A helical compression spring has 14 active coils and the free length is 12.5in. The outside diameter is 7/16 in and the spring has squared and ground ends. The end plates are constrained to be parallel. The material is music wire with presetting. The wire diameter is 0.042 in. Determine: (1) for static conditions compute the spring index, the solid length, the stress when the spring is compressed to the solid length. Check if static yielding occurs while the spring is brought to its solid length; (2) for dynamic conditions with Pmin=0.9 lb and Pmax=2.9 lb, check if the spring experiences torsional endurance limit fatigue torsional yielding, or torsional fatigue failure. Assume a survival probability of 90%, unpeened coil, and fatigue failure based on 50x103 cycles

Using Excel, plot the internal temperature of a computer chip k=1.38 W/(m-K) that generated 2,000 W of power. The chip is 10 cm wide. Assume one side is at 40^oC and the other is at 45^oC

The mean diameter of the square threaded screw having pitch of 10 mm is 50 mm. A load of 20 kN is lifted through a distance of 170 mm. Find the work done in lifting the load and the efficiency of the screw, when
1. The load rotates with the screw, and
2. The load rests on the loose head which does not rotate with the screw.
The external and internal diameter of the bearing surface of the loose head are 60 mm and 10 mm respectively. The coefficient of friction for the screw and the bearing surface may be taken as 0.08.

Find an important engineering failure that involves some of the topics discussed in MSE 350. Describe the failure, why it occurred, the damage (human, environmental, and economic) and the changes that could have been made in the design to avoid the failure. Was the failure caused by lack of engineering knowledge at the time, engineering error, or management/government error? Discuss!!

For each of the following common items, identify what they are commonly made of, the material type (composite, metal, semiconductor, polymer , ceramic, glass. Describe why that material type is used. Include at least two references for your answers (websites are fine, but try and find good ones). If more than one material type is used in the items, include them all! Be careful to use proper engineering vocabulary when answering this question!

Abrasives for grinding metal

Automobiles Integrated circuits

Airplanes Bridges

Solar panels

Latex paint

Soda bottles

Polyvinylchloride (PVC) plumbing pipe

A centrifugal compressor has 22 radial impellers with an impeller exit radius of r2 = 0.25m.
Assuming the mass flow rate through the compressor is mdot = 10kg/s, the shaft speed is
omega = 10,000 rpm, and the inlet flow is swirl free, calculate
a) the total shaft power Ps in kW
b) the total temperature rise (?Tt)in the compressor (assume ? = 1.4 and cp = 1004 J/(kg K))

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.

QUESTION 1

Tick the option which correctly describes the units of parameters defined in an operation sheet?

10 points   

QUESTION 2

What steps are necessary for Process Planning of a job shop?

10 points   

QUESTION 3

Which one of the characteristics does not define the work of a route sheet?

10 points   

QUESTION 4

Which of the statements holds true for a job shop?

10 points   

QUESTION 5

Which is one of the difficulty that Digital Simulation faces in absence of manufacturing system design?

10 points   

QUESTION 6

Which of these is a disadvantage of application of PLC in a flow shop?

10 points   

QUESTION 7

In a manufacturing system, the critical control functions are

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?

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.

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

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.

Derive the electromagnetic wave equation in terms of the magnetic field H

Briefly describe what a duct blowers function is as it applies to residential energy audits

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?