A spring loaded piston cylinder contains 1.5 kg of air at 27°C and 160 kPa. It is
now heated in a process where pressure is linear in volume, P = A + BV, to twice the
initial volume where it reaches 900 K. Find the work, the heat transfer and the total
entropy generation assuming a source at 900 K. