Explain and discuss what stall is and what causes an airfoil to stall. Why are commercial aircraft not allowed to fly at conditions near stall?

This is a heat transfer problem.

Question is the following;

You had been assigned, at General Motors, as design engineer to design a radiator ( Heat exchanger) for a new model car . It is necessary the the heat exchanger will be compact to fit within 2 feet by 3 feet space available in front of the car. IF the temperature of the incoming engine coolant is 150 degree Centigrade and outside temperature of air is about 38 C, what type of heat exchanger could reduce the temperature of the coolant to 40 C and find the surface area and number of the tubes necessary to do so. Select the Coolant properties as water. The coolant is circulated by water pump at rate of 0.5 kg/sec. Show all your work and justify the selection you made. Make all other engineering assumptions necessary for this design.

You might be surprised to know that each year vending machines kill more people in the USA (on average) than sharks do. Identify three different possible “accident” scenarios with vending machines and apply risk assessment criteria. Define the accident, state and defend your choice for severity and occurrence of each accident.

C4h10 fuel is burned in the cylinder with 150% corporate air powered by SI engine. The temperature and pressure at the start of combustion are 650 K and 1900 kPa, respectively. The exhaust temperature leaving the cylinder at the end of combustion is 1100K. So what is the Fuel / Air ratio (FA)? C = 12 H = 1 N = 14 O = 16

Explain and discuss what stall is and what causes an airfoil to stall. Why are commercial aircraft not allowed to fly at conditions near stall?

A 100 kW, 8-cylinder R-22 compressor with 20 kW power operates at zero & 40 C evaporating & condensing temps. The compressor bore 0.07 m & stroke 0.06 m with clearance volume of 5% runs at 30 rev/sec.
Determine:
a. Draw the PH diagram indicating all enthalpy & sp. vol.
b. Volumetric efficiency
c. Suction volume, m3/s
d. Piston displacement, m3/s
e. Actual volumetric efficiency
f. Actual work of compressor, kJ/kg
g. Isentropic work of compression, kJ/kg
h. Compression or adiabatic efficiency

A centrifugal pump has the following pressure - capacity characteristics:

It is planned to use this for a process having the following system characteristic:

(a) Determine the operating point for this pump with this system.

(b) The actual flowrate required by the process is 75 m³h ^–1 . If the overall efficiency of the pump at this flowrate is 70%, determine the power consumed when the liquid being pumped has a density of 1250 kgm^–3 .

(c) A second pump is available which has the following characteristics:

For the same flowrate (75 m³h ^–1 ), this pump has an overall efficiency of 75%.

(i) Determine the power used by this pump at a flowrate of 75 m³h ^–1 .

(ii) Would it be a better choice? Give reasons for your answer.

(iii) What other factors should be considered before a final choice is made?

Please can you write clearly as sometime i struggle to read what has been put and please can you be very detailed (put why you cancel something out, where a figure came from that wasnt provided etc) as i have seen a similar question answered with 5 different answers and none of them are the answers from an equation that they give.

Explain the working principle of the separator step by step (include sludge discharge process as well). Write down the differences between clarifier and purifier operation. Write down separator parts and their duties. Write the shock and start up procedures of separator. Explain why ALCAP separator is needed to be developed and describe its differences between conventional separator

(Please write keyboard and detailed)

The composite wall of a building consists of a 100 mm layer of common brick, a 100 mm layer of glass fibre (organic bonded), a 10 mm layer of gypsum plaster (perlite aggregate) and a 6 mm of pine panel. If the inside convection coefficient is 10 W/m2 .K and the outside convection coefficient is 70 W/m2 .K, calculate: (i) the total thermal resistance of the wall; (ii) the overall heat transfer coefficient of the wall.

R-134a expands through a throttling device from 900 kPA and 30 oC to -10 oC.
a- determine the entropy generation of this process.
b- the working fluid R-134a, this time expands adiabatically through a low pressure turbine with 90% isentropic efficiency from 900 kPa and 30 oC to -10 oC. What is the power generated by this turbine per unit mass flow rate of R134-a, in kj/kg.

A 1-m-diameter cylinder, 1 m long, is maintained at 800 K and has an emissivity of 0.65. Another cylinder, 2 m in diameter and 1 m long, encloses the first cylinder and is perfectly insulated. Both cylinders are placed in a large room maintained at 300 K. Calculate the heat lost by the inner cylinder.

What are the major source of emissions in power plant and how can we reduce it?

a) Discuss the heat generation mechanism in electric arc welding and oxy-acetylene gas welding.

b) Discuss the generation of neutral, reducing and oxidizing flame in gas welding along with the application of each type of flame.

c) Draw schematics of Metal Inert Gas (MIG) and Tungsten Inert Gas (TIG) welding process, and discuss the difference between them. Also, very briefly mention the different between these processes and submerged arc welding processes.

Sirius has a mass of 2 solar masses and radius of 1.71 solar radius, determine average
density of Sirius.

a) pressure at half radius of Sirius b) temperature at half radius of Sirius c) radiation pressure at half radius.

Hint: You may find the ideal gas law helpful. Mean molecular weight for outer layers of stars is ~ 0.61.

A 400-W cylindrical resistance heater is 1 m long and 0.5-cm-diameter. The resistance wire is placed horizontally in a fluid at 20◦C, flowing at a velocity of 20 m/s. Determine the outer surface temperature of the resistance wire in steady operation if the fluid is

(a) air and

(b) water. Ignore any heat transfer by radiation and evaluate properties of air at 800 K and properties of water at 315 K.