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

4.65 A system consisting of 5 kg of air is initially at 300 kPa and 20 degrees C. Determine the heat transfer necessary to (a) increase the volume by a factor of two at constant pressure, (b) increase the pressure by a factor of two at constant volume, (c) increase the pressure by a factor of two at constant temperature, and (d) increase the absolute temperature by a factor of 2 at constant pressure.

What does it mean if my Back Work Ratio is 1?

Calculate the variation with Tt4 of exit Mach number, exit velocity, specific thrust. Fuel/air ratio, and thrust specific fuel consumption of an ideal turbojet engine for compressor pressure ratios of 10 and 20 at a flight Mach number of 2 and T0= 217K.Perform calculations at Tt4 values of 2400K, 2200K, 2000K and 1800K. Use hPR= 42,800kJ/kg, cp= 1.004kJ/kg and γ= 1.4.

3. As a tool experiences crater wear, in general, the deepest point in the crater
formed on the tool rake face occurs at a distance away from the tool tip,
rather than at the tool tip. Elucidate the physics behind this observation.

15.Why is it not common to have milling cutters with negative axial rake angle
and positive radial rake angle?

14. (i) For a turning operation that entails ideal conditions, it is desirable to have
both the maximum roughness Rt and the machining time reduced by a factor
of 2, without altering the spindle speed. By what factor should the tool nose
radius be increased to achieve this? (ii) What limits the maximum tool nose
radius in practice?

A compressor, operating at steady-state, increases the pressure of an air stream from 1 bar to 10 bar while losing 4.2 kW of heat to the surroundings. At the compressor inlet, the air is at 25o C and has a velocity of 14 m/s. At the compressor outlet, the air is at 350o C and has a velocity of 2.4 m/s. If the compressor inlet has a cross-sectional area of 500 cm2 and the air behaves as an ideal gas, determine the power requirement of the compressor in kW.

A compressor, operating at steady-state, increases the pressure of an air stream from 1 bar to 10 bar while losing 4.2 kW of heat to the surroundings. At the compressor inlet, the air is at 25o C and has a velocity of 14 m/s. At the compressor outlet, the air is at 350o C and has a velocity of 2.4 m/s. If the compressor inlet has a cross-sectional area of 500 cm2 and the air behaves as an ideal gas, determine the power requirement of the compressor in kW.

6. The uncut chip thickness for an end-milling application that entails a cutter
with brazed inserts is 0.025 mm. For coating these tools would you employ a
Chemical Vapor Deposition (CVD) or a Physical Vapor Deposition (PVD)
process? Give three reasons to substantiate your answer.