MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Thermal Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the efficiency of an ideal air standard otto cycle if the compression ratio is 7? |
| A. | 51.5% |
| B. | 54% |
| C. | 52.1% |
| D. | 50% |
| Answer» C. 52.1% | |
| 2. |
What is the efficiency of an ideal air standard otto cycle if the clearance volume is 20% of the swept volume? |
| A. | 52.1% |
| B. | 50.1% |
| C. | 55.1% |
| D. | 51.1% |
| Answer» E. | |
| 3. |
In an ideal otto cycle works between minimum and maximum temperature of 300K and 1800K. What is the compression ratio? |
| A. | 4 |
| B. | 6 |
| C. | 8 |
| D. | 5 |
| Answer» C. 8 | |
| 4. |
What is the efficiency of an ideal air standard otto cycle if the clearance volume is 10% of the swept volume? |
| A. | 39.8% |
| B. | 39.2% |
| C. | 61.7% |
| D. | 61.1% |
| Answer» D. 61.1% | |
| 5. |
What is the efficiency of an ideal air standard otto cycle if the compression ratio is 8.5? |
| A. | 67.5% |
| B. | 57.5% |
| C. | 48.5% |
| D. | 47.5% |
| Answer» C. 48.5% | |
| 6. |
For same compression ratio and heat supplied |
| A. | Otto cycle is more efficient |
| B. | Diesel cycle is more efficient |
| C. | Dual cycle is more efficient |
| D. | Both diesel and otto cycle are equally efficient |
| Answer» B. Diesel cycle is more efficient | |
| 7. |
What is the value of working fluid in otto cycle? |
| A. | 1.0 |
| B. | 1.2 |
| C. | 1.4 |
| D. | 1.8 |
| Answer» D. 1.8 | |
| 8. |
The compression ratio (rk) of otto cycle is equal to __________ |
| A. | r<sub>k</sub> = volume of the cylinder at the beginning of the compression/volume of the cylinder at the end of the compression |
| B. | r<sub>k</sub> = volume of the cylinder at the end of the compression/ volume of the cylinder at the beginning of the compression |
| C. | r<sub>k</sub> = clearance volume/ volume of the cylinder at the beginning of the compression |
| D. | r<sub>k</sub> = volume of the cylinder at the end of the compression/clearance volume |
| Answer» B. r<sub>k</sub> = volume of the cylinder at the end of the compression/ volume of the cylinder at the beginning of the compression | |
| 9. |
How the efficiency of SI engine is affected by change in specific heat ratio of working fluid? |
| A. | The efficiency of SI engine increases with increase in specific heat ratio of working fluid |
| B. | The efficiency of SI engine decreases with increase in specific heat ratio of working fluid |
| C. | The efficiency of SI engine increases with decrease in specific heat ratio of working fluid |
| D. | The efficiency of SI engine does not affected by change in specific heat ratio of working fluid |
| Answer» B. The efficiency of SI engine decreases with increase in specific heat ratio of working fluid | |
| 10. |
Which of the following is not a use of gasoline blend like gasoline mixed with tetraethyl lead in internal combustion engine? |
| A. | Increases the octane rating fuel |
| B. | Allows engine to operate at high compression ratio |
| C. | Avoid auto ignition of fuel |
| D. | Allows engine to operate at low compression ratio |
| Answer» E. | |
| 11. |
In otto cycle heat rejection occurs at __________ |
| A. | Reversible constant volume process |
| B. | Reversible constant pressure process |
| C. | Irreversible constant volume process |
| D. | Irreversible constant pressure process |
| Answer» B. Reversible constant pressure process | |
| 12. |
Otto cycle is air standard cycle of _____________ |
| A. | S.I. engine |
| B. | C.I. engine |
| C. | Both SI and CI engine |
| D. | Neither SI nor CI engine |
| Answer» B. C.I. engine | |
| 13. |
An air standard otto cycle consist of ________ |
| A. | One constant pressure process and three adiabatic process |
| B. | One constant pressure process, one constant volume process and two adiabatic process |
| C. | Two constant volume process and two adiabatic process |
| D. | Two constant pressure process and two adiabatic process |
| Answer» D. Two constant pressure process and two adiabatic process | |
| 14. |
What is the efficiency of the otto cycle? |
| A. | 1 ( frac{1}{r^{ -1}} ) |
| B. | 1 r<sup> -1</sup> |
| C. | r<sup> -1</sup> |
| D. | 1 ( frac{1}{r^{ +1}} ) |
| Answer» B. 1 r<sup> -1</sup> | |
| 15. |
Which cycle is idealized cycle for the spark ignition internal combustion engines? |
| A. | Otto cycle |
| B. | Diesel cycle |
| C. | Dual cycle |
| D. | Bryton cycle |
| Answer» B. Diesel cycle | |