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Steam and Gas Turbines Practice Test: Turbine Thermodynamics and Efficiency
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Avg score: 61% Most missed: “In ideal gas turbine isoentropic and isobaric process takes place.”
Turbine Thermodynamics and Efficiency topics include: Basics of thermodynamics, carnot, rankine and reheat cycles, temperature and pressure effect on cycle efficiency, heat and steam rate, sterling cycle, ericsson cycle, intercooling, reheating and regeneration. Turbine efficiency is the ratio of the turbine's actual work output to the net input energy. It's also known as the power coefficient.  The efficiency of an ideal turbine would be 100%, meaning it would convert all input energy into output work without losing energy to heat or other forms. However, this is not possible due to... Show more
Steam and Gas Turbines Practice Test: Turbine Thermodynamics and Efficiency
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25 Questions

1. In a steam turbine power plant, the boiler feedwater temperature is marked as 30 deg C, ocean as sink with temperature 20 deg C and desired thermal efficiency of the plant is 0.46. Find the temperature of steam entering the turbine?
2. During overload of turbines __________ are used.
3. Effectiveness can be defined as _________
4. Heat rate deviation can be defined as _______
5. How is it advantageous to expand steam at 250 deg C in a turbine as compared to expanding saturated steam in similar turbine?
6. The cycle of evaporation and rain in nature can be assumed to be a kind of Carnot cycle. If ocean water instead of evaporation are boiled by the heat of Sun at a constant temperature of 100 deg C and the condensation of steam into water droplets within the clouds occur at constant temperature of -20 deg C. Find the thermal efficiency of Carnot cycle of nature?
7. When boiler pressure is increased __________
8. Compression can be taken place by _____________
9. Internal combustion chamber is used in _______ Brayton cycle.
10. When is emergency governing used?
11. In ideal gas turbine isoentropic and isobaric process takes place.
12. Brayton cycle is also known as __________
13. Heat rate can be used to find annual fuel costs.
14. When boiler pressure is increased efficiency is ____________
15. To increase plant efficiency heat rate is to be _________
16. In actual gas turbine, mechanical energy is converted into heat by _________
17. Generally, water is used as working fluid in rankine cycle.
18. What is the use of reheat cycle in steam turbines?
19. Steam flow rate can be calculated by _______
20. A combustion chamber in gas turbine is present in between upstream compressor and down stream turbine.
21. What does fluid to fuel efficiency mean?
22. Steam turbines work on __________
23. When lubrication is failed _____________ is used.
24. A researcher during an experiment found that mean temperature of heat addition and heat rejection for a steam power plant operating on a Carnot cycle is 127 deg C and 27 deg C respectively. Later, he calculated the thermal efficiency of the steam cycle. Can you predict what was it?
25. Stirling cycle can also be categorized as ________