西交《电站锅炉原理》在线作业（West to the power boiler principle online operation）.doc

西交《电站锅炉原理》在线作业（West to the power boiler principle online operation） West to the power boiler principle online operation Total score: 100 test time: - Radio examination Judgment question Radio examination questions (40 questions, 80 points) 1. heat transfer deterioration occurs in heated (or) rising tubes. A. weak B. uniform C. strong D. inequality Full marks: 2 2. heating the saturated steam of the boiler to the required superheated steam temperature is A. superheater B. reheater C. economizer D. condenser Full marks: 2 3. the air carrying pulverized coal into the burner is called A. primary air B. two wind C. three wind D. burnout wind Full marks: 2 4., the coefficient of thermal deviation is defined as (). In A. parallel working tube, the ratio of maximum enthalpy increase of medium to minimum enthalpy increase of working medium in a deviation tube In the B. parallel working tube, the ratio of the minimum enthalpy increase of the working medium in the deviation tube to the maximum enthalpy increase of the working medium C. parallel work tube, the ratio of average enthalpy deviation tube refrigerant enthalpy increase with the increase of the quality of pipe group In the D. parallel working tube, the enthalpy increase of the working medium in the deviation pipe and the maximum enthalpy increase of the medium in the whole tube group Full marks: 2 5. theta L = = 273 this formula is the formula for calculating the smoke temperature at the furnace outlet in the furnace thermodynamic calculation. One of the following four symbols considered is the position of the flame center. A. Ta B. sigma o Only C. D. M Full marks: 2 6. when the total heat absorption is constant, the excess heat will be met as the pressure increases Elevated A. B. decrease C. basically unchanged D. rising or decreasing is not necessarily Full marks: 2 7., if the pulverized coal of different coals has the same index of evenness, the maximum R90 of the economic fineness is (). A. anthracite B. coal C. b