A six-station rotary indexing machine performs the machining operations shown in the table below, with processing times and breakdown frequencies for each station. Transfer time is 0.15 min. A study of the system was undertaken, during which time 2000 parts were completed. The study also revealed that when breakdowns occur, the average downtime is 7.0 min. For the study period,

determine: 1) Average hourly production rate______________. 2) Line uptime efficiency______________. 3) How many hours were required to produce the 2000 parts__

(A) Give industry and household examples from your experience of devices that simplify installation and attachment, and that eliminate trial-and-error adjustment.

(B) Give examples from your experience of situations where trial-and-error adjustment could be eliminated by simple means.

A mass of 3 kg of saturated liquid-vapor mixture of water is contained in a piston-cylinder device at 175 kPa. Initially, 2 kg of the water is in the liquid phase and the rest is in the vapor phase. An electrical heater is in operation, and the piston rises until it hits a set of stops, which are set at double the initial volume. Electrical heating continues until the pressure reaches 500 kPa. Determine (a) the initial and final temperatures, (b) the mass of liquid water when the piston first hits the stops, and (c) the electrical work done during this process. Show all equations.

A mass of 3 kg of saturated liquid-vapor mixture of water is contained in a piston-cylinder device at 175 kPa. Initially, 2 kg of the water is in the liquid phase and the rest is in the vapor phase. An electrical heater is in operation, and the piston rises until it hits a set of stops, which are set at double the initial volume. Electrical heating continues until the pressure reaches 500 kPa. Determine (a) the initial and final temperatures, (b) the mass of liquid water when the piston first hits the stops, and (c) the electrical work done during this process. Show all equations.

ASSIGNMENT 1

TOPIC: INTRODUCTION OF FLUID MECHANICS

QUESTION 1: 10 MARKS

In your own words, explain what have you learnt from fluid mechanics course.

QUESTION 2: 40 MARKS

Refined crude oil has been used to lubricate moving parts in a wide variety of machines and engines. These petroleum-based lubricants are extracted from natural crude oil, and must be refined, desalted, dewaxed, and distilled from crude feedstock. However, recently, engineers are moving towards non-petroleum based lubricants or known as synthetic lubricants. Obtain information about non-petroleum based lubricants and summarize your findings in a brief report by following the format given below. The report should contain minimum 1500 words (excluding figure and table title and content, references)

QUESTION 3: 50 MARKS

It is predicted that nanotechnology and the use of nano sized objects will improvise many processes and products. Among new new nanotechnology areas is that of nano scale fluid mechanics or known as nanofluid. Fluid behavior at the nano scale can be entirely different than that for the usual everyday flows. Obtain various information of nano fluid mechanics and summarize your findings in a brief report by following the format given below. The report should contain minimum 1700 words (excluding figure and table title and content, references)

Determine the changes in length, breadth, and thickess of a steel bar which is 5m long, 40mm wide and 30mm thick and is subjected to an axial pull of 35kN in the direction of its length. Then find the volumetric strain and final volume of the given steel bar. (Take E= 200000 N/mm2 and poisson ratio (v) = 0.32)

In a manufacturing process, stainless steel cylinders (AISI 304) initially at 600K are quenched by submersion in an oil bath maintained at 300K with h=500W/m²-K. Each cylinder is of length 2L=60 mm and diameter D=80mm. Consider a time 3 min into the cooling process and determine the temperatures at the center of the cylinder, at the center of the circular face and at the mid height of the site. (Use the Heisler charts to answer these questions). You may evaluate properties at the mean temperature of T_m=450K.

A large block having the properties of a chrome brick at 200^oC is at uniform temperature of 30^oC when it is suddenly exposed to a constant surface flux of 3x10⁴ W/m². For this case, determine:

a. The temperature at a depth of 3 cm after a time of 10 min

b. The surface temperature at this time

An air compressor rapidly fills a 0.3m3 tank (there is no heat transfer through the tank walls), initially containing air at 27 ?C, 1 atm, with air drawn from the atmosphere at 27? ?C, 1 atm. During filling, the relationship between the pressure and specific volume of the air in the tank is pv1.4 = constant. You can model the air as an ideal gas with constant specific heats at 300K.

Calculate (and show your work) the tank’s pressure and temperature, and the

work input to the compressor for the case of m/m1 = 1.5, where m1 is the initial mass in the tank and m is the mass in the tank at any time after filling starts

Plot the pressure, in atm of the air within the tank versus the ratio of m/m1

Plot the temperature, in ?C, of the air within the tank versus the ratio of m/m1

Plot the compressor work input, in Btu, versus m/m1.

For all three graphs, let m/m1 vary from 1 to 3 in increments of 0.1

An air compressor rapidly fills a 0.3m3 tank (there is no heat transfer through the tank walls), initially containing air at 27 ?C, 1 atm, with air drawn from the atmosphere at 27? ?C, 1 atm. During filling, the relationship between the pressure and specific volume of the air in the tank is pv1.4 = constant. You can model the air as an ideal gas with constant specific heats at 300K.

Calculate (and show your work) the tank’s pressure and temperature, and the

work input to the compressor for the case of m/m1 = 1.5, where m1 is the initial mass in the tank and m is the mass in the tank at any time after filling starts

Plot the pressure, in atm of the air within the tank versus the ratio of m/m1

Plot the temperature, in ?C, of the air within the tank versus the ratio of m/m1

Plot the compressor work input, in Btu, versus m/m1.

For all three graphs, let m/m1 vary from 1 to 3 in increments of 0.1

Water at p₁ = 20 bar, T₁ = 400^oC enters a turbine operating at steady state and exits at p₂ = 1.5 bar, T₂ = 220^oC. The water mass flow rate is 4000 kg/hour. Stray heat transfer and kinetic and potential energy effects are negligible.

Determine the power produced by the turbine, in kW, and the rate of entropy production in the turbine, in kW/K.

Draw the electrical circuit diagram of electromagnetic forming, label it neatly and explain how a thin cylinder can be expanded or compressed by this process.

A solid cylinder of 6 inch diameter and 4 inch high is compressed axisymmetrically to 2 inch high.
a) Calculate the final diameter of the product, the three orthogonal strains and the Von Mises strain.
b) Estimate the maximum total force required for this operation. Assume: coefficient of fricition 0.2; Use Ludwik's Law to find the pressure at maximum axial strain; the strength coefficient of the workpiece: K is 147 ksi, strain hardening exponent is 0.17.

What is the percentage change in the R-value of the window if double glazed window is used with 6.4 mm and 12.7 mm air in between as compared to single glazed window? Does the resistance increase linearly with the thickness of the space?.