MCQOPTIONS
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MCQOPTIONS
This section includes 59 Mcqs, each offering curated multiple-choice questions to sharpen your Power Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Brayton cycle consists of |
| A. | Two reversible isobars and two reversible adiabatic process |
| B. | Two reversible isotherm and two reversible adiabatic process |
| C. | Two reversible isotherm and two reversible isobars process |
| D. | Two reversible adiabatics and one reversible isotherm. one reversible isobaric process |
| Answer» B. Two reversible isotherm and two reversible adiabatic process | |
| 52. |
A single acting two-stage air compressor deals with 4 m3/min of air at 1.013 bar and 15°C with a speed of 250 rpm. The delivery pressure is 80 bar. If the inter cooling is complete, the intermittent pressure after first stage will be |
| A. | 9 bar |
| B. | 8 bar |
| C. | 7 bar |
| D. | 6 bar |
| Answer» B. 8 bar | |
| 53. |
Intercooling and reheating is used to increase the efficiency of the: |
| A. | Brayton cycle |
| B. | Ericsson cycle |
| C. | Otto cycle |
| D. | dual cycle |
| Answer» B. Ericsson cycle | |
| 54. |
In a Rankine cycle, with the maximum steam temperature being fixed form metallurgical considerations, as the boiler pressure increases. |
| A. | the condenser load will increases |
| B. | the quality of turbine exhaust will decrease |
| C. | the quality of turbine exhaust will increase |
| D. | the quality of turbine exhaust will remain unchanged |
| Answer» C. the quality of turbine exhaust will increase | |
| 55. |
Heat supplied (kJ kg-1) to the cycle is |
| A. | 2372 |
| B. | 2576 |
| C. | 2863 |
| D. | 3092 |
| Answer» D. 3092 | |
| 56. |
An open cycle constant pressure gas turbine uses a fuel of calorific value 40,000 kJ/kg, with the air-fuel ratio of 80 : 1 and develops a net output of 80 kJ/kg of air. The thermal efficiency of the cycle is |
| A. | 61% |
| B. | 16% |
| C. | 18% |
| D. | 21% |
| Answer» C. 18% | |
| 57. |
If regeneration is used in Rankine cycle system, under ideal condition efficiency ________ Carnot cycle. |
| A. | will be equal to |
| B. | will be less than |
| C. | will be more than |
| D. | may be more than |
| Answer» B. will be less than | |
| 58. |
Inter-cooling results in |
| A. | improved work ratio |
| B. | lower work ratio |
| C. | unaffected work ratio |
| D. | improved work ratio initially which is lowered subsequently |
| Answer» B. lower work ratio | |
| 59. |
An ideal constant pressure gas turbine works on the ________ cycle. |
| A. | Atkinson |
| B. | Lenoir |
| C. | Stirling |
| D. | Brayton |
| Answer» E. | |