Q12) Derive an expression for the overall heat transfer coefficient (U) for one layer plane with convection heat transfer from both sides?
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A: Yes it is true, In graphical solution, the second vector should be drawn fron the end of first…
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A: GIVEN DATA- A MCQ GIVEN ABOUT VECTOR
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Q: The pulley system below is in static equilibrium, where load W3 is 730 N, angle a = 500 and angle 0…
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Q: 15 30
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Q: The Pythagorean theorem can not be applied in case of right angle triangle. O True O False
A: GIVEN DATA- A TRUE FALSE QUESTION GIVEN ABOUT PYTHAGOREAN THEOREM
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A: This can be explained using the sine rule.
Q: According to the Figure 2, the Q vector component can be calculated as: * Figure 2: R a Br
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Q: 5. Derive expressions for a simple Voigt element in the following experiments: (a) Creep experiment:…
A: Solution: Given Data: A Voigt Element. To Find: (a) J(t) (b) E(t) (c) σ(t)
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Q: In the Figure 1, the resultant R can be found by using the law of cosines as: * Figure 1: R (A) R? =…
A: GIVEN DATA- A MCQ GIVEN ABOUT RESULTANT OF FORCE
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Q: Find the Poissons ratio of E=2 K
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A: Dry air does not contain water vapor,
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Q: A pelton wheel working under a head of 50 meters, develops 80 kW at 230 rpm. Calculate the diameter…
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Q: According to the Figure 2, if P = 60 N and Q = 75 N, then R should be: * Figure 2: a 92 N 94 N 96 N…
A: GIVEN DATA- P=60N Q=75N WE HAVE TO FIND R=?
Q: In the Figure 2, the resultant R can be found as: Figure 2: R R? = P2 + Q? True O False P.
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A: It is true that the triangles can be divided into two kinds; right angle and not right angle.
Q: Q16) The thermal resistance of one layer plane wall is: C) (I/ri -- 1/r.) /4k A) AXKA B) In(r.…
A: This question is based on the concept of heat transfer and conduction.
Q: Q2) The flow-metering device shown consists of a stagnation probe at station 2 and a static pressure…
A: Air density, ρair=1.2 kg/m3Manometer reading, ∆h=13.7 cm=0.137 mManometric fluid =WaterV2=4*V1
Q: Q2) The flow-metering device shown consists of a stagnation probe at station 2 and a static pressure…
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Q: According to the Figure 2, if P = 60 N and R = 100 N, then e should be:
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Q: In the Figure 1, if Q= 40 N, P = 50 N, and B = 145°, then R is equal to: %3D Figure 1: R B. O 80 N…
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Q: A pipe of diameter 300 mm and length 3500 m is used for the transmission of power by water. The…
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Q: The pulley system below is in static equilibrium, where load W3 is 730 N, angle a = 50° and angle 0…
A: Given , W3=730N, Calculate W1/W2
Q: Q2) The flow-metering device shown consists of a stagnation probe at station 2 and a static pressure…
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Q: 1. For the system shown, the spring constantk = 400 kN/m, damping coefficient zeta = 0.5 and the…
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Q: PROBLEMS 5.16, 5.17 Draw the shear and bending- moment diagrams for the beam and loading shown, and…
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- A thin-wall jacketed tank heated by condensing steam at one atmosphere contains 91 kg of agitated water. The heat transfer area of the jacket is 0.9m2 and the overall heat transfer coefficient U=227W/m2K based on that area. Determine the heating time required for an increase in temperature from 16C to 60C.The handle of a ladle used for pouring molten lead is 30 cm long. Originally the handle was made of 1.9cm1.25cm mild steel bar stock. To reduce the grip temperature, it is proposed to form the handle of tubing 0.15 cm thick to the same rectangular shape. If the average heat transfer coefficient over the handle surface is 14 W/m K, estimate the reduction of the temperature at the grip in air at 21C.2.43 A turbine blade 6.3 cm long, with cross-sectional area and perimeter , is made of stainless steel . The temperature of the root, , is . The blade is exposed to a hot gas at , and the heat transfer coefficient is K. Determine the temperature of the blade tip and the rate of heat flow at the root of the blade. Assume that the tip is insulated.
