McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
| 1. |
Aim of engine testing is |
| A. | to get specified information |
| B. | to justify rating of engine |
| C. | to validate design data |
| D. | all the above |
| Answer» D. all the above | |
| 2. |
Heat losses in an engine are indicative of |
| A. | thermal efficiency of engine |
| B. | indicated power |
| C. | brake power |
| D. | none of the above |
| Answer» A. thermal efficiency of engine | |
| 3. |
Power developed within the cylinder is called |
| A. | i.p. |
| B. | b.p. |
| C. | f.p. |
| D. | unavailable power |
| Answer» A. i.p. | |
| 4. |
Power available at output shaft is called |
| A. | i.p. |
| B. | b.p. |
| C. | f.p. |
| D. | unavailable power |
| Answer» B. b.p. | |
| 5. |
Mechanical losses in engine equal to |
| A. | b.p/i.p |
| B. | i.p./b.p |
| C. | i.p./b.p. |
| D. | b.p./i.p |
| Answer» C. i.p./b.p. | |
| 6. |
Best method to measure indicated mean effective pr (imep) is by |
| A. | mechanical indicator |
| B. | electronic indicator |
| C. | electrical indicator |
| D. | all are equal efficient |
| Answer» B. electronic indicator | |
| 7. |
Indicator diagram is used to measure |
| A. | imep |
| B. | speed |
| C. | temperature |
| D. | f.p. |
| Answer» A. imep | |
| 8. |
Indicator diagram is the plot of_____on cartesian co-ordinates. |
| A. | p-v |
| B. | p-t |
| C. | t-v |
| D. | t-p |
| Answer» A. p-v | |
| 9. |
Mechanical indicators are suitable to measure imp in case of |
| A. | low speed engine up to 1500 rpm |
| B. | medium speed engines (1500-3000) |
| C. | high speed engines more than 3000 rpm |
| D. | none of the above |
| Answer» A. low speed engine up to 1500 rpm | |
| 10. |
If a= net area of diagram in mm², l= length of indicator diagram in cm & k= spring constant in N/m²/m the imp in bar equals |
| A. | (a/l)xk |
| B. | (a/l) x k x 10ˉ⁹ |
| C. | (a/l) x k x 10ˉ⁶ |
| D. | (a/l) x k x 10ˉ³ |
| Answer» B. (a/l) x k x 10ˉ⁹ | |
| 11. |
Engine indicator is used to measure |
| A. | bmep |
| B. | imep |
| C. | b.p |
| D. | i.p |
| Answer» B. imep | |
| 12. |
If work developed by the engine per cycle is W, then the indicated mean effective pr equals to |
| A. | w |
| B. | w / stroke volume |
| C. | w / length of stroke |
| D. | w x stroke volume |
| Answer» B. w / stroke volume | |
| 13. |
Best method to measurement of B.P. is |
| A. | rope brake dynamometer |
| B. | prony brake dynamometer |
| C. | hydraulic dynamometer |
| D. | all are equal |
| Answer» C. hydraulic dynamometer | |
| 14. |
Which of the dynamometer cannot be used for measurement of B.P. at high speeds |
| A. | prony brake |
| B. | hydraulic |
| C. | swing field |
| D. | none of the above |
| Answer» A. prony brake | |
| 15. |
Which of the following dynamometer is suitable to measure B.P. of an aircraft |
| A. | prony brake |
| B. | hydraulic |
| C. | swinging field |
| D. | eddy current |
| Answer» D. eddy current | |
| 16. |
F.P.______with increase in speed |
| A. | increases |
| B. | remains same |
| C. | decreases |
| D. | can not say |
| Answer» A. increases | |
| 17. |
Which is the best way to measure F.P. of an I.C., engine |
| A. | willan\s line method |
| B. | morse test |
| C. | motoring test |
| D. | all are the equal effective |
| Answer» B. morse test | |
| 18. |
Willan's line method for determining F.P. is applicable to |
| A. | c.i engines |
| B. | engine runs at constant speed |
| C. | both a & b |
| D. | none of the above |
| Answer» C. both a & b | |
| 19. |
I.P. of engine can be determined by |
