why would one choose a fire tube boiler instead of a water tube boiler

(30%) Q5. Composition of gas in diesel engine after combustion engine is 5% oxygen, 20% carbon dioxide, 15% water vapor, and remaining is nitrogen gas in volume. Temperature and pressure of the gas is 1800K and 6 MPa. This gas is isentropically expanded to the atmospheric pressure. Use air standard assumption.
a) Calculate the required properties of gas mixture (specific heats, gas constant, etc.)
b) Calculate the power generated expansion for per kg of mixture.
c) What is the temperature of gas after the expansion process.

Consider a large plate of thickness 50 mm and thermal conductivity of k= 69 W/m.C in which heat is generated uniformly at a constant rate of 600 kW/m³. One side of the plate is insulated while the other side is subjected to convection to the environment at 30^oC with a heat transfer coefficient of h= 94 W/m^2.C. considering six equal spaced nodes with a nodal spacing of 10 mm:

(a) obtain the Finite Difference formulation of this problem,

(b) determine the nodal temperature under steady conditions by solving those equations (MANUALLY),

(c) repeat (b) by solving the equations using any software available,

(d) obtain the analytical solution of the temperature variation by applying Boundary Conditions, (e) sketch ONE graph showing the temperature value of those nodes that obtained from part b and d

information about (shaft's critical speed)..
What is it? How it happens? How to avoid it?
Draw??

i want for an exercise to find the materials for a supsension car system and manufacturing

Air flows down a pipe with a diameter of 0.15 m. At the inlet to the pipe, the Mach number is 0.1, the pressure is 70 kPa, and the temperature is 35°C. If the flow can be assumed to be adiabatic and if the mean friction factor is 0.005, determine the length of the pipe if the Mach number at the exit is 0.6. Also, find the pressure and temperature at the exit to the pipe.

Why can't I use the sum of force(about y axis) =0 at point P? I used this method to get the tension in the cord at first of solution, but gotten wrong answer.

http://www.chegg.com/homework-help/mechanics-of-materials-8th-edition-chapter-1-problem-6p-solution-9780136022305?trackid=1b3aa2d6&strackid=4d3f9551&ii=1

Research and write a recommendation report that compares two or more things. Address a topic or issue of your major field of study.

simplify washing machine by removing its design elements/parts one by one. How many parts did you remove until it does not work well? What are these parts? What can you say about the simplicity of the product?

What is brake mean effective pressure (bmep)? Is it a work term or is it a pressure term? Write the formula/equation for bmep. Make a table of typical maximum values (range of values) of bmep for various engines.
Note: In engine design calculations, the displacement required to provide a given torque or power at a given speed can be estimated by assuming appropriate values of bmep for that particular application. Engineers typically remember these values.

1.a Which meshing considerations are important to consider when performing a modal analysis?

1.b sing the Ansys command remote force is sometimes handy to apply a force to a model. In which case could precaution be appropriate and why

1.a Show that you understand what element distortion is by explaining the general problem caused by too distorted elements and drawing ideally and distorted elements of the following types: a) Solid tetrahedron b) Solid hexahedron c) Triangular 2D-element d) Quadrilateral 2D-element

1.b What are the thermal analysis equivalent parameters, and their corresponding units, of the following structural parameters ?

a) D isplacement

b) Strain

c) Stress

d) Load

e) Essential boundary conditions

f) Elastic supports   

1. Use Thwaites' method to find the separation point for flow across a infinitely long cylinder (BOUNDARY LAYER THEORY IN FLUID MECHANICS).

Consider a simple ideal Rankine cycle which uses water as the working fluid. The boiler pressure is 6100 kPa and the condenser pressure is 30 kPa. At the turbine inlet, steam is at 480°C. The isentropic efficiency of the turbine is 92 percent. The pump losses are negligible and the water leaving the condenser is subcooled by 6.3°C. The boiler is sized for a mass flow rate of 20 kg/s. Determine the following values.

The temperature at the pump inlet.

°CThe specific volume at the pump inlet.

m³/kgThe specific enthalpy at the turbine exit.

kJ/kgThe rate at which heat is added in the boiler.

kWThe power required to operate the pumps.

kWThe net power produced by the cycle.

kW

The thermal efficiency.