McqMate
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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