McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
| 1. |
The range of mechanical efficiency for automobile is |
| A. | 0-30% |
| B. | 30-50% |
| C. | 70-80% |
| D. | 90-100% |
| Answer» C. 70-80% | |
| 2. |
The measurement of fractioned power by Willans line is applicable to |
| A. | ci engine at particular speed |
| B. | si engine at particular speed |
| C. | any engine at particular speed |
| D. | none of the above |
| Answer» B. si engine at particular speed | |
| 3. |
Morse test is only applicable to |
| A. | single cylinder si engine |
| B. | single cylinder ci engine |
| C. | multicylinder ci engine |
| D. | single and multi cylinder si & ci engine |
| Answer» C. multicylinder ci engine | |
| 4. |
The most accurate method of determining friction power is by |
| A. | willans line |
| B. | morse test |
| C. | motoring test |
| D. | measurement of brake and indicated power |
| Answer» D. measurement of brake and indicated power | |
| 5. |
In the air base method of measuring air flow, the air base is provided to |
| A. | damp out the pulsation |
| B. | have a constant temperature |
| C. | have a constant flow |
| D. | provide constant velocity of flow |
| Answer» C. have a constant flow | |
| 6. |
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% | |
| 7. |
The best method of measuring speed is by |
| A. | mechanical tachometer |
| B. | electrical tachometer |
| C. | magnetic pick up |
| D. | none of the above |
| Answer» A. mechanical tachometer | |
| 8. |
flame ionization detector is used for measuring |
| A. | hc |
| B. | co |
| C. | nox |
| D. | co2 |
| Answer» A. hc | |
| 9. |
Chemilumme scene analyzer is used for measuring |
| A. | hc |
| B. | co |
| C. | nox |
| D. | co2 |
| Answer» C. nox | |
| 10. |
Non disprasive infrared analyzer is widely accepted instrument for measuring |
| A. | unburnt hydrocarbon |
| B. | carbon monoxide |
| C. | carbon dioxide |
| D. | nox |
| Answer» B. carbon monoxide | |
| 11. |
If n is the rpm, number of power strokes per minute in a four stroke engine is |
| A. | n/2 |
| B. | n |
| C. | 2n |
| D. | 4n |
| Answer» A. n/2 | |
| 12. |
If n is the rpm, number of power strokes per minute in a two stroke engine is |
| A. | n/2 |
| B. | n |
| C. | 2n |
| D. | 4n |
| Answer» B. n | |
| 13. |
mechanical efficiency 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 to frictional power |
| Answer» C. brake power to indicated power | |
| 14. |
volumetric efficiency is a measure of |
| A. | power of the engine |
| B. | speed of the engine |
| C. | breathing capacity of the engine |
| D. | pressure rise in the cylinder |
| Answer» C. breathing capacity of the engine | |
| 15. |
thermal efficiency varies |
| 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 | |
| 16. |
The spark timing and combustion rate 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 | |
| 17. |
Indicated power is directly proportional to |
| A. | air consumption |
| B. | torque |
| C. | cylinder peak pressure |
| D. | none of the above |
| Answer» A. air consumption | |
| 18. |
The brake thermal efficiency 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 | |
| 19. |
Performance m ep shows |
| A. | indicated power vs speed |
| B. | both vs soeed under various conditions |
| C. | bmep vs piston speed under various condition |
| D. | nth vs speed under various condition |
| Answer» C. bmep vs piston speed under various condition | |
| 20. |
If performance of SI engine of different manufacturer having different capacities size and systems are to be compared, the common parameter would be |
| A. | engine cylinder diameter |
| B. | b.h.p. |
| C. | speed |
| D. | mep |
| Answer» D. mep | |
| 21. |
Endurance test for IC engine is conducted for |
| A. | 100hrs |
| B. | 200 hrs |
| C. | 400 hrs |
| D. | 500 hrs |
| Answer» D. 500 hrs | |
| 22. |
Which of the following factor will not assist in improving thermal efficiency of a CI engine |
| A. | fine atomization and even distribution of fuel |
| B. | minimum heat loss during combustion |
| C. | clear exhaust |
| D. | high surface to volume ratio |
| Answer» D. high surface to volume ratio | |
| 23. |
which statement is correct |
| A. | morse test can be conducted on petrol engine |
| B. | morse test can be conducted on diesel engine |
| C. | conducted only on multicylinder engines |
| D. | none of the above |
| Answer» C. conducted only on multicylinder engines | |
| 24. |
Rope brake dynamometer falls under the category of |
| A. | hydraulic dynamometer |
| B. | transmission type dynamometer |
| C. | torsion type dynamometer |
| D. | mechanical friction type dynamometer |
| Answer» D. mechanical friction type dynamometer | |
| 25. |
Prony brakes are used for testing |
| A. | small engine |
| B. | large capacity engines |
| C. | slow speed engines |
| D. | high speed engines |
| Answer» A. small engine | |
| 26. |
Which of the following is performed for super charging of IC engine? |
| A. | roots blower |
| B. | axial flow compressor |
| C. | sliding vane type compressor |
| D. | reciprocating compressor |
| Answer» B. axial flow compressor | |
| 27. |
From the engine indicator diagram we obtain |
| A. | imep |
| B. | bmep |
| C. | mechanical efficiency |
