1. An aluminum air-cooled engine cylinder head for a single cylinder, 2-stroke engine is to

be die-cast. The overall diameter of the cylinder head is 101.6 mm. If the projected

plan area of the runners and gating system is 100 mm2 and the casting pressure is 10

MPa (1500 psi), what minimum locking force is required for the die-casting machine in kN.

A high-school classroom is occupied by 20 students who each produce 180 Btu/h (53 W) of sensible heat and 0.20 lb/h (0.09 kg/h) of moisture. The class is to be maintained at 68°F (20°C) and 55% relative humidity. Conditioned air is supplied at 60°F (15°C) to meet the sensible and latent loads. What is the SHR? To meet the loads, what must the humidity ratio and mass flow rate of the supply air be? The office is located at 5000 ft (1500 m) altitude.

A high-school classroom is occupied by 20 students who each produce 180 Btu/h (53 W) of sensible heat and 0.20 lb/h (0.09 kg/h) of moisture. The class is to be maintained at 68°F (20°C) and 55% relative humidity. Conditioned air is supplied at 60°F (15°C) to meet the sensible and latent loads. What is the SHR? To meet the loads, what must the humidity ratio and mass flow rate of the supply air be? The office is located at 5000 ft (1500 m) altitude.

A pot with boiling water at 100 C, if the handle is 3 mm thick, 22 mm wide, 300 mm long and exposed tp 19 C temp, h= 5 w/m2 c.

What is the temp at the end of the handle if it is k= 13, and then if it was k = 180 W/m.k

What kind of assumptions

Does insulation need to be on the intire handle from being burned why?

6.It is proposed to study the entry of an aircraft launched torpedo into seawater. The full-size prototype torpedo is 2.44 m in length and enters at 100 m/s into seawater which has a kinematic viscosity, ν = 1.17 x 10-6 m2/s (see the table in the front cover of your textbook). A model test is proposed where the length of the model torpedo is 0.537 m in length. The desire is to predict the force on the prototype torpedo upon entry into the water, using the measured force in the model study.

a.Assuming F = f(ρ, μ, V, L, g) determine the relevant dimensionless parameters for this flow phenomenon. Use ρ, V and L as the repeating variables in your analysis. V is the entry velocity, L is the length of the torpedo and g is the acceleration of gravity.

b.Assuming the dimensionless parameter containing the viscosity is not important at these conditions determine the necessary launch velocity in the model study and the force on the prototype if the measured model force is 9 N. (Assume g is the same for both the model and prototype. Also assume seawater is used in the model study.)

c.Now, assume the dimensionless parameter containing the viscosity is important. Can the fluid used in the model study be the same as the prototype fluid (seawater)? Explain. If not, can you find a fluid for the model study such that full similitude is achieved between the model and prototype? What fluid?

Using the method of characteristics, compute and graph to scale, the contour (using solid lines)
and the characteristics (using dashed lines) of a two-dimensional minimum-length nozzle for the
expansion of air to a design exit Mach number of 3. Assume the specific heat ratio is 1.4. For
clarity, lay out the design using a schematic, number the intersection points for the characteristics,
develop the calculations using a spread sheet and show the spread sheet results for each point for
K-, K+, θ, υ, μ, Mach number, x and y for every point. Use at least 8 characteristics for the initial
expansion. Please turn in the following:
a. Your diagram
b. Your spreadsheet
c. Your spreadsheet results in tabular form
d. Your final scaled drawing of the nozzle characteristics and nozzle wall boundary.

THRUST GENERATION

You are to make a bowling ball out of 2024-0 by forging in an impression die with flash. What force (tons) is needed? What will be the weight of the finished bowling ball?

Yield strength = 75 MPa = 11 ksi

Ultimate tensile strength = 190 MPa = 27 ksi

Max bowling ball diameter = 8.595 inches

Density = 0.1 lbs/in³

Explain how propeller synchronization system works and also how the Synchrophasing system works. What are the benefits?

Assignment:         Analyse and evaluate a faulty Mass Air Flow sensor.

1.         You will choose a vehicle with a MAF sensor that was produced after 1998.

2.         You must say what the fault is that has occurred (eg. MAF sensor voltage too high), and the DTC that would be logged.

3.         You must say what the symptom of this fault would be (what would the customer notice?).

4.         Show, using a diagram, how you would check the sensor. You must show what test equipment you would use AND how you would connect it to the sensor.

5. What are the correct readings you should see using the test equipment you have chosen?

6.         You must say what the Engine Management System would do if this fault occurred (ie. what is the failsafe?).

7.         You must say how this fault may have occurred and what can be done to make sure it doesn’t happen again.

Please do all the problems, above it is laboratory work. Please do ASAP. Please. I will give a high rating for this complete Solution. Thank You

A single-screw polymer extruder can be thought of as a pump and a heating device for plastic pellets. A certain extrusion setup has the following characteristics:

• Polymer: Polyethylene with density 0.95 g/cm3, specific heat 1800 J/kgK

• Flow characteristics: polymer temperature increases from 25 C to 200 C, flow rate 10 kg/hr, extruded strand is a cylinder, 2 mm in diameter

• Heating elements: multiple electric heater bands available with 110 Volt, 2 Amp rating

• You measure a back pressure of 300 MPa and a torque of 100 N m at 100 rpm.

Using the energy and mass balances, answer the following about this extruder:

a. What is the linear velocity of the strand exiting the die?

b. What is the rate of shaft work required to run the screw?

c. How many heater bands are required to heat the polymer to the required melt temperature?

When do we apply Kutta condition? (hint: inviscid/viscous?)

An experimental arrangement for measuring the thermal conductivity of solid materials involves the use of two long rods that are equivalent in every respect, except that one is fabricated from a standard material of known thermal conductivity k_A while the other is fabricated from the material whose thermal conductivity k_B is desired. Both rods are attached at one end to a heat source of fixed temperature T_b, are exposed to a fluid of temperature T_∞, and are instrumented with thermocouples to measure the temperature at a fixed distance x₁ from the heat source. If the standard material is aluminum, with k_A = 210 W/mK, and measurements reveal values of T_A = 75^oC and T_B = 55 ^oC at x₁ for values of T_b = 100^oC and T_∞ = 25^oC, what is the thermal conductivity k_B of the test material?

k_B =   W/mK

Liquid water at 15 ℃ is heated by mixing it with saturated steam at the same pressure. Liquid water enters a chamber at a rate of 4.3 kg/s and saturated steam enters at a rate of 0.17 kg/s. The mixture leaves the mixing chamber as a saturated liquid at 40℃. If the surroundings are at 15℃, determine (a) the temperature of the saturated steam entering the chamber, (b) the exergy destruction during this mixing process, and (c) the second-law efficiency of the mixing chamber. Hint: You must look up the second-law efficiency of a mixing chamber.

Calculate the theoretical A/F ratio for the complete combustion of propane (C3H8) on mole basis and mass basis. Also, calculate the equivalence ratio for the following reaction:

C3H8 + 7O2 + 26.32N2 → 3CO2 + 4H2O + 2O2 + 26.32N2