MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Power Plant knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the maximum percentage gain in Regenerative feed heating cycle thermal efficiency? |
| A. | increases with number of feed heaters increasing |
| B. | decreases with number of feed heaters increasing |
| C. | remains same unaffected by number of feed heaters |
| D. | none of the mentioned |
| Answer» B. decreases with number of feed heaters increasing | |
| 2. |
In a regenerative feed heating cycle, the greatest economy is affected ___________ |
| A. | when steam is extracted from only one suitable point of steam turbine |
| B. | when steam is extracted from several places in different stages of steam turbine |
| C. | when steam is extracted only from the last stage of steam turbine |
| D. | when steam is extracted only from the first stage of steam turbine |
| Answer» C. when steam is extracted only from the last stage of steam turbine | |
| 3. |
In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating ___________ |
| A. | decreases with increase in Rankine cycle efficiency |
| B. | increases with increase in Rankine cycle efficiency |
| C. | is unaffected by increase in Rankine cycle efficiency |
| D. | none of the mentioned |
| Answer» C. is unaffected by increase in Rankine cycle efficiency | |
| 4. |
Regenerative cycle thermal efficiency ___________ |
| A. | is always greater than simple Rankine thermal efficiency |
| B. | is greater than simple Rankine cycle thermal efficiency only when steam is bled at particular pressure |
| C. | is same as simple Rankine cycle thermal efficiency |
| D. | is always less than simple Rankine cycle thermal efficiency |
| Answer» B. is greater than simple Rankine cycle thermal efficiency only when steam is bled at particular pressure | |
| 5. |
Regenerative heating i.e., bleeding steam to reheat feed water to boiler ___________ |
| A. | decreases thermal efficiency of the cycle |
| B. | increases thermal efficiency of the cycle |
| C. | does not affect thermal efficiency of the cycle |
| D. | may increase or decrease thermal efficiency of the cycle depending upon the point of extraction of steam |
| Answer» C. does not affect thermal efficiency of the cycle | |
| 6. |
In Rankine cycle the work output from the turbine is given by ___________ |
| A. | change of internal energy between inlet and outlet |
| B. | change of enthalpy between inlet and outlet |
| C. | change of entropy between inlet and outlet |
| D. | change of temperature between inlet and outlet |
| Answer» C. change of entropy between inlet and outlet | |
| 7. |
Rankine cycle comprises of ___________ |
| A. | two isentropic processes and two constant volume processes |
| B. | two isentropic processes and two constant pressure processes |
| C. | two isothermal processes and two constant pressure processes |
| D. | none of the mentioned |
| Answer» C. two isothermal processes and two constant pressure processes | |
| 8. |
Rankine efficiency of a steam power plant ___________ |
| A. | improves in summer as compared to that in winter |
| B. | improves in winter as compared to that in summer |
| C. | is unaffected by climatic conditions |
| D. | none of the mentioned |
| Answer» C. is unaffected by climatic conditions | |
| 9. |
Rankine cycle operating on low pressure limit of p1 and high pressure limit of p2 ___________ |
| A. | has higher thermal efficiency than the Carnot cycle operating between same pressure limits |
| B. | has lower thermal efficiency than Carnot cycle operating between same pressure limits |
| C. | has same thermal efficiency as Carnot cycle operating between same pressure limits |
| D. | may be more or less depending upon the magnitudes of p<sub>1</sub> and p<sub>2</sub> |
| Answer» B. has lower thermal efficiency than Carnot cycle operating between same pressure limits | |
| 10. |
Rankine cycle efficiency of a good steam power plant may be in the range of ___________ |
| A. | 15 to 20% |
| B. | 35 to 45% |
| C. | 70 to 80% |
| D. | 90 to 95% |
| Answer» C. 70 to 80% | |