Sample Paper-Thermal Engineering and Thermodynamics-Exam Paper, Exams of Thermodynamics

Download Sample Paper-Thermal Engineering and Thermodynamics-Exam Paper and more Exams Thermodynamics in PDF only on Docsity! Thermal Engineering Principles (OPEN BOOK EXAM) Sample of simple questions Q1. Find the rate of heat lost per meter length of a steam carrying pipe with the following information available:  Pipe: ID = 12cm; Thickness = 0.5 cm; Material = Wrought Iron  Insulation: Thickness = 2.5 cm; Material = Mineral Wool  Inner Surface temperature = 800 C  Outer Surface heat transfer coefficient = 5 W/m2-C  Outside Ambient temperature = 20 C Q2. Air flows over a flat parallel plate 1m long, with a velocity of 2m/s. Find the local heat transfer coefficient at a distance of 0.3m from the leading edge of the plate. The plate is isothermal and the film temperature can be assumed to be 400K. Q3. Water is heated while flowing in a circular tube of 2.5 cm inner diameter. The Reynolds number of flow is 2x104. Assuming the bulk temperature to be 80C find the average Nusselt number. Q4. Consider a pipe carrying steam passing from the furnace as shown in the figure below: Furnace The steam enters at 120 C and the furnace is maintained at 1000 C. What additional information do you require to find the outlet temperature of steam “accurately”. What assumptions (and any additional data) can give you a reasonable estimate? docsity.com