What is the effect of increasing feed and speed on (i) machining rate and (ii) tool life

Differentiate turning, milling, and drilling in terms of (i) purpose, (ii) feed stock geometry, and (iii) orientation and direction of motion of tool with respect to part.

A continuous evaporator is operated with a given feed material under conditions in which the
concentration of the product remains constant. The feed rate at the start of a cycle after the
tubes have been cleaned has been found to be 5000 kg/h. After 48 h of continuous operation,
tests have shown that the feed rate decreases to 2500 kg/h. The reduction in capacity is due to
true scale formation. If the downtime per cycle for emptying, cleaning, and recharging is 6 h,
how long should the evaporator be operated between cleanings in order to obtain the maximum
amount of product per 30 days?

Get the avehighs.txt file from BB. The file contains monthly average temperatures from three different locations. The location ID is in the first column and monhtly average temperatures are in the next 12 columns. Write a script that will:

data from file

avehighs

432 33 37 42 45 53 72 82 79 66 55 46 41
777 29 33 41 46 52 66 77 88 68 55 48 39
567 55 62 68 72 75 79 83 89 85 80 77 65

1. load the data

2. call a function that will (a) plot the data on a column of subplots (b) place an x label, months, on the last plot (c) place a ylabel,Monthly Avg Temp (F), on the second plot, (d) for a bonus put a legend on each plot that indicates the location id, and (e) return the yearly average temperatures and the location ID as three two element vectors

3. Display the average yearly temp for each location.

I wish to use a B-type thermocouple to measure a temperature of 1600⁰C. I am using 100⁰C (boiling water) as my reference temperature. What is the emf expected at 1600⁰C ? (Refer to the NIST thermocouple database):

a)

11.233 mv

b.

0.033 mV

c.

11.263 mV

d.

None of the above

A roller bearing has a 22 kN radial load applied. For a life of 18000 hours at 1200 rev/min, specify the smallest suitable roller bearing to use. Assume a rotating outer ring and provide relevant source information for your selected bearing.

Argon gas enters an adiabatic compressor at 16.0 psia with 99 F with a velocity of 49.9 ft/s. It exits at 225 psia and 209.5 ft/s. If the isentropic efficiency of the compressor is 83.1%, determine:

a) the exit temperature (R) of the argon

b) the work input to the compressor (Btu/lbm)

A Rankine cycle with reheat produces 1 MW of net power. The boiler operates at 15 MPa and has an outlet temperature of 800 K. The condenser operates at atmospheric pressure (1 atm). The operating point of this cycle is such that the water exiting the low pressure turbine has no liquid present to prevent damageto the turbine (hint: what does this say about quality at this point?). Assume the pump and second turbine stage are both isentropic, but the first turbine stage has an isentropic efficiency of 90%. Assume the steam is reheated at a pressure of 1 MPa.

Find:

(A)The mass flow rate of steam through the turbines

(B)The required heat input

(C)The required flow rate of fuel given a heating value of 50 MJ/kg

(D)Plot the state points on a T-s diagram with lines of constant pressure at the boiler,reheat, and condenser pressures.

Explain how Doppler (Fuel Temperature Coefficient) changes as fuel temperature rises. Why does this occur? A picture will be helpful.

Show to use ode45 built-in function in MATLAB to solve the following ODE problem:

dydx=x^2 / y y(0)=2  

Calculate y(x) for 0 ? x ? 20 and compare the results to analytical solution y = sqrt((2x^3 / 3) + 4)

1. What has the greatest influence on the length and detail of a process plan, and why?

2. What usually determines the way a process plan starts out?

1)Describe what a “riser” is in the context of sand casting.

What are its functions?

In light of Chvorinov’s rule, what should be taken into account when determining the geometry, dimension, and location of a riser in a sand casting mold?

1)Describe what a “riser” is in the context of sand casting.

What are its functions?

In light of Chvorinov’s rule, what should be taken into account when determining the geometry, dimension, and location of a riser in a sand casting mold?

The spectral absorptivity of a large diffuse surface is ????=0.850 for ??<1???? and ????=0.25 for ???1????. The bottom of the surface is well insulated, while the top may be exposed to one of two different conditions.
(a) In case (a) the surface is exposed to the sun, which provides an irradiation of ????=1200 W/m2, and to an airflow for which T = 300 K. If the surface temperature is Ts =320 K, what is the convection coefficient associated with the airflow?
(b) In case (b) the surface is shielded from the sun by a large plate and an airflow is maintained between the plate and the surface. The plate is diffuse and gray with an emissivity of ????=0.8. If ???=300 K and the convection coefficient 30 W/m2K, what is the plate temperature Tp that is needed to maintain the surface at Ts =320 K?
(c) in case (b) the large surface and the plate both have a dimension of 8m by 8m, and the separation distance is 2m. The other conditions remain the same. What would be the plate temperature that is needed to maintain the surface at Ts=320K?