The electrical conductivity and the electron mobility for copper at room temperature are 6.0 X 107 (W.m)-1 and 0.003 m2/V-s, respectively. Compute the number of free electrons per copper atom.
In: Mechanical Engineering
QUESTION 1
Tick the option which correctly describes the units of
parameters defined in an operation sheet?
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a. |
Cutting Speed (ft/min), Spindle Speed (rev/min), Feed (in/rev), Depth of Cut(in) |
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b. |
Cutting Speed (in/min), Spindle Speed (rev/sec), Feed (mm/rev), Depth of Cut(in) |
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c. |
Cutting Speed (ft/min), Spindle Speed (rev/min), Feed (in/rev), Depth of Cut(mm) |
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d. |
Cutting Speed (ft/sec), Spindle Speed (rev/min), Feed (mm/rev), Depth of Cut(mm) |
10 points
QUESTION 2
What steps are necessary for Process Planning of a job shop?
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a. |
Size of Components, Shape of components, Tolerances |
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b. |
Material |
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c. |
No. of pieces to be produced, Available machine tools, Material properties |
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d. |
All of the above |
10 points
QUESTION 3
Which one of the characteristics does not define the work of a route sheet?
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a. |
Lists all manufacturing operations & associated machine tools |
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b. |
Describes every machining & assembly operation |
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c. |
Specifies process sequence of a job |
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d. |
Defines path of material |
10 points
QUESTION 4
Which of the statements holds true for a job shop?
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a. |
Variety of products can be manufactured |
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b. |
Workers need not require to not have high skill levels |
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c. |
Large manufacturing lot sizes are avoided |
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d. |
All of the above |
10 points
QUESTION 5
Which is one of the difficulty that Digital Simulation faces in absence of manufacturing system design?
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a. |
Data is easy to secure, accurate & non-conflicting |
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b. |
All system analyses are subject to errors of omission & commission |
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c. |
Environment cannot change the system and vice versa |
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d. |
Manufacturing system are simple, easy to define and has clear goals |
10 points
QUESTION 6
Which of these is a disadvantage of application of PLC in a flow shop?
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a. |
Reprogrammable |
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b. |
Machines are flexible |
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c. |
Increased Construction time |
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d. |
Relay panels are no more vulnerable to electronic noise |
10 points
QUESTION 7
In a manufacturing system, the critical control functions are
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a. |
Inventory control, Production rate & mix control |
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b. |
Quality control & Machine tool control |
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c. |
Inventory Control, Machine tool control & Quality Control |
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d. |
Both a & b |
In: Mechanical Engineering
If a strain gage is placed in the wing of an aircraft where the temperature drops by 50 degrees F in flight. How do you configure the bridge to compensate for the resulting error?
In: Mechanical Engineering
Water vapor at 5 bar, 320°C enters a turbine operating at steady
state with a volumetric flow rate of 3 m3/s and expands
adiabatically to an exit state of 1 bar, 160°C. Kinetic and
potential energy effects are negligible.
Determine for the turbine:
(a) the power developed, in kW.
(b) the rate of entropy production, in kW/K.
(c) the percent isentropic turbine efficiency.
In: Mechanical Engineering
Regarding Fused Deposition Modeling (FDM) process, answer the following questions with a detailed explanation:
1. How and why temperature, pressure/force, and time impact the following quality issues:
- Surface finish
- Dimensional accuracy
2. ?Identify and explain the reason behind the key processing limits relevant to the FDM process that are based on:
- Limits of the material being processed
- Limits of the equipment being processed
In: Mechanical Engineering
a.) What is the thermal efficiency of a steam power plant
operating on the Rankine cycle if saturated steam is supplied to
the turbine at 1000 psia, and the condenser is at 1 psia. Use a
turbine efficiency of 95% and a pump efficiency of 85%. Refer to
Chapter 9, Sections 10-11, as necessary.
b.) Determine the thermal efficiency if the steam is superheated to
1000 F, assuming all else equal.
In: Mechanical Engineering
Derive the electromagnetic wave equation in terms of the magnetic field H
In: Mechanical Engineering
Briefly describe what a duct blowers function is as it applies to residential energy audits
In: Mechanical Engineering
You and your teammates will construct a Concept Map that clearly illustrates how to use the "steam tables" (A-4 through A-7 in SI units) to find the thermodynamic properties and/or determine the phase of water. Your maps should include the following concepts (at a minimum): ? All 5 phases discussed in class on Monday, 4/16. Include information for how to deal with a compressed liquid at a pressure of less than 5 MPa. ? The Dome (include at least one of the diagram) ? Saturation Pressure ? Saturation Temperature ? Quality ? If we wanted to use USCS, how would that change the situation? ? If R134a was the working fluid, how would that change the situation?
In: Mechanical Engineering
At what distance ‘X’ will the carbon concentration in a steel specimen be 0.70 wt. % after 10h at 1100 0C, if the starting composition was 0.35 wt. % C and the surface concentration is 1.35 wt.% C?
how do you get x/2sqrt(DT)=0.66085?
In: Mechanical Engineering
Carbon Dioxide is being generated in an occupied space. Each person breathe out carbon
dioxide at the rate 0.0107 cfm. Outdoor air with CO2 concentration of 280 ppm is being
supplied to the space at the rate of 6000cfm. It is desired to keep the concentration level of
CO2 in the space below 1000 ppm. Assuming the room is complete mixing condition,
determine how many person could occupy the room and not exceed the desired CO2 level.
(1 ppm = 1 part per million = 1Å~10-6 per unit volume)
In: Mechanical Engineering
The critical dimension on a machined hole must be 0.5025 in. The machining process can reliably create holes with a known standard deviation of 0.005 in. A random sample of 15 holes has an average diameter of 0.5062 in.
(a) With 97.5% confidence can you conclude that the mean hole diameter is larger than 0.5025 in?
(b) At what confidence level would you change your conclusion? What is the term for the alpha value that is associated with that value?
In: Mechanical Engineering
A simple Rankine cycle is operating between the 12.5 MPa on the high pressure side and 9.93 kPa on the low pressure side. The temperature entering the turbine is 550 degrees Celsius. Find the quality exiting the turbine and the overal thermal efficiency.
In: Mechanical Engineering
A.How to manufacture ceramics of complicated dimension features (i.e., cellular, porous, scaffold) since they cannot be machined or cut?
B. How to print metal materials at room temperature? (open questions, think about phase diagram and check periodic table)
In: Mechanical Engineering
I had to teardown a stapler and figure out how all the part wor together, bit cant seem to get how it all works together , like involving the sprngs and everything.
this is the question i need help with:
How do the parts work together? (of a stapler)
In: Mechanical Engineering