A thermocouple (TC) reads a temperature of 180 degrees C when placed in a large wind tunnel. The thermocouple is exposed to convection and radiation heat transfer.

• The convection heat transfer coefficient h = 125 W/m²-K.
• As for radiation, the surface of the thermocouple is diffuse and gray with an emissivity of 0.6. The walls of the wind tunnel are at a uniform temperature of 450 degrees C.

Questions:

1. Provide a sketch
2. State your assumptions
3. Calculate the temperature of the air in the wind tunnel
4. The walls of the duct have an emissivity of 0.85. Explain in one or two sentences why the emissivity of the walls should (or should not) have an effect on your answer?

In Multi-Effects Desalination (MED) system composed of 4 effects, and 3 feed
preheaters and down condenser. List the following:
a- The mass balance in the evaporator, feed preheater and down condenser
b- The energy balance in the evaporator, feed preheater and down condenser
c- The Material balance in the first effect
d- The temperature profile of the feed if the intake temperature is 25ºC and
temperature of last effect is 40ºC and the temperature of first effect is 60ºC
e- What will happen to the transfer area of the evaporator if the motive steam
temperature is increased to 100ºC where the rest is remaining constants.

Which of the following polymers may be produced by condensation polymerization? Choose which apply.

1) Phenol-formaldehyde

2) Poly (vinyl chloride)

3) Polycarbonate

4) Nylon

5) Polystyrene

6) Polyethylene

(a) Apply Maxwell relation and Gibb’s first equation (du=TdS-Pdv) to find the (∂u/∂P)_Trelation in terms of directly measurable properties (P, V and T). For an ideal gas, what will be the value of that partial derivative?

(b) Illustrate physical meaning of Inversion line with the help of T-P diagram.

(C) Assume that carbon dioxide (CO2) is collected from bacterial decomposition of organic matter at 5℃, and atmospheric pressure (100 kPa), and is required to be used in a process at -30℃, 40 bar. Apply theory of real gas behavior to calculate how much actual minimum work input and heat transfer is required to reach this state. Also, suggest some devices that can be used to obtain this state change

31. Write a report on advancement in wheel and tyre technology.Also the report should be consest of 10-12 Page,Advantage disadvantage,Future scope.Plagarsim level should be Zero.

Please don't answer if you don't know and write the report on 10-12 page minimum.
For small answer or for plagrism I will downrate your answer.So if you know than only answer it

Consider that a 1.35 wt% C- 98.65 wt% Fe alloy. Determine the weight fraction of the following.

(a) Proeutectoid Ferrite:
(b) Proeutectoid Cementite:

(c) Pearlite:
(d) Ferrite in Pearlite:

An airplane with a total span length of b = 60 m and cord length of c = 6 m wants to land at the airport. Holiday Rentals wing profile is NACA 23012 and single slot flaps are open while landing (α = 12 °, CL, flapli = 3, CD∞ = 0.07). Airplane Find the weight (kN) of the aircraft if it lands at 1200 kW thrust (ρ air = 1.2 kg / m3 ).

what are the thermal properties of composite materials??? with references, please.

Develop a simple MIS (Management Information System) that consists of a simple database (a text file). The system manages to dynamically input record/data into the database. The data from the database can be sorted, searched and updated. User also should be able to add new records/data, remove any data and etc.
Here are some ideas of MIS that can be developed:
1. Hotel reservation system.
2. Students management system.
3. Payroll management system.
4. Bus/Railway/Plane ticketing system.
5. Clinic record management system.

A solid propellant rocket engine gases at 3000 K stagnation temperature and 6000 kPa stagnation pressure It manufactures. The exit and throat areas of the nozzle are 0,01 m2 respectively. and 0.005 m2 Adiabatic base of the produced gases 1,4 and the gas constant is 320 J / kg.K. Find the thrust produced by the rocket at a height of 25 000 m (kN).

Give a step by step process of veryfying that a component under a set of loads will not fail.
Soild Mechanics course question

Determine the mass flow rate of the refrigerant flowing through the condensor of a two-stage compression refrigeration cycle (in kg/s). The fraction of the refrigerant that evaporates as it is throttled to the flash chamber is 0.19. The enthalpy of the refrigerant entering the evaporator is 55.14 kJ/kg and the enthalpy of the refrigerant leaving the evaporator is 239.19 kJ/kg. The amount of heat removed from the refrigerated space is 28 kW. (Round your answer to three decimal places).

1. Residual stress refers to stresses induced by plastic strain. T or F
2. Failure criteria is identical for ductile and brittle materials. T or F
3. Statically indeterminate problems can be solved by using additional equations provided by Hooke's Law. T or F.
4. To analyze stress at any point of any component or structure , one should consider:
5. The stress developed in a cylindrical pressure vessel along the longitudinal axis is:

Q8. Using a machine element , describe fatigue in engineering materials . Why is fatigue loading more dangerous than normal loading. As a design engineer, how can you prevent failure by fatigue.

1. One important point for an automobile radiator design is to cool the engine while moving at 50 km/h on a 7% grade road in a desert summer condition. Your responsibility as a design engineer is to make sure that the coolant (water in this case, since it is the hot summer time, no antifreeze is needed) temperature at the radiator inlet does not exceed the saturation temperature of water at this point. Consider a radiator that can be approached as a cross – flow heat exchanger with both fluids unmixed and working under the following conditions:

The manometer reading at the radiator water inlet is 100 kPa (the gage pressure!) where the local atmospheric pressure is also 100 kPa.

The engine heat rejection rate: q = 40 kW.

For air; flow rate 2700 kg/h, inlet temperature 52 ℃, specific heat 1008 J/kg.K.

For water; flow rate 5130 kg/h, specific heat 4244 J/kg.K.

For the radiator UA = 1134 W/K.

1. Determine the water inlet and outlet temperatures and air outlet temperature from the radiator. (15 P)
2. Determine the logarithmic mean temperature difference correction factor F and estimate the value of corrected logarithmic mean temperature difference for the radiator. (10 P)
3. Neglecting the pressure losses within the radiator, determine whether the design is safe or not against overheating (against boiling within the radiator). (15 P)
4. One effective way of obtaining safe operating conditions against radiator overheating may be increasing fan power to obtain higher air flow rates. If your findings for Part c) indicate unsafe operating conditions, determine the minimum air flow rate that ensures safe operation against the radiator overheating. To do this, increase the air flow rate with 90 kg/h intervals, until yuo reach safe operating conditions, while keeping the other parameters fixed at the above given values. (15 P)

1. A low quality coal known as Saray lignite has the components of C = 45%, H = 4%, O = 17%, S = 4%, N = 2%, A = 13% and W = 15%. Carry out the following analyses for this lignite:

1. Using the exact formula determine the heating value. (5 P)
2. Draw the Ostwald dagram in a scaled manner. (10 P)
3. After the combustion, 6% CO₂ and 10% CO contents are measured in the stack gases. Obtain the excess air coefficient and the ratio of O₂ within the stack gases, utilizing the Ostwald diagram you drew in Part b). (10 P)
4. Determine the excess air coefficient and the ratio of O₂ within the stack gases, using the analytical relations and compare the results with the ones you obtained in Part c). (10 P)
5. In what type of boiler and under which conditions do you think this lignite should be used in the lights of above estimated values of fuel components, the excess air coefficient, and the heating value. (10 P)