- One end of a 0.3-m-long steel rod is connected to a wall at 204C. The other end is connected to a wall that is maintained at 93C. Air is blown across the rod so that a heat transfer coefficient of 17W/m2 K is maintained over the entire surface. If the diameter of the rod is 5 cm and the temperature of the air is 38C, what is the net rate of heat loss to the air?3.16 A large, 2.54-cm.-thick copper plate is placed between two air streams. The heat transfer coefficient on one side is and on the other side is . If the temperature of both streams is suddenly changed from 38°C to 93°C, determine how long it takes for the copper plate to reach a temperature of 82°C.Water at a temperature of 77C is to be evaporated slowly in a vessel. The water is in a low-pressure container surrounded by steam as shown in the sketch below. The steam is condensing at 107C. The overall heat transfer coefficient between the water and the steam is 1100W/m2K. Calculate the surface area of the container that is required to evaporate water at a rate of 0.01 kg/s. Problem 1.16
- 3.10 A spherical shell satellite (3-m-OD, 1.25-cm-thick stainless steel walls) re-enters the atmosphere from outer space. If its original temperature is 38°C, the effective average temperature of the atmosphere is 1093°C, and the effective heat transfer coefficient is , estimate the temperature of the shell after reentry, assuming the time of reentry is 10 min and the interior of the shell is evacuated.An electronic device that internally generates 600 mW of heat has a maximum permissible operating temperature of 70C. It is to be cooled in 25C air by attaching aluminum fins with a total surface area of 12cm2. The convection heat transfer coefficient between the fins and the air is 20W/m2K. Estimate the operating temperature when the fins are attached in such a way that (a) there is a contact resistance of approximately 50 K/W between the surface of the device and the fin array and (b) there is no contact resistance (in this case, the construction of the device is more expensive). Comment on the design options.2.7 A very thin silicon chip is bonded to a 6-mm thick aluminum substrate by a 0.02-mm thick epoxy glue. Both surfaces of this chip-aluminum system are cooled by air at , where the convective heat transfer coefficient of air flow is . If the heat dissipation per unit area from the chip is under steady-state conditions, draw the thermal circuit for the system and determine the operating temperature of the chip.
- You are asked to design a metal hot dog holder for roasting hot dogs over an opencampfire. The holder is to be designed such that while the end holding the hot dogbecomes cherry red (1400oF), the other end can still be held without using aninsulated handle or glove (~95oF). Design it such that it can be used even on awarm, still day, Tf = 90oF (Assume the convective heat transfer coefficient, h, fora horizontal cylinder is uniform over the whole cylinder and equal to 4.0Btu/hrft2oF)A bar with surface temperature (310) oC and diameter (9.5) mm, temperature 20oC and heat convectionIt is contained in a fluid with a coefficient of 95 W / m2K. The top of this bar is heat conductionIt is desired to be coated with bakelite with a coefficient of 2.5 W / mK up to the critical radius thickness.a) the critical radius of the bakelite coating and the heat transfer at the critical radius per unit length.Found it. b) heat transitions per unit length for uninsulated and bakelite (insulation) coated rodYou calculate. Comment the results(h) A single-glazed glass window pane is an arched shape, consisting of a semicircle of radius 0.5 m on top of a rectangle 1.0 m wide by 2.0 m high, with no joints. The glass pane is 5 mm thick. One side of the window is exposed to air at 20°C and the other side is exposed to air at 5°C. Assuming convective heat transfer on both sides of the window, and conduction through it, determine the total thermal resistance of the window pane and hence the rate of heat transfer through it. (Convection: h = 15 W/m²K; Glass: k = 1.1 W/mK)