An extruded, rectangular polypropylene strut of width 9 mm, depth 3 mm and length 80 mm is to be loaded from the ends in compression along its length with a creep load of 40 N for one year. [Creep curves for polypropylene are shown below. The buckling load is given by F = (2 p/ L)2 E I. For a rectangular beam the second moment of area is given by I = (w d3) /12.].

In order to improve buckling resistance, explain with reference to the buckling equation, what changes are possible in either material or beam design, indicating any likely constraints on such changes.

Discuss the manufacturing problems (in terms of extruder system design) which must be considered in producing such a beam.

Explain “STANDARDS” and “CODES” by writing their basic characteristics (or essentials) and giving their similarities and differences (if any).

Give some case studies for Mechanical property assessment by nanoindentation technique.

A piston cylinder device with air is going through an isentropic compression. The initial pressure is 0.1 MPa and temperature is 300 K. During the isentropic compression process, the volume is decreased to 1/18 of the initial volume. Using variable specific heats, determine the pressure and temperature at the end of the compression process. What is the amount of work consumed?

Air flows in a converging-diverging nozzle. The nozzle throat area is 50 cm2. The total pressure at the nozzle inlet is 1 MPa. The total pressure at the nozzle exit is 650 kPa. The Mach number at the nozzle exit is 0.70. Find the nozzle exit area.

51.7 cm2

84.2 cm2

35.6 cm2

54.7 cm2

2. In the PLD method, among the mechanisms under which the material is ablated, I wonder what is the conditions for the exfoliation sputtering.

A proposed Ocean Thermal Energy Conversion (OTEC) plant draws heat from the ocean surface at 22°C and rejects heat to the water near the ocean bed at 4°C. What is the highest thermal efficiency the plant could achieve? [4] (b) Consider a system undergoing an adiabatic process from a fixed state 1 to a fixed state 2. Use the Second Law of Thermodynamics to prove that the maximum work is done by the system if the process is reversible. [6] (c) Steam at 20 MPa and 460°C flows at 12 kg/s into an adiabatic turbine and exits at 20 kPa. What is the maximum possible power output of the turbine? What is the temperature of the steam at the exit in that case? [5] (d) Steam at 20 MPa and 460°C flows at 12 kg/s into an adiabatic turbine and exits at 20 kPa and 85% quality. What is the isentropic efficiency of the turbine?

A one-stage rocket takes off from Space and is tasked with entering into a geosynchronous (the

period of orbit is one day) low earth orbit at an altitude of 2,000km above the surface of the Earth. The mass of the

rocket is 550,000kg,

a) At what final speed does the rocket need to be moving to achieve the specified orbit?

b) If the exhaust velocity of the fuel is 2.20x103m/s what percentage of the rocket’s mass must be fuel?

c) Given that the rocket expends fuel at a rate of 1.4x104kg/s would this rocket be appropriate for manned flights?

kindly do the stability analysis ( longitudnal, lateral stability) lift and moment coefficient for boeing 787 or boeing 777 aircraft.

a) Briefly write down the basic heat gains that make up the cooling load in items.

b) A desired feature from refrigerants is that the evaporation pressure is high and the condensing pressure is low. Explain the main reason for this by drawing the T-s diagram of a single-stage cooling cycle.

3.Write a report on AI based Social distancing monitoring using drone with out human interaction report should contain drone design it specification it's algorithm control system algorithm.minimum 10 A4 size page.No plagiarism is allowed other wise down rate is given

Consider an axisymmetric pipe flow simulation. The pipe is 40 m long in axial direction and its radius is 0.2 m. The structured mesh is used in the computational domain and it is uniformly spaced by 1000 cells in axial direction and 20 cells in radial direction. The simulation is conducted in transient and the time step size was set to 0.001 second. After running the simulation for a long time, the flow has reached a fully developed condition. The maximum axial velocity along the axis is found to be 15 m/s. The fluid is a liquid water where its density is 1000 kg/m³ and its dynamic viscosity is 0.001 kg/m-s. What is the maximum Courant number in the domain? DO NOT USE scientific notation (5 * 10^-6) or E-notation (or engineering notation, e.g. 5E-6).

10-35: A helical coil compression spring is needed for food service machinery. The load varies from a minimum of 4 lbf to a maximum of 18 lbf. The spring rate k is to be 9.5 lbf/in. The outside diameter of the spring cannot exceed . The springmaker has available suitable dies for drawing 0.080-, 0.0915-, 0.1055-, and 0.1205-in-diameter wire. Use squared and ground ends, and an unpeened material. Using a fatigue design factor nf of 1.5, and the Gerber-Zimmerli fatigue-failure criterion, design a suitable spring.

Solve Problem 10–35 using the Goodman-Zimmerli fatigue-failure criterion.