Describe the design experiments method for product and process optimization
In: Mechanical Engineering
What are the general principles of DFA? What are the steps to minimize the number of parts for an assembly?
In: Mechanical Engineering
where do atheism and christianity agree and disagree on views of the origin of the universe?
In: Mechanical Engineering
Describe 2 alternative processing approach of tool steels that enables fine and homogenous primary carbide distributions.
In: Mechanical Engineering
1. Identify and describe the four domains of Axiomatic Design
2. Why would we use Axiomatic Design or Quality Function Deployment in the design of a process and simulation model?
3. Why do we flowchart processes prior to simulation?
In: Mechanical Engineering
Explain the meaning of the following terms with respect to professional engineering practice :
a) Lump sum contract
b) Confidential disclosure
c) ACCC
d) Continuing professional development
e) Incident reports
f) Risk assessment
g) Breach of contract
h) Common law
i) Preliminary negotiations
j) Patent
In: Mechanical Engineering
Air is supplied to a convergent–divergent nozzle from a
reservoir where the pressure is 100 kPa. The air is then
discharged
through a short pipe into another reservoir where the
pressure
can be varied. The cross-sectional area of the pipe is twice
the
area of the throat of the nozzle. Friction and heat transfer may
be
neglected throughout the flow. If the discharge pipe has
constant
cross-sectional area, determine the range of static pressure in
the
pipe for which a normal shock will stand in the divergent
section
of the nozzle. If the discharge pipe tapers so that its
cross-sectional
area is reduced by 25%, show that a normal shock cannot be
drawn
to the end of the divergent section of the nozzle. Find the
maximum
strength of shock (as expressed by the upstream Mach number)
that
can be formed.
In: Mechanical Engineering
With a flowchart showing the overall activities in the production of a part or component, show the stage where the material of the part or component is determined.
In: Mechanical Engineering
state the three fan laws for variation in speed as well as three laws for variation in density
In: Mechanical Engineering
In: Mechanical Engineering
A rigid, sealed container of R134a initially at -30°C and 40% quality is placed inside a room so that it heats up at 5°C/hr. If there is 3 kg of R134a in the container, determine:
a) The volume of the container
answer must be 0.2723 m3
b) The specific volume of the vapour when the R134a finishes converting into a gas
answer must be 0.09075 m3/kg
c) The pressure when all the R134a has finished converting into a gas
answer must be 222.8 kPa
d) The energy required to turn all the R134a into a gas
answer must be 399.6 kJ
e) How long it will take for all the R134a to become a gas
answer must be 4.52 hrs
In: Mechanical Engineering
A Diesel engine with a compression ratio of 16 has a cutoff ratio of 1.5. The state before polytropic compression (exponent 1.3) is 1700 cm3 , 96 kPa and 22°C and there is isentropic expansion.
(a) Sketch the P-v diagram for this cycle.
(b) Calculate the heat transfer in and heat transfer out.
answer must be Qin = 657 J or 724 J or 866 J, Qout = 291 J or 296 J or
(c) Determine the thermal efficiency.
answer must be 56% or 59.1% or 64.1%
(d) Calculate the mean effective pressure
answer must be 230 kPa or 268 kPa
In: Mechanical Engineering
A turbine flowmeter has a bore of internal diameter 150 mm. The
rotor consists of eight
blades, each of mean thickness 5 mm, mounted on a hub of mean
diameter 35 mm. The clearance
between each blade tip and the bore is 1 mm, and the inlet blade
angle at tip is 20°. Estimate
the meter factor K in pulses/m3.
In: Mechanical Engineering
If a dynamic pressure of 250 Pa was measured in a water tunnel using a pitot static tube and a mercury (denisty of 13650 kg.m ^ -3) manometer inckunded at 30 degrees, what is the velocity being measured in the water tunnel?
In: Mechanical Engineering
1- You need to analyze the operation and performance of a four-stroke, spark-ignition internal combustion engine (automobile engine).
a- Would you analyze the engine as an Open System or a Closed System?
b- How many properties of the engine exhaust would you need to measure in order to determine the Thermodynamic State of the exhaust gas?
c- Identify a set of properties of the exhaust gas that you might measure to establish its state.
d- Are these properties Intensive or Extensive?
In: Mechanical Engineering