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Power plant power generation course recruitment examination questions (heat engine)

Fill in the blanks: (20%, 0.5 point for each blank)

1 Several basic thermodynamic processes of ideal gas are isobaric process, isovolumic process, isothermal process and adiabatic process. At a certain temperature, the resistance of the conductor is directly proportional to the length of the conductor and inversely proportional to the cross-sectional area of the conductor, and

Related to the material of the conductor.

The heat absorbed or released by a substance with unit mass when the temperature rises or falls by 65438 0℃ is called the heat of the substance. The heat transfer process of boiler water wall is: flue gas is carried out on the outer wall of the tube, the outer wall of the tube is carried out on the inner wall of the tube, and it is carried out between the inner wall of the tube and the steam-water mixture.

The function of air preheater is to use boiler to heat and burn.

Steam turbine is a kind of rotating prime mover which uses steam with a certain temperature and pressure as working medium and converts energy into energy.

The main protection of large steam turbines generally includes overspeed protection, differential lift protection and high vibration protection.

The process of changing a substance from a liquid state to a gas state is called vaporization, and the phenomenon of changing a substance from a gas state to a liquid state is called liquefaction.

9 The most basic working unit of a steam turbine consisting of a row of nozzles or diaphragm static cascades and a row of moving cascades is called a steam turbine stage. The main performance parameters of 10 pump are head, flow, speed, shaft power and efficiency.

1 1 determines the economic fineness of pulverized coal mainly because of the grindability coefficient of coal and the dry ash-free volatile matter of pulverized coal. The most commonly used fans in 12 thermal power plant are mainly centrifugal fans and axial fans.

13 steam temperature characteristics of boiler convection superheater in power plant are: steam temperature when load increases.

14 Three-impulse feedwater automatic regulating system of drum boiler has three signals: steam flow, feedwater flow and drum water level.

15 the data form of computer control system of thermal power unit includes analog quantity, switching quantity, digital quantity and pulse quantity. 16 The international unit of energy is joule. The international unit of power is Watt (symbol W). 17 translate the following power plant equipment into English:

Pump condenser generator valve turbine economizer

True or false: (30%, 65438+ 0 point for each question)

The current flowing through each resistor in the 1 () series circuit is the same. 2 (X) The higher the liquid level pressure, the faster the liquid evaporates. 3 () The lower the superheat degree of superheated steam, the closer to saturation.

4 (X) The water level gauges on steam drums and various containers are made by using the principle of communication devices.

5 () Absolute pressure is equal to gauge pressure plus atmospheric pressure. Vacuum is the difference between atmospheric pressure and absolute pressure. 6 () Any object with temperature difference must have heat transfer.

7 () The purpose of periodic soot blowing on the heating surface of the boiler is to reduce the wall temperature difference of the heating surface. 8 (X) The low temperature corrosion of the heating surface at the tail of the boiler is mainly due to the corrosion of water. 9 (X) The carbon in power plant coal is the substance with the highest calorific value. 10 () The lower the melting point of coal ash in power plant, the easier it is to cause slagging on the heating surface.

1 1

(10) Internal losses of steam turbines include throttling losses of steam inlet mechanism, pressure losses of exhaust pipes and internal losses.