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. |
Determine the value of cutoff ratio if compression ratio and expansion ratio is equal to 15 and 11 respectively. |
| A. | 1.4 |
| B. | 1.36 |
| C. | 1.5 |
| D. | 1.3 |
| Answer» C. 1.5 | |
| 2. |
Determine the value of expansion ratio if compression ratio and cutoff ratio is equal to 15 and 1.4 respectively. |
| A. | 10.5 |
| B. | 21 |
| C. | 11 |
| D. | 10.7 |
| Answer» E. | |
| 3. |
What is the relation between compression ratio, cutoff ratio and expansion ratio? |
| A. | r<sub>e</sub> = r |
| B. | r<sub>e</sub> = /r |
| C. | r<sub>e</sub> = 1/ r |
| D. | r<sub>e</sub> = r/ |
| Answer» E. | |
| 4. |
What is the efficiency of dual cycle if compression ratio and cut-off ratio is equal to 13 and 1.4 respectively? |
| A. | 68% |
| B. | 63% |
| C. | 60% |
| D. | 65% |
| Answer» C. 60% | |
| 5. |
The cut-off ratio ( ) of dual cycle is equal to ________ |
| A. | Volume at which fuel supply cutoff to volume at which fuel supply start |
| B. | Volume at which fuel supply throughout the process to volume at which fuel supply cutoff |
| C. | Volume at which fuel supply cutoff to volume of fuel supply throughout the process |
| D. | Volume at which fuel supply start to volume at which fuel supply cutoff |
| Answer» B. Volume at which fuel supply throughout the process to volume at which fuel supply cutoff | |
| 6. |
The compression ratio (r) of dual cycle is equal to ________ |
| A. | r = volume of the cylinder at the beginning of the compression/volume of the cylinder at the end of the compression |
| B. | r = volume of the cylinder at the end of the compression/ volume of the cylinder at the beginning of the compression |
| C. | r = clearance volume/ volume of the cylinder at the beginning of the compression |
| D. | r = volume of the cylinder at the end of the compression/clearance volume |
| Answer» B. r = volume of the cylinder at the end of the compression/ volume of the cylinder at the beginning of the compression | |
| 7. |
What is the value of working fluid in dual cycle? |
| A. | 1.0 |
| B. | 1.2 |
| C. | 1.4 |
| D. | 1.8 |
| Answer» D. 1.8 | |
| 8. |
What is the efficiency of dual cycle if compression ratio and cut-off ratio is equal to 15 and 1.4 respectively? |
| A. | 91% |
| B. | 90.8% |
| C. | 90.6% |
| D. | 90% |
| Answer» E. | |
| 9. |
Most high speed compression ignition operates on ________ |
| A. | Diesel cycle |
| B. | Otto cycle |
| C. | Brayton cycle |
| D. | Dual cycle |
| Answer» E. | |
| 10. |
In a dual cycle heat addition takes place ________ |
| A. | At constant volume process |
| B. | At constant pressure process |
| C. | First at constant volume then at constant pressure process |
| D. | First at constant pressure then at constant volume process |
| Answer» D. First at constant pressure then at constant volume process | |
| 11. |
In a dual cycle heat rejection takes place ______ |
| A. | At constant volume process |
| B. | At constant pressure process |
| C. | First at constant volume then at constant pressure process |
| D. | First at constant pressure then at constant volume process |
| Answer» B. At constant pressure process | |
| 12. |
Dual cycle consist of __________ |
| A. | Two constant pressure and two adiabatic process |
| B. | Two constant volume and two adiabatic process |
| C. | One constant pressure process, two constant volume process and two adiabatic process |
| D. | One constant pressure process, one constant volume process and two adiabatic process |
| Answer» D. One constant pressure process, one constant volume process and two adiabatic process | |
| 13. |
What is the efficiency of dual cycle? |
| A. | 1- ( frac{( ^ r_p-1)}{(r_p-1)+ r_p ( -1)} ) |
| B. | 1- ( frac{1}{r^{ -1}} frac{( ^ r_p-1)}{(r_p-1)+ r_p} ) |
| C. | 1- ( frac{1}{r^ } frac{( ^ r_p-1)}{(r_p-1)+ r_p ( -1)} ) |
| D. | 1- ( frac{1}{r^{ -1}} frac{( ^ r_p-1)}{(r_p-1)+ r_p ( -1)} ) |
| Answer» E. | |
| 14. |
Dual cycle is combination of__________ |
| A. | Stirling and diesel cycle |
| B. | Otto and diesel cycle |
| C. | Stirling and otto cycle |
| D. | Otto and Brayton cycle |
| Answer» C. Stirling and otto cycle | |
| 15. |
What is the other name of dual cycle? |
| A. | Mixed cycle |
| B. | Otto cycle |
| C. | Diesel cycle |
| D. | Joule Cycle |
| Answer» B. Otto cycle | |