MCQOPTIONS
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MCQOPTIONS
This section includes 12 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. |
For the given values of efficiency, inlet steam pressure and quality of steam, pressure limits can be determined by? |
| A. | Mollier Charts |
| B. | Gantt Charts |
| C. | Mollier & Gantt Charts |
| D. | None of the mentioned |
| Answer» B. Gantt Charts | |
| 2. |
Apart from alloying, name a material that is used instead of ferritic steels to increase the ultimate strength of unalloyed steels. |
| A. | Chromium |
| B. | Molybdenum |
| C. | Austenitic steel |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 3. |
FOR_THE_GIVEN_VALUES_OF_EFFICIENCY,_INLET_STEAM_PRESSURE_AND_QUALITY_OF_STEAM,_PRESSURE_LIMITS_CAN_BE_DETERMINED_BY_??$ |
| A. | Mollier Charts |
| B. | Gantt Charts |
| C. | Both of the mentioned |
| D. | None of the mentioned |
| Answer» B. Gantt Charts | |
| 4. |
Which of these cases will have a higher cycle efficiency? |
| A. | Condenser Pressure= 25 mm of Hg; Cooling Water Temperature= 12 degree Centigrade |
| B. | Condenser Pressure= 50 mm of Hg; Cooling Water Temperature= 27 degree Centigrade |
| C. | Condenser Pressure= 75 mm of Hg; Cooling Water Temperature= 36 degree Centigrade |
| D. | Condenser Pressure= 100 mm of Hg; Cooling Water Temperature= 45 degree Centigrade |
| Answer» B. Condenser Pressure= 50 mm of Hg; Cooling Water Temperature= 27 degree Centigrade | |
| 5. |
Apart from alloying, name a material that is used instead of ferritic steels to increase the ultimate strength of unalloyed steels? |
| A. | Chromium |
| B. | Molybdenum |
| C. | Austenitic steel |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 6. |
What is the percentage drop in the ultimate strength of unalloyed steels when the steam temperature is raised from 400-500 degree Centigrade? |
| A. | 20% |
| B. | 30% |
| C. | 40% |
| D. | 60% |
| Answer» C. 40% | |
| 7. |
What is the effect of increasing steam inlet temperature on turbine internal efficiency? |
| A. | it remains same |
| B. | it increases |
| C. | it decreases |
| D. | none of the mentioned |
| Answer» C. it decreases | |
| 8. |
What is the effect of increasing superheat at constant inlet steam pressure & condenser pressure on mean temperature of heat addition? |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | none of the mentioned |
| Answer» B. decreases | |
| 9. |
What is the effect of increasing superheat at constant inlet steam pressure & condenser pressure on cycle efficiency? |
| A. | Steady decrement in cycle efficiency |
| B. | Steady improvement in cycle efficiency |
| C. | No effect on cycle efficiency |
| D. | None of the mentioned |
| Answer» C. No effect on cycle efficiency | |
| 10. |
An increase in inlet steam temperature ___________ the heat rate. |
| A. | lowers |
| B. | increases |
| C. | does not have any effect on |
| D. | temperature has no significance in heat rate |
| Answer» B. increases | |
| 11. |
What is the relation between cooling water temperature (tc1) & condenser pressure (pc)? |
| A. | tc1 is directly proportional to pc |
| B. | tc1 is directly proportional to 2xpc |
| C. | tc1 is directly proportional to 5xpc |
| D. | tc1 is directly proportional to 6xpc |
| Answer» B. tc1 is directly proportional to 2xpc | |
| 12. |
The cycle efficiency ________________ with the _____________ of condenser pressure. |
| A. | decreases, decrease |
| B. | increases, decrease |
| C. | remains same, decrease |
| D. | does not vary, decrease |
| Answer» C. remains same, decrease | |