This is problem 5-17 from El-Wakil’s Powerplant Technology book -- consider a simple combination turbine with one Delaval impulse stage and one 60 percent reaction stage. The nozzle of impulse stage receives steam at 900 psia and 900°F and leaves it at 300 psia. The nozzle efficiency is 97 percent and its angle is 20°. The blade speed is optimum and its velocity coefficient is 0.95. The impulse stage is followed on the same shaft by the reaction stage which exhausts to 100 psia. The steam entrance angles for that stage are also 20°. The efficiency of the fixed blades (nozzles) is 90 percent. Because of different diameters of the impulse and reaction moving blades, the velocity of the reaction blade is 1.5 that of the impulse blade. (a) Determine all steam velocities and draw the velocity diagram of the combined turbine, (b) calculate the work of each stage, in Btus per pound mass, and (c) calculate the individual stage and the turbine efficiencies.

Prove that any planar F-dof (degree of freedom) linkage (contains lower pairs only) must have at least F+3 binary links.

This is problem 5-13 from El-Wakil’s Powerplant Technology book -- a 50 percent reaction stage in a steam turbine undergoes a total of 20 Btu/lb_m enthalpy drop. The nozzle efficiency and angle are 88 percent and 25°, respectively. The blades move at 420 ft/s and have V_r1 = 332 ft/s, V_s2 = 386 ft/s, and ? = 22°. The steam flow is 1.08x10⁶ lb_m/h. Find (a) the work done by the stage in horsepower and megawatts, (b) the blade efficiency, (c) the stage (nozzle and blade) efficiency, and (d) the blade velocity corresponding to maximum efficiency, in feet per second.

5. A power cycle receives energy QH by heat transfer from a high temperature energy source at TH = 2000 K and rejects energy QL by heat transfer to a low temperature energy sink at TL = 400 K. For each of the following cases determine whether the cycle operate reversibly, irreversibly, or is impossible.

(a) QH = 1200 kJ, Wcycle = 1020 kJ.

(b) QH = 1200 kJ, QL = 240 kJ.

(c) Wcycle = 1400 kJ, QL = 600 kJ.

(d) efficiency = 40%.

Air at 1 atm and 27 degree C flows across a flat plate at a velocity of 14 m/s. Find the distance from the leading edge where transition to turbulent flow begins and the local heat-transfer coefficient at this point if the temperature of the plate is 77 degree C.

A piston?cylinder device initially contains 1.5?kg saturated liquid water at 120°C. Now heat is transferred to the water until the volume increases 100 times.

Determine:

a. Initial Volume of the water.

b. Final volume of water.

c. Final state of water.

d. Amount of heat added to the water

e. Draw the T?s diagram

What are the largest and smallest turbulent length scales in an unstratified open drain of depth 1 m that is flowing at velocity U=10 cm s^-1 ? Assume q=0.1U. Is the flow turbulent?

Discussion: Design Feasibility Studies and Alternatives in testbed

-Load can break bearing: dynamic and static load

- bearing life expectancy of bearing

- how the measurment of part and equiqment help you to determine force and whight ?

Aircraft Structural Engineering "consider you are designing the aircraft, how you will specify the bulkhead distances in aircraft fuselage?" i want the procedure of the calculations for this. OR give me some proper stuff to study about it, any book (with page numbers), or any link.

Plot schematic stress strain diagram for composite material. Show each stage in the graph and explain them.

Illustrate how ferromagnetic and paramagnetic material behaves under external field and after removal of external field.

Derive Green’s Theorem from Sturm-Liouville Eigen Value problem. When do you need Green’s theorem in the context of a Heat or Diffusion Equation?

Assume you are making a compisite material airplane, which has ligter weight and more fuel effciency. Describe how your airplane will put pressure on a culture outside of America (Choose a specific country). How your airplane will affect their society, culture, economic, and envornment, etc?  

Assume you are making an airplane to meet an application. For example, air dropping of supplies and carrying of small packages. Describe how your airplane will put pressure on a culture outside of America (Choose a specific country). How your airplane will affect their society, culture, economic, and envornment, etc?  

Assume you are making an airplane to meet an application. For example, air dropping of supplies and carrying of small packages. Describe how your airplane will put pressure on a culture outside of America (Choose a specific country). How your airplane will affect their society, culture, economic, and envornment, etc?