Human Factors Engineering Q1)what is Illuminance of a light source on a point that is placed 4 meter away from light source with intensity 50 cd, the angle is zero ? A) cd / meter2 3.125 B) cd / mter 3,5 C) Im / meter2 1.252 D)None of the above Q2) which of the following has high efficiency. A) Light bulb B) fluorescent tube C) Mercury lamp D) tungsten bulb

Q: %3D A furnace is to be built with a layer of firebrick (k = 1.50 W/m-K) on the inside. This is…

A: Given: k1=1.5 Wm.K; T1=1200 °C; T2=70 °Ck2=0.15 Wm.K; L2=0.2 m k3=1 Wm.K; L3=0.15 mgiven that the…

Q: be black-anodized and thus to have an effective emissivity of 0.90. Note that in radiation…

A: I already do that question so I know question 6.9. this is given below

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A: Given that, The volumetric flow rate of gas Q = 100 m3h Space between two plates = 10 cm Height of…

Q: The rate of heat loss from a tank to the surrounding by convection and conduction is expressed by:…

A: Given Equation; qA=0.7∆T1.27(Do)0.27where;q=rate of heat loss, Btu/hrA=Area of tank surface,…

Q: A cylindrical shape is with diameter of 1.2m and length of 1.2m. The top surface has an emissivity…

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Q: a) Identify whether the following statements are true or false. Justify your answer with a proof or…

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Q: Consider a thin-walled, metallic tube of length L = 1 m and inside diameter D; = 3 mm. Water enters…

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Q: Solid sphere made from steel metal with 20 mm diameter and steel cylinder with diameter of 10 mm and…

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Q: A food product with 73% moisture content in a 7 cm diameter can wants to be frozen. The density of…

A: Given that: Thickness of the food product, a= 7 cm = 0.07 m ( since 1 cm = 0.01 m) Freezing…

Q: There are a quite high numbers of strawberries farm at the north of Iran. They classify the…

A: (i)   Let the big strawberry be represented as ‘B’, small strawberry as ‘S’, red strawberry as ‘R’,…

Q: spherical tank with a diameter of 10 cm should be maintained at a constant temperature of 1°C, and…

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Q: A 20-cm diameter cylindrical enclosed pan is placed on top of a heating unit for vaporizing propane…

A: Given:The diameter of the pan Vapor pressure of propane The heat flux Surface temperature of the…

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Q: (1) An asbestos pad is rectangle in cross section, measuring 3 cm x 10 cm on a side at its small…

A: To determine the temperature at the center of the wire (Tmax) and the convective heat transfer…

Q: A solar car has a roof dimensions of 153cm x 80cm for solar cells . Calculate the electrical power…

A: Givenroof dimensions of solar car=153 cm×80 cmlight intensity=920 W/m2energy loss=86%To…

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Q: Q5.Determine the total resistance of the parallel elements in Fig. 5. RT R60 R2 n R60 R43720 R60 :9Ω…

A: Given, The network of parallel resistors.

Q: Q3 A Wire 12 mm in diameter is to be insulated to maximize its current carrying capacity. For…

A: Note: We are authorized to answer one question at a time, since you have not mentioned which…

Q: Consider a medium in which the heat conduction equation is given its simplest prm as

A: Given the heat conduction equation of a system in its simplest form To answer questions a to d about…

Q: Q4: A 2mm-diameter and 10-m-long electric wire is tightly wrapped with a 1-mm-thick plastic cover…

A: Given data are as follows: Diameter of electric wire d = 2 mm Length of electric wire L = 10 m…

Q: You are asked to analyze a cubic enclosure of side length 750mm that will be used in…

A: Note:We are authorized to answer three subparts at a time, since you have not which subparts you are…

Q: A core was mounted in a gas permeameter to measure permeability, and the following laboratory data…

A: Given data: Diameter of core = 2.59 cm Length of core = 6.03 cm Gas viscosity = 0.0148 cP Pressure…

Q: Q/ The heat transfer rate q over a surface is given by dT 9 = -KA= dy where k = thermal conductivity…

A: Given  K = 0.0125 J/ s .m. k Area  A = 2.5 m2 At y = 1.5

Q: Q3:Soild wire 4 mm dia, k= 120 W/mK and 2m lenght, is subjected to 20 Amp current and 220 volt. Heat…

A: The movement of heat across the border of the system due to a difference in temperature between the…

Q: A house has a composite wall of plywood, fiberglass insulation, and plaster board, as indicated in…

A: Inside temperature (Ti) = 20°c  Outside temperature (To) = - 15°c  Inside heat transfer coefficient…

Q: The surface temperature of asphalt (& = 0.93) pavements during hot summer days is approximately 50C.…

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Q: If the overall heat transfer coefficient in question 3 above is 27 W/m²-K find the heat loss per…

A: Given data are as follows: Overall heat transfer coefficient h = 27 W/m2-K Temperature of hot oil =…

Q: Passing a beam of monochromatic light through a cell containing a colored solution absorbs 60% of…

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Q: A sphere of diameter 25 cm made up of copper (k = 220 W/mK) is to be insulated with rubber (k = 0.15…

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Q: PDO engineers and technicians are trying to solve the problem of fouling in heat exchangers. With…

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Q: A 3 meter tall aluminum tank with a 7 meter diameter is completely filled with ethanol. The empty…

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Q: 1-determine the thickness of the asbestos layer at the critical insulation radius 2-calculate the…

A: Given that  Diameter,D1 =2.5 cm Wall thickness =2mm convection coefficient on the outside = 10 w/m2c…

Q: Chemical processes -200 W/m. K. If the temperature profile is assumed as follows: -- =e-mx Find ()…

A: Given: Length, L = 2 m breadth, B=1.5 mm = 0.0015 m Height, H = 10 cm = 0.01 m Temperature of…