| A. | willan\s line method |
| B. | morse test |
| C. | motoring test |
| D. | none of the above |
| Answer» B. morse test | |
| 20. |
Increase in F.P. of an engine causes |
| A. | reduced b.p. |
| B. | increased cooling load |
| C. | increased s.f.c. |
| D. | all the above |
| Answer» D. all the above | |
| 21. |
Morse test in multi cylinder engine is used to determine |
| A. | mechanical efficiency |
| B. | thermal efficiency |
| C. | air standard l efficiency |
| D. | relative l efficiency |
| Answer» A. mechanical efficiency | |
| 22. |
Which is assumed constant in determining F.P. by Willan's line method. |
| A. | mechanical efficiency |
| B. | beake thermal efficiency |
| C. | indicated thermal efficiency |
| D. | none of the above |
| Answer» C. indicated thermal efficiency | |
| 23. |
The range of mechanical efficiency for automobile is |
| A. | 0-30% |
| B. | 30-50% |
| C. | 70-80% |
| D. | 90-100% |
| Answer» C. 70-80% | |
| 24. |
The measurement of frictioned power by Willans line is applicable only to |
| A. | c.i engine at a particualr speed |
| B. | s.i engine at a particular speed |
| C. | any engine at a particular speed only |
| D. | none of the above |
| Answer» A. c.i engine at a particualr speed | |
| 25. |
morse test is applicable only to |
| A. | single cylinder c.i engines |
| B. | single cylinder s.i engine |
| C. | multi cylinder c.i engine |
| D. | single and multi cylinder c.i and s.i engine |
| Answer» C. multi cylinder c.i engine | |
| 26. |
the most accurate method of determining friction power is by |
| A. | willins line |
| B. | morse test |
| C. | motoring test |
| D. | measurement of brake and indicated power |
| Answer» D. measurement of brake and indicated power | |
| 27. |
in the air base method of measuring air flow, the air base is provided to |
| A. | damp out the pulsations |
| B. | have constant temprature |
| C. | have constant flow |
| D. | provide constant velocity of flow |
| Answer» C. have constant flow | |
| 28. |
the air box/ swept volume ratio should be in the range for single cylinder engine |
| A. | 10-100% |
| B. | 200-300% |
| C. | 500-600% |
| D. | 10 |
| Answer» C. 500-600% | |
| 29. |
the best method of measuring speed is by |
| A. | mechanical tachometer |
| B. | electric tachometer |
| C. | magnetic pickup |
| D. | none of the above |
| Answer» A. mechanical tachometer | |
| 30. |
flame ionization detector is used for measuring |
| A. | hc |
| B. | co |
| C. | nox |
| D. | co2 |
| Answer» A. hc | |
| 31. |
chemilumme scence analyzer is used for measuring |
| A. | hc |
| B. | co |
| C. | nox |
| D. | co2 |
| Answer» C. nox | |
| 32. |
non dispersive infrared analyzer is widely accepted instrument for measuring |
| A. | unburned hydrocarbons |
| B. | carbone monoxide |
| C. | carbone dioxide |
| D. | nox |
| Answer» B. carbone monoxide | |
| 33. |
if n is theorem, number of power stroke per minute in a four stroke enigne is |
| A. | n/2 |
| B. | n |
| C. | 2n |
| D. | 4n |
| Answer» A. n/2 | |
| 34. |
if n is the rpm, number of power strokes per min in a two stroke engine is |
| A. | n/2 |
| B. | n |
| C. | 2n |
| D. | 4n |
| Answer» B. n | |
| 35. |
mechanical effficiency is the ratio of |
| A. | frictional power to brake power |
| B. | frictional power to indicated power |
| C. | brake power to indicated power |
| D. | indicated power ot frictional power |
| Answer» C. brake power to indicated power | |
| 36. |
volumetric efficiency is a measure of |
