McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
Chapters
| 1. |
The measurement of frictional power by Willans line is applicable only to |
| A. | SI engines at a particular speed |
| B. | CI engines at a particular speed |
| C. | any engine at a particular speed only |
| D. | none of the above |
| Answer» B. CI engines at a particular speed | |
| 2. |
Morse test is applicable only to |
| A. | single cylinder SI engines |
| B. | single cylinder CI engines |
| C. | multicylinder CI engines |
| D. | single and multicylinder SI and CI engines |
| Answer» C. multicylinder CI engines | |
| 3. |
The most accurate method of determining fp is by |
| A. | Willan's line |
| B. | Morse test |
| C. | measurement of brake and indicated power |
| D. | motoring test |
| Answer» C. measurement of brake and indicated power | |
| 4. |
In the air box method of measuring air flow, the air box is provided to |
| A. | have constant temperature |
| B. | have constant flow |
| C. | damp out the pulsations |
| D. | provide constant velocity of flow |
| Answer» C. damp out the pulsations | |
| 5. |
The air box/swept volume ratio should be in the range for single-cylinder engines |
| A. | 10- 100% |
| B. | 200-300% |
| C. | 500 600% |
| D. | > 1000% |
| Answer» C. 500 600% | |
| 6. |
The best method of measuring speed is by |
| A. | mechanical tachometer |
| B. | electrical tachometer |
| C. | magnetic pickup |
| D. | none of the above |
| Answer» C. magnetic pickup | |
| 7. |
Flame ionization detector is used for measuring |
| A. | CO |
| B. | HC |
| C. | NOx |
| D. | CO2 |
| Answer» B. HC | |
| 8. |
Chemilumine scence analyzer is used for measuring |
| A. | NOx |
| B. | CO |
| C. | HC |
| D. | CO2 |
| Answer» A. NOx | |
| 9. |
Non-dispersive infra-red analyzer is widely accepted instrument for measuring |
| A. | NO |
| B. | HC |
| C. | CO |
| D. | CO2 |
| Answer» C. CO | |
| 10. |
Thermal efficiency varies |
| A. | inversely as sfc |
| B. | directly as sfc |
| C. | as square as sfc |
| D. | as root as sfc |
| Answer» A. inversely as sfc | |
| 11. |
Mechanical efficiency is ratio of |
| A. | fp to bp |
| B. | fp to ip |
| C. | bp to ip |
| D. | ip to fp |
| Answer» C. bp to ip | |
| 12. |
For N is the rpm, number of power strokes per minute in a four-stroke engine is |
| A. | 2N |
| B. | N/2 |
| C. | N |
| D. | 4N |
| Answer» B. N/2 | |
| 13. |
If N is the rpm, number of power strokes per minute in a two-stroke engine is |
| A. | N |
| B. | 2N |
| C. | N/2 |
| D. | 4N |
| Answer» A. N | |
| 14. |
The spark timing and combustion rate should be such that |
| A. | peak pressure occurs at TDC |
| B. | one half of the total pressure occurs at TDC |
| C. | ignition delay is reduced |
| D. | none of the above |
| Answer» B. one half of the total pressure occurs at TDC | |
| 15. |
Volumetric efficiency is a measure of |
| A. | speed of the engine |
| B. | power of the engine |
| C. | breathing capacity of the engine |
| D. | pressure rise in the cylinder |
| Answer» C. breathing capacity of the engine | |
| 16. |
Indicated power is directly proportional to |
| A. | torque |
| B. | air consumption |
| C. | cylinder peak pressure |
| D. | none of the above |
| Answer» B. air consumption | |
| 17. |
Turbocharger engines are those in which charge density is increased by |
| A. | separate air compressors |
| B. | compressors driven by exhaust gas turbine |
| C. | cooling inlet air |
| D. | none of the above |
| Answer» B. compressors driven by exhaust gas turbine | |
| 18. |
Brake thermal efficiency of SI engine is in the range |
| A. | 35% to 60% |
| B. | 25% to 35% |
| C. | 60% to 80% |
| D. | none of the above |
| Answer» B. 25% to 35% | |
| 19. |
The volumetric efficiency of a well-designed engine is in the range |
| A. | 30 to 40% |
| B. | 40 to 609% |
| C. | 60 to 70% |
| D. | 75 to 90% |
| Answer» D. 75 to 90% | |
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