itself |
| C. | separate electrical motor |
| D. | none of the above |
| Answer» B. engine itself | |
| 4. |
If turbochargers compressor is driven by |
| A. | exhaust gas turbine |
| B. | engine itself |
| C. | separate electrical motor |
| D. | none of the above |
| Answer» A. exhaust gas turbine | |
| 5. |
Cooling after compression is necessary to |
| A. | increase the density of air |
| B. | reduce engine operating temperatures |
| C. | both (a) and (b) |
| D. | increase exhaust temperature |
| Answer» C. both (a) and (b) | |
| 6. |
Volumetric efficiency of supercharged engine is |
| A. | between 100 - 110% |
| B. | between 90 - 100% |
| C. | between 80 - 90% |
| D. | between 70 - 80% |
| Answer» A. between 100 - 110% | |
| 7. |
Supercharging is normally done in |
| A. | racing cars |
| B. | marine engines |
| C. | automotive diesel engines |
| D. | none of the above |
| Answer» D. none of the above | |
| 8. |
Compared to engine driven supercharger the exhaust driven super charger is |
| A. | easy to handle |
| B. | supplies more air |
| C. | utilizes the exhaust energy of the engine |
| D. | matching with engine is easy |
| Answer» C. utilizes the exhaust energy of the engine | |
| 9. |
Types of supercharger are |
| A. | reciprocating type |
| B. | gear type |
| C. | centrifugal type |
| D. | none of the above |
| Answer» C. centrifugal type | |
| 10. |
The operation of forcing additional air under pressure in the engine cylinder is known as |
| A. | scavenging |
| B. | turbulence |
| C. | supercharging |
| D. | pre-ignition |
| Answer» C. supercharging | |
| 11. |
Supercharging is essential in |
| A. | diesel engines |
| B. | gas turbines |
| C. | petrol engines |
| D. | aircraft engines. |
| Answer» D. aircraft engines. | |
| 12. |
The output of a diesel engine can be increased without increasing the engine revolution or size in following way |
| A. | feeding more fuel |
| B. | increasing flywheel size |
| C. | heating incoming air |
| D. | supercharging. |
| Answer» D. supercharging. | |
| 13. |
Supercharging is the process of |
| A. | supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere |
| B. | providing forced cooling air |
| C. | injecting excess fuel for raising more load |
| D. | supplying compressed air to remove combustion products fully |
| Answer» A. supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere | |
| 14. |
Pick up the wrong statement about supercharging |
| A. | supercharging reduces knocking in diesel engines |
| B. | there can be limited supercharging in petrol engines because of detonation |
| C. | supercharging at high altitudes is essential |
| D. | supercharging results in fuel economy |
| Answer» D. supercharging results in fuel economy | |
| 15. |
The reason for supercharging in any engine is to |
| A. | increase efficiency |
| B. | increase power |
| C. | reduce weight and bulk for a given out-put |
| D. | effect fuel economy |
| Answer» C. reduce weight and bulk for a given out-put | |
| 16. |
For the same power developed in I.C. engines, the cheaper system is |
| A. | naturally aspirated |
| B. | supercharged |
| C. | centrifugal pump |
| D. | turbo charger |
| Answer» B. supercharged | |
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