MCQOPTIONS
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MCQOPTIONS
This section includes 32 Mcqs, each offering curated multiple-choice questions to sharpen your Uncategorized topics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The mean effective pressure indicates the |
| A. | maximum pressure developed |
| B. | minimum pressure developed |
| C. | average pressure |
| D. | instanteneous pressure at any instant |
| Answer» D. instanteneous pressure at any instant | |
| 2. |
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» D. decreasing the pressure of intake air | |
| 3. |
Willians line method is applicable to |
| A. | si |
| B. | ci |
| C. | both |
| D. | none of the above |
| Answer» B. ci | |
| 4. |
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» D. single and multi cylinder si & ci engine | |
| 5. |
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» C. any engine at particular speed | |
| 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» D. 10 | |
| 7. |
Chemilumme scene analyzer is used for measuring |
| A. | hc |
| B. | co |
| C. | nox |
| D. | co2 |
| Answer» D. co2 | |
| 8. |
Non disprasive infrared analyzer is widely accepted instrument for measuring |
| A. | unburnt hydrocarbon |
| B. | carbon monoxide |
| C. | carbon dioxide |
| D. | nox |
| Answer» C. carbon dioxide | |
| 9. |
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» B. n | |
| 10. |
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» C. 2n | |
| 11. |
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» C. 60-80 | |
| 12. |
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» D. nth vs speed under various condition | |
| 13. |
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» E. | |
| 14. |
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» E. | |
| 15. |
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» C. sliding vane type compressor | |
| 16. |
From the engine indicator diagram we obtain |
| A. | imep |
| B. | bmep |
| C. | mechanical efficiency |
| D. | relative efficiency |
| Answer» B. bmep | |
| 17. |
The frictional power is |
| A. | bp + ip |
| B. | bp- ip |
| C. | bp* ip |
| D. | none of the above |
| Answer» C. bp* ip | |
| 18. |
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» B. energy developed inside the cylinder block | |
| 19. |
As compare to winter, during summer, volumetric efficiency of IC engine will |
| A. | increase |
| B. | decrease |
| C. | same |
| D. | unpredictable |
| Answer» C. same | |
| 20. |
volumetric efficiency of naturally aspirated engine is |
| A. | 1 |
| B. | cant determine |
| C. | greater than 1 |
| D. | less than 1 |
| Answer» E. | |
| 21. |
The total power developed by the combustion of fuel is |
| A. | bp |
| B. | ip |
| C. | fp |
| D. | none of the above |
| Answer» C. fp | |
| 22. |
Brake thermal efficiency of SI engine usually varies between |
| A. | 25-30 % |
| B. | 30-60 % |
| C. | 60-80% |
| D. | more than 80 % |
| Answer» B. 30-60 % | |
| 23. |
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» B. amount of fuel consumed per unit indicated power per hour | |
| 24. |
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» D. overall efficiency | |
| 25. |
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» E. | |
| 26. |
The ratio of BP to IP of an engine is |
| A. | thermal effi |
| B. | brake thermal effi |
| C. | mechanical efficiency |
| D. | overall efficiency |
| Answer» D. overall efficiency | |
| 27. |
The powern actually developed by the engine is called |
| A. | theoretical power |
| B. | actual power |
| C. | ip |
| D. | none of the above |
| Answer» D. none of the above | |
| 28. |
The ratio of BMEP to IMEP is called |
| A. | mechanical efiiciency |
| B. | overall efficiency |
| C. | volumetric efficiency |
| D. | indicated thermal effi |
| Answer» B. overall efficiency | |
| 29. |
Most accurate dynamometer is |
| A. | prony brake type |
| B. | hydraulic type |
| C. | swinginf field type |
| D. | eddy current type |
| Answer» D. eddy current 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» C. speed and torque | |
| 31. |
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» B. hydraulic type | |
| 32. |
Motoring test is carried out on an IC engine to determine |
| A. | bp |
| B. | ip |
| C. | fp |
| D. | none of the above |
| Answer» D. none of the above | |