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- Initial condition: P = 0.7 MPax = 96 %Process: ThrottlingFinal condition: P = 0.35 MPaRequired: Δs5. (a) Describe a platinum resistance thermometer. How would you calibrate and use it formeasuring temperature of an object. Mention its advantages over a thermoelectricthermometer. (Please include all the necessary and clear diagrams). (b) Discuss the second law of thermodynamics, entropy, and the principle of increase ofentropy. Show that the entropy of a reversible process remains invariant and it gets increasedin an irreversible process. (Please include all the necessary and clear diagrams).if a 136.51g Al rod (c=0.900 j/g°C) is at 100.0°C and placed into 250.0g of water at 21.8°C, what is the temperature of the system (rod + water) at equilibrum assuming no losses to the surrounding? a) 46°Cb) 30°Cc) 206°Cd) 18°C
- A four-cylinder four-stroke petrol engine with the following specifications: - The bore(diameter) = 20 cm - The stroke = 30 cm - The compression ratio = 8 - The indicated power = 33 KW - The engine speed = 2500 rpm - The indicated thermal efficiency = 35% - The friction power = 25 kW - The calorific value ( heating value) = 42000 kJ/kg . Determine the following: a) The indicated mean effective pressure. b) Thermal efficiency. c) Specific fuel consumption per hour. d) The Torque (given K = 1.4)b ) In a small hydro power station , electricity generation is highly related to the performance of a turbine . Thus , reliability and quality are very crucial . As an example , reliability function , R ( t ) of a turbine represented by the following equation : R ( 1 ) = ( 1-1 / t . ) ² 0≤1≤to Where , to is the maximum life of the blade 1 . Prove that the blades are experiencing wear out . ii . Compute the Mean Time to Failure ( MTTF ) as a function of the maximum life . iii . If the maximum life is 2000 operating hours , determine the design life for a reliability of 0.90SolveSample Problem 4.1.All remain as presented, except for the following changes.The factor ofsafety is now 2, and not 3.As Presented, the thickness of the tube is uniform. In the new one that you are solving,let the thicknessesof the top and bottom be the same,ttb, and the thicknesses of theleft and right be the same,tlr.Theheightand the width of the tube are still respectively 5 in and 3.25 in.As you make thesethickness changes,you are to keep thetotal mass of the tube unchanged. Answer the same questions (a) and (b).Explain your findings
- Show step by step solution. Use Mpa unit Sn = 7Problem 1: A certain rigid aluminum container contains a liquid at a gauge pressure of P0 = 2.02 × 105 Pa at sea level where the atmospheric pressure is Pa = 1.01 × 105 Pa. The volume of the container is V0 = 2.15 × 10-4 m3. The maximum difference between the pressure inside and outside that this particular container can withstand before bursting or imploding is ΔPmax = 2.41 × 105 Pa.For this problem, assume that the density of air maintains a constant value of ρa = 1.20 kg / m3 and that the density of seawater maintains a constant value of ρs = 1025 kg / m3. Part (a) The container is taken from sea level, where the pressure of air is Pa = 1.01 × 105 Pa, to a higher altitude. What is the maximum height h in meters above the ground that the container can be lifted before bursting? Neglect the changes in temperature and acceleration due to gravity with altitude. Part (c) Choose the correct answer from the following options. The depth below the surface of the ocean…An engine cylinder has a compression ratio (r) of 7.5, a clearance volume of 35 cm3 and a piston stroke length of 325 mm. What is the bore diameter in millimetres (mm) for the engine cylinder to the nearest mm.
- 7.10 A rigid bar is suspended by three equally spaced wires of equal length. Theouter wires are steel and are 2 mm in diameter, the centre wire is copper andis 5 mm in diameter. If the weight of the rigid bar is 2,25 kN, calculate the loadcarried by each wire. If the temperature of the system is now raised by 90 °C, what will the magnitude and nature of the resultant stresses set up in the steeland copper wires be. (Let EST = 200 GPa; Ecu = 100 GPa; aST = 12 x 10_6/°C;acu = 18 x 10-6/°C?)MN = 48 SN = 79 (1&3) with thickness of 7.5mmIn the United States, energy for household heating is generally sold using English units, e.g., therm, gal, and cord. A house in Wisconsin uses 1200 therms of thermal energy during the heating season. Calculate the cost of fuel if the furnace uses (a) natural gas with an efficiency of 70%; (b) No. 2 fuel oil, efficiency 65%; (c) kerosene, efficiency 99.9% (unvented); and (d) wood with l5% moisture with an efficiency of 50%. Use the data in Tables 2.2, 2.7, and 2.13. The efficiencies are based on the HHV. Assume the cost of natural gas is $8/MBtu, the cost of No. 2 fuel oil is $3/gal, the cost of kerosene is $3.50/gal, and the cost of wood is $100/cord. Assume the bulk density of cord wood is 30 lbm/ft3 .