When length the of crank and connecting rod is changed (i.e crank of length is changed by keeping connecting rod length constant and in other case connecting rod length is changed by keeping the crank length constant) what implications does it have on the reciprocating engine?

Fluid Mechanics

why peak sun hours is used in estimation the size of many solar thermal and power systems ?explain

When you use a numerical method like the finite element method, you divide a large body into an equivalent system of smaller bodies called elements. This is done because using an analytical method on the larger body may require a solution to a boundary value partial differential equation; a task that might be difficult or impossible to solve. The question: why does dividing a large object into smaller objects help at all? If you divide a rectangle into tiny rectangles and ask each of those tiny rectangles the same question that you were asking the large rectangle (which would require the solution to a boundary value differential equation), what good have you done? Please explain.

A vessel initially containing 1 kmol of CO and 4.76 kmol of dry air forms an equilibrium mixture of CO₂, CO, O₂, and N₂ at 2800 K, 1 atm. Determine the equilibrium composition.

Thermodynamics - water

P = 20 bar, T = 250 C, what is the specific volume? (choose the closest answer)

a)0.1085

b)0.15

c)0.1200

d)0.1308

T = 240 C, P = 2.5 bar, what is the specific internal energy?.

a)2713.1

b)2714

c)2717.2

d)2720

P = 20 bar, h = 2900 kJ/kg, what is the temperature?

a)250

b)240

c)280

d)300

Transient heat transfer

Leaking steam completely fills a room, pushing out all of the air. The steam is at atmospheric pressure. Because the mortar cement siding walls are initially cool, at a uniform temperature of 22C, the steam begins to condense on the walls. Find the rate of condensation per square meter of wall at (a) 10 s and (b) 30 s after the leak.

The wall is 10 cm thick, and you may assume that the other side of the wall, the side not in contact with the steam, is insulated. You may make the following simplifying assumptions:

• The convective heat transfer rate due to steam condensation is infinitely high and remains constant

• The effects of radiation are negligible.

Solve the following using expressions m & n. NOT actual numbers

A HydroCarbon Fuel C_mH_n is burned at atmospheric pressure with stoichiometric amount of air as the oxidizer. Determine the EXPRESSION of air fuel ratio, the mole fraction and the combustion products.

Manufacturing Technology

1. Glass
(a) melting point
(b) process in producing glass

Air flows over a 4 meter long flat plate at a velocity of 8 m/s. Using a spreadsheet, calculate the boundary layer thickness and wall shear stress at 0.1 meter intervals along the plate. Do not plot the wall shear stress at x=0. Use a transition Reynolds number of 5 x 10^5 . (You will need to calculate Rex at each location to determine if the laminar or turbulent correlations should be used.) Generate a spreadsheet table that includes columns for the x location, Reynolds number, boundary layer thickness, and wall shear stress. Also include the exact transition location in the x column. At the transition location, calculate both the laminar and turbulent correlations and include both values in your plot. (The solution will have a jump at the transition point.) Plot your results for the boundary layer thickness and wall shear stress on separate plots. Submit a copy of your EXCEL table and the plots you generated. Include a plot title and label the axes with the variable name and units. Use only lines, no symbols, to show your analytical solution.

Im designing a boat anchor winch that anchors a load of 1000 kg into the water when the boat is stationary with a wire line from the winch to the anchor, I came up with a spur gear design a pinion gear 1 and gear 2. Gears is made of carbon steel. For that application what is the correct motor to connect into the spur gear. How much horseower does gear 1 and gear 2 need to operate a 1000 kg load. You can estamate the rest of the variables.

The flight test data for a given airplane refer to a level‐flight maximum‐velocity run made at an altitude that simultaneously corresponded to a pressure altitude of 30,000ft and density altitude of 28,500ft. Calculate the temperature (in °F) of the air at the altitude at which the airplane was flying for the test.