| A. | power of the enigne |
| B. | speed of the engine |
| C. | brathing capacity of the engine |
| D. | pressure rise in the cylinder |
| Answer» C. brathing capacity of the engine | |
| 37. |
thermal efficiency varries |
| A. | inversely as specific fuel consumption |
| B. | directly as specific fuel consumption |
| C. | as square as specific fuel consumption |
| D. | as root as specific fuel consumption |
| Answer» A. inversely as specific fuel consumption | |
| 38. |
the spark timing and combustion rate should be should be such that |
| A. | one half of the total pressure occurs at tdc |
| B. | ignition delay is reduced |
| C. | peak pressure occurs at tdc |
| D. | none of the above |
| Answer» A. one half of the total pressure occurs at tdc | |
| 39. |
indicated power is directly proportional to |
| A. | air consumption |
| B. | torque |
| C. | cylinder peak pressure |
| D. | none of the above |
| Answer» A. air consumption | |
| 40. |
the brake thermal efficiecny of SI engine is in the range of |
| A. | 35%-60% |
| B. | 25%-35% |
| C. | 60%-80% |
| D. | none of the above |
| Answer» B. 25%-35% | |
| 41. |
the boiling point of a four cylinder engine is 30 with all cylinder firing and 20 with one cylindr cut |
| A. | 0.6 |
| B. | 0.75 |
| C. | 0.8 |
| D. | none of the above |
| Answer» B. 0.75 | |
| 42. |
The bore and stroke of a single cylinder four stroke engine are 100 mm and 160 mm resp. if the brake torqe is 50NM, the brake mean effective pressure is |
| A. | 5 bar |
| B. | 7-6bar |
| C. | 10bar |
| D. | 15bar |
| Answer» A. 5 bar | |
| 43. |
the volumetric efficiecy of a well disigned engine is the |
| A. | 30-40% |
| B. | 40-60% |
| C. | 60-70% |
| D. | 75-90% |
| Answer» D. 75-90% | |
| 44. |
if the performance of SI engine manufacturer having different capacities sizes and system are to be compared , the common parameter would be |
| A. | engine cylinder diameter |
| B. | b.h.p |
| C. | speed |
| D. | mean effective pressure |
| Answer» D. mean effective pressure | |
| 45. |
mores test is conducted on |
| A. | single cylinder c.i engines |
| B. | multi cylinder engine |
| C. | vcc engine |
| D. | horizontle engine |
| Answer» B. multi cylinder engine | |
| 46. |
endurance test for IC engine is conducted for |
| A. | 100hrs |
| B. | 200hrs |
| C. | 400hrs |
| D. | 500hrs |
| Answer» D. 500hrs | |
| 47. |
which of the following factor will not assist in improving thermal efficiency of a compression ignition engine |
| A. | fine atomisation and even distribution of fuel |
| B. | miniumum heat loss during combustion |
| C. | clear exhaust |
| D. | high surgace to volume ratio |
| Answer» D. high surgace to volume ratio | |
| 48. |
which statement is correct |
| A. | morese test can be conducted on petrol engine |
| B. | morese test can be conducted on diesel engine |
| C. | morese test can be conducted only on multicylinder engine |
| D. | morese test can be conducted on crf engine |
| Answer» C. morese test can be conducted only on multicylinder engine | |
| 49. |
rope brake dynamometer falls under the category of |
| A. | hydraulic dynamometer |
| B. | transmission type dynamometer |
| C. | mechanical friction type dynamometer |
| D. | torsion type dynamometer |
| Answer» C. mechanical friction type dynamometer | |
| 50. |
prony brakes are used for testing |
| A. | small engine |
| B. | large capasity engine |
| C. | highspeed engine |
| D. | slow speed engine |
| Answer» A. small engine | |
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