MCQOPTIONS
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MCQOPTIONS
This section includes 27 Mcqs, each offering curated multiple-choice questions to sharpen your Thermodynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Intercooling and regeneration in combination used to increases _________ |
| A. | Net work output |
| B. | Efficiency |
| C. | Doesn’t change net work output and efficiency |
| D. | Both net work output and efficiency |
| Answer» E. | |
| 2. |
Reheat and regeneration in combination used to increases ________ |
| A. | Net work output |
| B. | Efficiency |
| C. | Both net work output and efficiency |
| D. | Doesn’t change net work output and efficiency |
| Answer» D. Doesn’t change net work output and efficiency | |
| 3. |
In how many stages the compression process is divided in intercooling? |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Five |
| Answer» C. Three | |
| 4. |
What is the effect of regeneration in brayton cycle work output? |
| A. | Work output increases |
| B. | Work output decreases |
| C. | Work output becomes zero |
| D. | Work output doesn’t change |
| Answer» E. | |
| 5. |
If regeneration is also used along with reheating the efficiency will _____ |
| A. | Decreases |
| B. | Increases |
| C. | Zero |
| D. | Remain same |
| Answer» C. Zero | |
| 6. |
Reheating will _______ the efficiency of brayton cycle. |
| A. | Decreases |
| B. | Increases |
| C. | Zero |
| D. | Remain same |
| Answer» B. Increases | |
| 7. |
In brayton cycle regenerator is placed between __________ |
| A. | Turbine and heat exchanger |
| B. | Turbine and intercooler |
| C. | Compressor and intercooler |
| D. | Compressor and heat exchanger |
| Answer» E. | |
| 8. |
In a brayton 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» C. First at constant volume then at constant pressure process | |
| 9. |
In a brayton 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» C. First at constant volume then at constant pressure process | |
| 10. |
Which of the following methods cannot be used to increase the efficiency of brayton cycle? |
| A. | Decreasing pressure ratio |
| B. | Increasing pressure ratio |
| C. | Regeneration |
| D. | Heat exchanger |
| Answer» B. Increasing pressure ratio | |
| 11. |
For same maximum pressure and heat input, most efficient cycle is _________ |
| A. | Dual cycle |
| B. | Rankine cycle |
| C. | Brayton cycle |
| D. | Diesel cycle |
| Answer» D. Diesel cycle | |
| 12. |
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 | |
| 13. |
Gas turbine works on _____ |
| A. | Dual cycle |
| B. | Otto cycle |
| C. | Brayton cycle |
| D. | Diesel cycle |
| Answer» D. Diesel cycle | |
| 14. |
A_STEAM_POWER_PLANT_WORKS_ON______AND_A_GAS_TURBINE_WORKS_ON_____?$ |
| A. | both work on Rankine cycle |
| B. | both work on Brayton cycle |
| C. | Brayton cycle, Rankine cycle |
| D. | Rankine cycle, Brayton cycle |
| Answer» E. | |
| 15. |
FOR_BRAYTON_CYCLE,_AVERAGE_SPECIFIC_VOLUME_OF_AIR_THAT_COMPRESSOR_HANDLES_IS______THE_SAME_OF_GAS_IN_A_GAS_TURBINE.?$ |
| A. | equal to |
| B. | more than |
| C. | less than |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 16. |
For the same compression ratio and work capacity, Brayton cycle handles ____ range of volume and ____ range of pressure and temperature than does Otto cycle.$ |
| A. | larger, smaller |
| B. | smaller, larger |
| C. | both are same |
| D. | none of the mentioned |
| Answer» B. smaller, larger | |
| 17. |
Which of the following is more popular for electricity generation?$ |
| A. | gas turbine |
| B. | steam power plant |
| C. | both of the mentioned |
| D. | none of the mentioned |
| Answer» C. both of the mentioned | |
| 18. |
In turbine plants, Otto cycle is more suitable than Brayton cycle. |
| A. | true |
| B. | false |
| Answer» C. | |
| 19. |
Why is Otto cycle more suitable in reciprocating engine field? |
| A. | reciprocating engine field cannot handle large volume of low pressure gas |
| B. | the engine size increases |
| C. | the friction losses become more |
| D. | all of the mentioned |
| Answer» E. | |
| 20. |
In Rankine cycle, working fluid ____ , in Brayton cycle working fluid ___? |
| A. | undergoes phase change, remains in gaseous phase |
| B. | remains in gaseous phase, undergoes phase change |
| C. | undergoes phase change, undergoes phase change |
| D. | remains in gaseous phase, remains in gaseous phase |
| Answer» B. remains in gaseous phase, undergoes phase change | |
| 21. |
Both Rankine cycle and Brayton cycle consists of two reversible isochores and two reversible adiabatics. |
| A. | true |
| B. | false |
| Answer» C. | |
| 22. |
For the same compression ratio, the efficiency of Brayton cycle is ____ the efficiency of Otto cycle. |
| A. | less than |
| B. | equal to |
| C. | greater than |
| D. | none of the mentioned |
| Answer» C. greater than | |
| 23. |
The efficiency of Brayton cycle depends on |
| A. | compression ratio |
| B. | pressure ratio |
| C. | either compression ratio or pressure ratio |
| D. | both compression ratio and pressure ratio |
| Answer» D. both compression ratio and pressure ratio | |
| 24. |
The efficiency of Brayton cycle is given by (rk is the compression ratio) |
| A. | 1/(rk)^(…£-1) |
| B. | 1 – 1/(rk)^(ɣ) |
| C. | 1 – 1/(rk)^(ɣ-1) |
| D. | 1/(rk)^(…£) |
| Answer» D. 1/(rk)^(‚Äö√Ѭ∂¬¨¬£) | |
| 25. |
Which of the following is true for the Brayton cycle? |
| A. | first sir is compressed reversibly and adiabatically |
| B. | heat is added reversibly at constant pressure |
| C. | air expands in turbine reversibly and adiabatically |
| D. | all of the mentioned |
| Answer» E. | |
| 26. |
The Brayton cycle consists of |
| A. | two reversible isotherms and two reversible isobars |
| B. | two reversible isochores and two reversible adiabatics |
| C. | two reversible isotherms and two reversible isochores |
| D. | two reversible isobars and two reversible adiabatics |
| Answer» E. | |
| 27. |
A gas turbine power plant uses |
| A. | Otto cycle |
| B. | Rankine cycle |
| C. | Brayton cycle |
| D. | Diesel cycle |
| Answer» D. Diesel cycle | |