试题,发电厂动力部分自考试题,笔记（Test questions, power plants, self test questions, notes）January 2008 national higher education self study examinationPower unit test in power plantCourse Code: 02311A single choice (the title of 15 items, each item of 1 points, a total of 15 points)In the four option of each item listed in only one is in line with the requirements of the subject, please fill in the code in question after the brackets. The wrong choice or not, choose no points.1., the power equipment that converts heat energy into mechanical energy is ()A. boilerB. condenserC. turbineD. generatorThe 3. Rankine cycle fluid in water vapor, complete adiabatic expansion process equipment (is)A. boilerB. turbineC. condenserD. superheater4. in the case of a known fluid species, the fluid Prandtl number is found in the physical table, based mainly on ()A. pressureB. temperatureC. velocityD. pipe diameter5. the utility model adopts the form of a pulverized coal boiler, and the combustion mode belongs to ()A. layer furnaceB. boiling furnaceC. chamber combustion furnaceD. cyclone furnace6. the following statement about swirl burners is wrongA. long rangeB. has an internal pressure return zoneC. large expansion angleD. has tangential velocity7. the following statement about water film dust collector is wrongA. dust removal efficiency is lowB. smoke circulation resistance is bigC. dust collector is compact in structure and small in sizeD. initial investment is large8., in the many factors that affect the boiler operating conditions, belongs to "outside disturbance" is ()A. coal quality changeB. excess air factor changeC. coal fineness changeLoad change of D. turbo generator unit9. the energy conversion of steam in the high pressure cylinder of a multistage turbine is in a series ofProgressively completed in the series of A. stagesB. in series at the same timeThe C. is completed in parallelD. parallel stages are completed simultaneously10. when the steam temperature is constant and the pressure rises, the steam at the end of the turbine ()A. temperature dropB. temperature riseC. humidity decreasesD. humidity increases11. the role of the ejector in the condenser of the turbine is to draw out the condenserA. airB. steamC. steam and air mixtureD. air and other non condensable gases12. a unit with a large rate of change in turbine speed under certain load changesThe A. speed changes little, and its static characteristic is more gentleB. has little change in speed, and its static characteristics are steepC. changes greatly in speed, and its static characteristics are steepThe D. speed changes greatly, and its static characteristics are more gentle13., the factors that have nothing to do with the standard coal consumption rate of power plants are ()A. factory power consumptionComprehensive utilization method of ash in B. power plantC. boiler efficiencyD. turbine internal lossThe method of regulating output of 14. axis Kaplan turbine is to open large (or close)A. driftmeterB. wheel entrance water guide mechanism gateopeningC. inlet valveBlade opening of D. runner15., the factors that have nothing to do with the annual operating costs of hydropower plants areA. annual average generating capacityB. equipment depreciation expenseC. production management feeD. maintenance costs source: examination - self-study examinationTwo, multiple-choice questions (the big topic 5 items, each item of 2 points, a total of 10 points)In the five option of each item listed in the two to five is in line with the requirements of the subject, please fill in the code in question after the brackets. The wrong choice, multiple choice, choose less or not choose no points.16., the first law of thermodynamics should be applied to closed systems, applicable to ()A. ideal gasB. actual gasC. reversible processD. irreversible processE. work medium expansion17., we want to know the state parameter of saturated saturated steam under known pressure. The specific volume VX should be calculated by the relevant parameters. They are ()18. the function of furnace safety monitoring system (FSSS) has ()A. adjust combustionB. balanced ventilationC. coal pulverizing system and combustion system are standardized and ordered to start and stopWhen the D. meets dangerous conditions, the emergency trip is stopped and the combustion supply and boiler operation are stoppedE. adjust flow rate19. the main monitoring items during the normal operation ofthe steam turbine includeInlet pressure and temperature of A. steam turbineB. condenser vacuumVibration of C. unitD. bearings return oil temperatureE. lubricating oil pressure20. for a constant flow, under any conditions, the following statements are correctA. the cross section is a flat surfaceThe flow velocity at each point on the cross section of the B. is not equalC. the flow across each cross section is equalThe average flow velocity of each cross section of D. is unchangedThe flow directions of the points on the cross section of the water E. are parallel to each otherThree, fill in the blanks (the title of 5 items, each item of 2 points, a total of 10 points)Please fill in the correct answer in each item in the blanks. No fill or no fill.21. the same object radiation temperature and wavelength, with maximum radiation force is ___________. It is ___________ blackness.22. according to the structure and arrangement of different boiler air preheater can be divided into ___________ air preheater and air preheater ___________ two types.23. methods to determine the thermal efficiency of the boiler is mainly ______________________ and _____________________.24. in the power plant, in addition to the 1kg steam turbine generator set in __________ eventually converted into_________The share is the absolute electric efficiency of the turbo generator set.The surface heater 25. thermal power plant feedwater heating system in a pressure ___________ heater and heater ___________ two.Four, explain the problem (the title noun 5 items, each item of 3 points, a total of 15 points)26. superheated steam27. temperature field28. the three impulse regulation of boiler feed water29. partial steam admission of turbine stageVolume loss of 30. hydraulic turbineFive, short answer questions (the big topic 5 items, each item of 6 points, a total of 30 points)31. what is the power cycle? Try to draw the P-V diagram and explain it.32. what are the ways to regulate the steam temperature at the flue gas side of the boiler unit?33. why is the temperature of the upper cylinder always higher than the temperature of the lower cylinder when the steam turbine is running?34. briefly describe the tasks of the steam turbine governing system.35. why is it more efficient to install a stern tube than a no tail pipe?Six, analysis problem (the problem consists of 2 items, each item of 10 points, a total of 20 points)36., what is the mode of feed water heat cycle? Why should modern large thermal power plants adopt the water supply heat cyclemode?37., try to analyze why thermal power plant boilers are equipped with automatic soot blowing devices at all levels, and periodically sweep the heating surface, which can improve the thermal efficiency of power plants.。
