西交《传热学》在线作业（West to the heat transfer online homework）.doc

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西交《传热学》在线作业（West to the heat transfer online homework）.doc

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西交《传热学》在线作业（West to the heat transfer online homework） West to the heat transfer online homework Total score: 100 test time: - Radio examination A multiple-choice question Radio examination questions (30 questions, 60 points) 1. the classification principle of steady heat conduction and non steady heat conduction is based on the correlation between heat conduction and (or) heat conduction. A. time B. space C. pressure D. density Full marks: 2 The heat transfer coefficient is 2. 100W/ (m K) convection, the air temperature is 20 DEG C through 50 degrees of wall heat flux, the convective heat transfer (for). A. 10000W/ square meters B. 20000W/ square meters C. 2000W/ square meters D. 3000W/ square meters Full marks: 2 3. dimensionless combination of alpha L/ lambda is used as a criterion for convective heat transfer. A., Nu (Nusselt number) B. Re (Lei Nuo) C. Pr (Prandtl) D. Gr (Guerra Shchev) Full marks: 2 4., in judging whether the iterative process has been convergent, the absolute value of the difference of the maximum value of the region calculated by the two iteration is often used, which is generally considered to be convergent in () range. A. 0.1-0.01 B. 0.001-0.0001 C. 0.0001-0.00001 D. 0.001-0.000001 Full marks: 2 5. in steady heat conduction, the temperature distribution in the object is determined. A. temperature coefficient B. thermal conductivity C. heat transfer coefficient D. density Full marks: 2 The applicable condition of the 6. lumped parameter method is the Biot number. A. 0.1 B. 0.1 C. =0.11 D. = 0.1 Full marks: 2 7. when the pipe is longer than the pipe diameter, the outer tube condensation coefficient of heat transfer is compared with the vertical arrangement. A. across the small B. and they put. C. when placed horizontally D. cannot compare Full marks: 2 8. below is not the phenomenon of a fluid swept through a single tube. A. in a single pipe layman boundary layer B. fluid flow across tube will occur in turbulent flow separation C. in a state