1. Describe 3 different cases having corrosion by determining the material (the alloys with the codes and composition), describing the component having corrosion, the environment making corrosion to the component. You will give suggestions to the user that will solve the corrosion problem. However, there are some constraints that you need to check. - The reasons for the corrosion should be different for all cases. - The environment, the material, the component should be different for all situations. - The suggestions that solve the corrosion problem should be different for all situations. - There is no option for changing the material.

2. Write a question about composite materials and then solve the question. To do that follow the steps described below. - State the host material and fiber type. - State the composition of the composite material. - State type of fiber arrangement. - Give a reasonable modulus of elasticity for both of the materials. - State the cross-sectional area of the composite material. - State the direction of the fiber. - State the applied stress. After giving all these properties. -Compute the modulus of elasticity of the composite material. -Compute the loading carried by the fiber and the host material. -Compute the strain sustained by the fiber and the host material.

At the beginning of the compression process of an air-standard Otto cycle, p₁ = 1 bar and T₁ = 300 K. The compression ratio is 8.5 and the heat addition per unit mass of air is 1200 kJ/kg.


Determine:

(a) the maximum temperature of the cycle, in K.

(b) the net work, in kJ/kg.

(c) the percent thermal efficiency of the cycle.

(d) the mean effective pressure, in kPa.

Moist air at 55 oF dry bulb temperature and 40% relative humidity is first heated through a heating coil. The air is then adiabatically humidified by saturated water vapor at 4.5 psia. The exit air has a dry bulb temperature of 90 oF and wet bulb temperature 65 oF. Air is supplied at a volume flow rate of 478.5 cfm. Assume sea level pressure throughout. Determine the following.

a) Show the inlet and outlet air condition clearly on the psychrometric chart clearly marking them as 1 and 2 respectively.

b) Show the sensible heating process and humidification process on the psychrometric chart clearly marking them. Draw the overall process line.

c) Calculate the heat transfer rate of the heating coil. Show your calculation.

d) Calculate the mass flow rate of the water vapor. Show your calculation.

e) What is the SHF value? Show clearly how you obtained it.

1.Write the Bernoulli equation and state all the assumptions used in its derivation.

2.Write the vector form of the conservation of momentum equation for a control volume that is moving with a constant velocity.

3.) Water is flowing in a fire hose with a velocity of 1.0 m/s and a pressure of 200000 Pa. Use the Bernoulli equation to calculate the velocity of the water exiting the nozzle. Note: Derive the expression before plugging in numbers and clearly state all your assumptions.

4.Through a refinery, fuel ethanol is flowing in a pipe at a velocity of 1 m/s and a pressure of 101300 Pa. The refinery needs the ethanol to be at a pressure of 2 atm (202600 Pa) on a lower level. How far must the pipe drop in height in order to achieve this pressure? Assume the velocity does not change. (Hint: Use the Bernoulli equation. The density of ethanol is 789 kg/m3 ). Derive the expression before plugging in numbers.

An air-conditioning plant is designed to maintain a room at a condition of 20oC dry bulb and specific humidity 0.0079 when the outside condition is 30oC dry bulb and 40% percentage saturation and the corresponding heat gains are 18000 W (sensible) and 3600 (latent). The supply air contains one-third outside air by mass and the supply temperature is to be 15oC dry bulb. The plant consists of a mixing chamber for fresh and recirculated air, an air washer with chilled spray water with an efficiency of 80%, an after heater battery and supply fan. Neglecting temperature changes in fan and ducting, calculate:
a. The mass flow rat of supply air necessary;
b. The specific humidity of the supply air;
c. The cooling duty of the washer;
d. The heating duty of the after heater
(use the psychrometric chart assuming the barometric pressure is 1.001325 bar)

Composites:

1. Properties of a material that make it useful for engineering uses
2. Typical applications for the material
3. A brief discussion of how the material is produced
4. Advantages of the material in its typical uses
5. Disadvantages of the material in its typical uses & how design engineers overcome them

what are the four different mechanisms in a steam engine? explain them.

ABCD is a four bar chain with link AD fixed. The lengths of the links are AB = 62.5 mm;
BC = 175 mm; CD = 112.5 mm; and AD = 200 mm. The crank AB rotates at 48 rad/s
clockwise. Draw the velocity and acceleration diagram when angle BAD = 60° and B and
C lie on the same side of AD. Find the angular velocity and angular acceleration of links
BC and CD.

A horizontal jet of oil (SG = 0.6) strikes a curved blade that turns the flow through an angle of 180⁰. The jet area is 1000 mm² and its speed from a stationary nozzle is 35 m/s. The blade is moving toward the nozzle at 15 m/s. Determine the force on the blade from the jet (a) in horizontal direction, Rx in kN and (b) in vertical direction, Ry in kN. [Consider the relative jet velocity in calculations]

Air cargo has experienced a renaissance in the last several years because of skyrocketing international e-commerce amid heightened consumer expectations and reduced oil prices. Additionally, airfreight has become increasingly competitive against other modes of transportation in recent years. Discuss how air cargo should be forecast in 20 years and develop a schematic diagram on the future plan of cargo infrastructure with consideration of air traffic forecast

The sample measurements for Aluminum, Copper and Nylon have the same length, width, and thickness. While the length is 76.5mm and the width is 19.5mm, the thickness of these samples are about 0.127 mm.
How might these specimens behave differently if they were thick?

A 4500 lb SUV is traveling at 65 mph when it strikes a staged attenuator designed to produce three different energy dissipation rates. For the first 6 ft, the attenuator produces a force of 20,000 lb on the impacting vehicle. The second stage is 4 ft long and produces a deceleration force of 40,000 lb. “How long does the attenuator’s 3rd stage have to be to safely stop the SUV if its deceleration force is 60,000 lb. Construct the a-s, a-t, and v-t curves for this impact. (Hint: safely stopping the SUV means the vehicle stops before using up the 3rd stage.)