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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. Isoentropic compression requires maximum work.
2. Gas turbines work on ___________
3. Ideal Brayton cycle consists of ________
4. When condenser pressure is lowered efficiency _________
5. Generally, water is used as working fluid in rankine cycle.
6. Heat rate defines how much energy is to be expanded for obtaining a unit of useful work.
7. Actual Brayton cycle works on _________
8. Why is steam turbine governing used?
9. Compression can be taken place by _____________
10. In a newly developed innovative idea brought up by CSIR in India, gas turbine exhaust gas are being utilized to convert feedwater into steam. Certain data of the experiment are as follows: mass flow rate of exhaust gas = 40 kg/hr, enthalpy of exhaust gas at the time of their exit from gas turbine is 600 kJ/kg, steam turbine output as measured by brake dynamometer = 60 hp-sec, thermal efficiency of steam power plant is 0.25, efficiency of exhaust gas in converting feedwater into steam is taken as 50%. Find the enthalpy of exhaust gas remaining after they generate steam from feedwater?
11. Extra cooling can be done by __________
12. How is it advantageous to expand steam at 250 deg C in a turbine as compared to expanding saturated steam in similar turbine?
13. Generally effectiveness of regenerators are ___________
14. Why does Carnot cycle has maximum efficiency?
15. Using of intercooler and reheating process ________ efficiency.
16. Heat rate losses that can be directly effected by actions of operators is called ______
17. 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?
18. A combustion chamber in gas turbine is present in between upstream compressor and down stream turbine.
19. By two stage compression work output from turbine is _______
20. When equal pressure ratio are maintained at two stages the work output _______
21. Brayton cycle is also called an Ericsson cycle.
22. What does fluid to fuel efficiency mean?
23. Compression process that takes place in Stirling engine is _________
24. Stirling cycle can also be categorized as ________
25. When boiler pressure is increased efficiency is ____________