| D. | relative efficiency |
| Answer» A. imep | |
| 28. |
Most accurate dynamometer is |
| A. | prony brake type |
| B. | hydraulic type |
| C. | swinginf field type |
| D. | eddy current type |
| Answer» C. swinginf field type | |
| 29. |
Most commonly used dynamometer on account of its simplicity of construction is the |
| A. | brake type |
| B. | hydraulic type |
| C. | swinginf field type |
| D. | eddy current type |
| Answer» A. brake type | |
| 30. |
bmep in an engine depends up on its |
| A. | speed only |
| B. | torque only |
| C. | speed and torque |
| D. | speed and power |
| Answer» B. torque only | |
| 31. |
Brake thermal efficiency of SI engine usually varies between |
| A. | 25-30 % |
| B. | 30-60 % |
| C. | 60-80% |
| D. | more than 80 % |
| Answer» A. 25-30 % | |
| 32. |
The brake power is the |
| A. | power available at the output shaft |
| B. | energy developed inside the cylinder block |
| C. | energy lost due to friction |
| D. | none of the above |
| Answer» A. power available at the output shaft | |
| 33. |
The total power developed by the combustion of fuel is |
| A. | bp |
| B. | ip |
| C. | fp |
| D. | none of the above |
| Answer» B. ip | |
| 34. |
Mean effective pressure is the pressure |
| A. | pressure acting on the crank shaft |
| B. | which is acting on the piston throughout the power stroke |
| C. | pressure required to inject the fuel |
| D. | none of the above |
| Answer» B. which is acting on the piston throughout the power stroke | |
| 35. |
Fuel Air ratio is |
| A. | mass of fuel to mass of air |
| B. | reciprocal of air fuel ratio |
| C. | which effects the combustion phenomenon |
| D. | all of the above |
| Answer» D. all of the above | |
| 36. |
specific fuel consumption is |
| A. | amount of fuel consumed per unit power developed per hour |
| B. | amount of fuel consumed per unit indicated power per hour |
| C. | amount of fuel consumed per hour |
| D. | all of the above |
| Answer» A. amount of fuel consumed per unit power developed per hour | |
| 37. |
Heat balance sheet indicates |
| A. | amount of heat energy consumed in the combustion chamber |
| B. | brake up of the total energy input into different parts |
| C. | amount of energy lost through exhaust |
| D. | all of the above |
| Answer» B. brake up of the total energy input into different parts | |
| 38. |
The frictional power is |
| A. | bp + ip |
| B. | bp- ip |
| C. | bp* ip |
| D. | none of the above |
| Answer» B. bp- ip | |
| 39. |
Identify the correct statement |
| A. | power friction means less brake power |
| B. | lower friction means more brake power |
| C. | high friction means high brake power |
| D. | lower friction means high brake specific fuel consumption |
| Answer» B. lower friction means more brake power | |
| 40. |
Willians line method is applicable to |
| A. | si |
| B. | ci |
| C. | both |
| D. | none of the above |
| Answer» A. si | |
| 41. |
The ratio of indicated thermal efficiency to the air std cycle efficiency is called |
| A. | net efficiency |
| B. | efficiency ratio |
| C. | relative efficiency |
| D. | overall efficiency |
| Answer» C. relative efficiency | |
| 42. |
As compare to winter, during summer, volumetric efficiency of IC engine will |
| A. | increase |
| B. | decrease |
| C. | same |
| D. | unpredictable |
| Answer» B. decrease | |
| 43. |
Pick up the wrong statement |
| A. | supercharging reduces knocking in diesel engine |
| B. | there can be limited supercharging in petrol engine because of detonation |
| C. | supercharging at high altitudes is essential |
| D. | supercharging results in to fuel economy |
| Answer» D. supercharging results in to fuel economy | |
| 44. |
The ratio of BP to IP of an engine is |
| A. | thermal effi |
| B. | brake thermal effi |
| C. | mechanical efficiency |
| D. | overall efficiency |
| Answer» C. mechanical efficiency | |
| 45. |
Volumetric efficiency of supercharged engine is |
| A. | 1 |
| B. | cant determine |
| C. | greater than 1 |
| D. | less than 1 |
| Answer» C. greater than 1 | |
| 46. |
volumetric efficiency of naturally aspirated engine is |
| A. | 1 |
| B. | cant determine |
| C. | greater than 1 |
| D. | less than 1 |
| Answer» D. less than 1 | |
| 47. |
The mean effective pressure indicates the |
| A. | maximum pressure developed |
| B. | minimum pressure developed |
| C. | average pressure |
| D. | instanteneous pressure at any instant |
| Answer» C. average pressure | |
| 48. |
The ratio of BMEP to IMEP is called |
| A. | mechanical efiiciency |
| B. | overall efficiency |
| C. | volumetric efficiency |
| D. | indicated thermal effi |
| Answer» A. mechanical efiiciency | |
| 49. |
The powern actually developed by the engine is called |
| A. | theoretical power |
| B. | actual power |
| C. | ip |
| D. | none of the above |
| Answer» C. ip | |
| 50. |
The BP of diesel engine, keeping other parameters constant, can be increased by |
| A. | decreasing the density of intake air |
| B. | incrasing the temperature of intake air |
| C. | increasing the pressure of intake air |
| D. | decreasing the pressure of intake air |
| Answer» C. increasing the pressure of intake air | |
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