Explain how the compressibility and shock wave generation affects the design of fighter jets.

Metallurgy question:What is the most important properties of these materials ( Lead, tin, Silicon, Arsenic)?

For a BCC iron-carbon alloy that contains 0.23 wt% C, calculate the fraction of unit cells that contain carbon atoms.

One carbon atom per   ? unit cells.

(1) Describe briefly the definition of fully developed laminar flow.

(2) From governing laws for fully developed laminar flow, derive an equation for fully developed laminar flow that shows the relation between flowrate and pressure gradient.

Steam at 5mpa and 300C enters a turbine in a steady flow manner, from the turbine the steam expands to 200 kpa with a quality of 90%. FInd the ff:

a. The work done by the steam to the turbine in kj/kg

b. The amount of steam flow rate needed in kg/hr if the turbine produces 200kW of power

c. The efficiency of the expansion process

A rigid tank with a volume of 20 litres initially contains water at 0.1 degree of dryness and a pressure of 175 KPA. A steam disposal Valve is located at the top of the tank. Adding heat and steam by throwing the final case degree of dryness 0.4 and pressure 150 kPa is desired to be made. How much mass is ejected and what is the entropy produced. Heat source temperature 1000 K.

A mass of 0.3 kg of saturated refrigerant-134a is contained in a piston-cylinder device at 240 kPa.
Initially, 70 percent of the mass is in the liquid phase. Now heat is transferred to the refrigerant at
constant pressure until the cylinder contains vapor only.
(a) show the process on a P-v and T-v diagrams with respect to saturation lines. Determine;
(b) the volume occupied by the refrigerant initially,
(c) the work done, and
(d) the total heat transfer.

Describe the conduct of a typical creep test

which materials are best for heat exchangers.
I want to know everything that heat exchanger depends on like reynolds no., thermal conductivity, friction factor, etc.,
please explain everything of dependency of heat exchanger.

5. Identify any THREE hazards associated with the welding process.
6. What is difference between consumable and non-consumable electrodes? Identify one welding process that employs a consumable electrode and one that employs a non-consumable electrode?
7. Identify any THREE functions of electrode coatings used in SMAW process?
8. What information the electrode designation such as AWS E6018 provides?
9. What are advantages of GMAW compared to the SMAW process?
10. Identify any three metal transfer modes in relation to the GMAW process?.
11. Why shielding gases are used in the welding process?
12. List equipment and consumables used for the GMAW process, GTAW and SMAW processes.
13. Which of the arc processes cannot be employed for overhead welding position?
14. How the GTAW process is different from the GMAW process, and how it is similar to the GMAW process?
15. While using DC; which polarities can be employed for the GTAW process?
16. Which polarity results in high deposition rate? DEN or DCEP
17. Which polarity is better for deeper welds: DCEN or DCEP?
18. Compare heat affected zone for the laser beam welding process and the oxyfuel welding process, and comment on the difference.
19. Explain the mechanism of resistance spot welding, and steps involved in the process.
20. Which welding process would you recommend to fabricate the food cans: resistance seam welding or laser beam welding, and why?

Derive the constitutive model for a viscoelastic model that consists of a Voigt element (E1 for spring, and η for dashpot) in series with a spring (E2).

Now rearrange your expression so that all of the strain terms are on the right, and all of the stress terms are on the left. The strain portion of your constitutive model should read E1ηϵ+ϵ˙. What are the stress terms? In your symbolic expression, type E1 as "E_1", E2 as "E_2", σ as "sigma",and σ˙ as "sigmadot".

E1ηϵ+ϵ˙=

A weighted piston-cylinder device (pressure is not constant) initially contains 1.2 kg saturated liquid water at 190oC. Now heat is transferred to the water until the volume quadruples (increase four times) and the cylinder contains saturated vapor only. Determine: a) The final volume of the tank. b) The final temperature and pressure. c) The internal energy change of the water.