Cold air at temperature of 10 C and velocity of 3 m/s is moving parallel to a flat plate with the length of 6 m and surface temperature of 75 C. A) Find the transition location on the plate and the heat loss from the plate. B) Repeat part (A) for water at the same velocity and temperature. The flat plate is made from copper.

1)The welding process with highest power density is: a) Electron beam welding. b) Plasma welding. c) Excimer laser welding. d) Shielded metal arc welding.

2) Welding 1015 and 1010 steels using CO2 laser: a) It is harder to weld the 1010 because of its low hardness. b) It is harder to weld the 1015 because of its low hardness. c) It is harder to weld the 1010 because of less prone for cracking. d) It is harder to weld the 1015 because of more prone for cracking.

3) Find the incorrect sentence from: a) Weldment melts and joins in fusion welding. b) Weldment melts and joins in solid state welding. c) Weldment melts and joins in brazing. d) Weldment melts and joins in friction welding.

4) When welding thin aluminum sheets with laser, the weldment should be: a) Positive b) Negative c) Either positive or negative d) None of the above

5) When using YAG laser to produce a lap joint of two steel sheets, the melt starts at: a) Top of the sheets. b) Between the sheets. c) Bottom of the sheets. d) None of the above.

6) In brazing, the base metals melt at temperatures above 840F (450C) while in soldering they melt at 840F (450C) or below a) true b) false

7) Which one of the following AW processes uses an electrode consisting of continuous consumable tubing containing flux and other ingredients in its core a) FCAW b) GMAW c) GTAW d) SMAW

8) Which one of the following arc welding processes uses a non-consumable electrode a) FCAW b) GMAW c) GTAW d) SMAW

9) "Stick" welding is a term sometimes applied when referring to a) FCAW b) GMAW c) GTAW d) SMAW

10) For metallurgical reasons, it is desirable to melt the weld metal with minimum energy input. Which one of the following heat sources is most consistent with this objective: a) high power b) high power density c) low power d) low power density

A gas mixture having a mass fraction of 20 percent nitrogen. 20 percent helium and 60 percent methane This mixture is expanded from 2800 kPa and 160°C to 150 kPa in adiabatic steady flow turbine of 80 percent isentropic efficiency Kinetic and potential energy effects are negligible. By

using ideal gas at room temperature, determine

(a) The average molar mass of the gas mixture

(b) The specific heats of the gas mixture

(The temperature at the exit of the turbine

(d) The power produce by the turbine

Determine the temperature, quality (X), specific volume, and internal energy of water at a state of P = 0.6 MPa and the enthalpy may be one of the followings; 1. h = 2930 kJ/kg. 2. h = 1700 kJ/kg 3. h = 600 kJ/kg Plot your results on T-v diagram for each case. Use thermodynamics' tables.

Suppose a ternary alloy containing 40 atomic % A, 20 atomic % B, 40 atomic % C solidifies through a ternary eutectic reaction to a mixture of α, β and γ with the following compositions: 80 atomic % A, 5 atomic % B, 15 atomic % C; 70 atomic % B, 10 atomic % A, 20 atomic % C; and 20 atomic % B, 10 atomic % A, 70 atomic % C. What will be the mole fractions of α, β and γ in the micro-structure?

Vortex Excitation, Lock-In, Initial Branch, Lower Branch, Upper Branch, Added Mass and Added Damping.

The piston cylinder contains 4 kg of saturated water vapor with 200 kPa. The heat is rejected from the water, and the piston moves from the stops when the pressure reaches 100 kPa. Then the heat is rejected until the total volume decrease to 30% from the initial volume. Determine the work done and heat transfer during this process, show the process on a P-V diagram.

1. A torsion spring has the following conditions:

• Moment load = 3.0 in-lb; Spring OD = 0.6”; 1/8” wire diameter; Squared and ground ends; 5 body turns; Material is music wire; Both end lengths = 0.75”

Answer the following:

Q1) In a food processing facility, a spherical container of inner radius r1 =41 cm, outer radius r2 = 43 cm, and thermal conductivity k = 2 W/m · °C is used to store hot water and to keep it at 105°C at all times. To accomplish this, the outer surface of the container is wrapped with a 510-W electric strip heater and then insulated. The temperature of the inner surface of the container is observed to be nearly 100°C at all times. Assuming 80 percent of the heat generated in the heater is transferred to container
a) Express the differential equation and the boundary conditions for steady one-dimensional heat conduction through the container,
b) Obtain a relation for the variation of temperature in the container material by solving the differential equation.
c) Determine the temperature at the center plane of the container

please read the article 'Exley Chemical Company' and write how could you manage the communications between the departments in the company to minimize conflicts. should be more than 300 words.

Calculate the torque requirements for SAE 5.8 Class Bolt having a size of M24 x 3 UNC

(a)250 kg of water at 1 bar and 35°C is turned into wet steam at 7 bar (x = 0.95). Given at 1 bar hf = 417 kJ/kg, hfg = 2258 kJ/kg, Tsat = 100°C and at 7 bar hf = 697 kJ/kg, hfg = 2067 kJ/kg, Tsat = 165°C. Determine the energy required.

(b)Determine the mass of dry saturated steam at 1 bar that must be added to 500 kg of water at 20°C to achieve a final water temperature of 45°C. Given; hf = 417 kJ/kg, hfg = 2258 kJ/kg. Tsat = 100°C.

Chapter 3 problem 15

Suppose that in a machining operation of multidirectional FRPs you are getting

high principal (cutting) forces. Which action would you take to reduce the

principal forces? Why?

(a) Reduce cutting speed

(b) Increase rake angle

(c) Reduce depth of cut

(d) Increase clearance angle

(e) All of the above