It is proposed that a model study be carried out on a proposal low-speed airfoil that is to fly at low altitudes at a speed of 50 m/s. If a 1:10 scale model is to be constructed, what velocity should be used in a wind tunnel? Comment as to the advisability of such a test. Would it be more advisable to perform the test in a 20?C water channel? If a water channel study were undertaken, calculate the drag ratio between the model and prototype.

how to calculate forces on cam and follower at various cam speed and angle.Cam and follower with SHM motion.What are the formula available

Quenching is often used in the manufacturing and/or heat treatment of magnesium alloys, aluminium alloys and steels.

Explain why quenching is used for each of these three metals, and explain how this benefits the final mechanical properties.

Outside air at 10 degC, 1 bar and 40% relative humidity enters an air conditioner operating at steady state with a mass flow rate of 1.5kg/s. The air is first heated at essentially constant pressure to 30 degC. Liquid water at 15 degC is then injected, bringing the air to 25 degC, 1bar.

Determine

(a) the rate of heat transfer to the air passing through the heating section, in kJ/s.

(b) the rate of water is injected, in kg/s.

(c) the relative humidity at the exit of the humidification section.

Kinetic and potential energy can be ignored.

Problem 12.87 Text book: Principle of Engineering Thermodynamics, SI Version, 7th Edition Authors: Moran, Shapiro, Boettner and Bailey

In regards to the metal extrusion manufacturing process:

1. How would you ensure that you obtained a fine-grained microstructure in a metal casting? Carefully explain the mechanism/s that lead to the fine grain size.

Materials Engineering Question

Suggest the optimal heat treatment and condition for 0.45 wt.% steel required, to produce what you consider to be the best combination of properties for a “Chef’s Knife”. Explain your answer and use any literature required to justify it.

Friction is extremely difficult to control. If excessively regulated, leads to exhaustive wear, while if loosely regulated, leads to ineffective maneuvers. As a mechanical engineer, you are to design a web handling device meant to transport the flexible films for monitor screens. Elaborate with the support of suitable diagrams the phenomena of wear that you should keep in consideration when designing the web handling device, and the sub- components associated with it. In your elaboration, at least provide three types of available wear in that web handling device to justify their differences

Discuss the sensitivity of modulus to shear correction factor and span to depth ratio in a short beam shear and flexure lab

Water at 0.15 MPa if the water is 0.25% between liquid and vapor what is the specific volume, Energy, Enthalpy and Entropy?

A large Factory space has an average occupancy of 45 people (only male workers in this space) they are doing light bench work. The average light level is 1.5W/ft² of recessed, vented to return air fluorescent fixtures. Other production equipment create a total heat gain of 3 W/ft². Compute the total sensible and total latent heat gain for the space. The floor area is 7500 ft². For the sensible heat gain, estimate the radiative and convective portions for each type of heat gain (in the unit of Btu/hr).

If a tank with water level H springs a small leak at the bottom, what will be the flow velocity?

1. Crude oil flows through an uphill section of the Keystone pipeline at a rate of 2.94 m3 /s (equivalent to 1.6 million barrels of day). The average elevation gain in the section of pipeline is 10 m per kilometer. The pipe diameter is 1.2m. The maximum allowable pressure in the pipe (at the inlet) is 8.27 MPa; the minimum pressure (at the exit) required is 3.45kPa. The crude oil has density 930kg/m3 and a dynamic viscosity of 1.68×10-2 Pa.s. For above condition consider the surface roughness factor is 0.26 mm. Determine the maximum possible distance between pumping station with and without elevation gain. Use Haaland equation for friction factor.

A beam of light hits a 2.36cm thick silicate glass plate at an angle of 64 degrees (as measured from the normal to the surface of the glass). If the coefficient of linear absorption is 0.019 cm-1 and the index of refraction is 1.417, what fraction of light is passed through the plate. The answer should have three decimals of accuracy.

You Answered: .867 Correct Answer 0.888 You will need to calculate the actual distance the light travels in the plate, do not just use the thickness. Don't forget to include Snell's law as needed.

how did they get 0.88

Find the length of a 0.5 in. schedule 40 pipe required to heat water from 60 deg. f to 160 deg. f using condended steam at 260 deg f given water flowing at 600 lb/min.

1.

A common difference between proscenia and masking is …