Paper-2.pdf

1. Arrange the following fuels in decreasing order of their GCV’s: a) s-q-r-p
2. Which of the following contributes to spluttering of flame at burner tip during combustion of fuel oil? d) ambient air humidity and temperature
3. Which trap is preferred in condensate removal from steam main lines? d) All of the above
4. In an FBC boiler, with low ash fusion coal, if the bed temperature exceeds 950°C, the result is: b) clinker formation
5. Water logging of 3 m lift of condensate, at trap discharge, will result in back pressure of: a) 0.03 kg/cm2
6. When pure hydrogen is burnt with stoichiometric air, percentage CO2 on volume basis, in dry flue gas, will be: c) 0%
7. Heat transfer rate for drying application will be low if we heat with: c) Superheated steam
8. The viscosity of furnace oil will be maximum at which of the following temperatures? a) 40 oC
9. Carpet loss in the context of coal consumers is related to: d) coal storage
10. Thermo-compressor is commonly used for: b) upgrading low pressure steam
11. Latent heat of any vapour at its critical point will be: c) zero
12. The temperature at which, refractory will deform under its own weight, is it’s softening temperature, indicated by: b) Pyrometric Cone Equivalent
13. Which type of the following co-generation system has high heat-to-power ratio? b) back pressure turbine
14. Drain pockets are provided in a steam line for: a) effective removal of line condensate
15. Capillary wick is a part of: c) heat pipe
16. Scale losses in reheating furnaces will: b) increase with excess air
17. Tuyeres is a terminology associated with: d) cupola
18. The low combustion temperature in FBC boilers results in minimal formation of: c) NOx
19. Turn down ratio of a burner is the ratio of: a) maximum to minimum fuel input without affecting optimum excess air levels
20. Dolomite is a type of refractory: b) basic
21. Which of the following is not true of condensate recovery? d) increases boiler blow down
22. Calcium and magnesium bicarbonates present in feedwater fed to a boiler would form: b) alkaline solution
23. In steam systems, the purpose of venting air is because, air is: d) an insulator
24. A bottoming cycle is one in which fuel is used for producing: b) heat primarily followed by byproduct power output
25. A supercritical boiler has parameters beyond critical point, which refers to: a) 221.2 bar (a) pressure and 374.15 0C temperature
26. Of the total volume of natural gas, the main constituent is: a) methane
27. For optimum combustion of fuel oil, O2 percentage in flue gases should be maintained at: a) 2-3 %
28. The draft caused solely by the difference in weight between the column of hot gas inside the chimney and column of outside air is known as: d) natural draft
29. The cogeneration system which has high overall system efficiency is: b) combined cycle
30. When 10 kg of fuel, with 60% carbon, is burnt with theoretical air, the mass of CO2 released will be: d) 22 kg
31. (incomplete question)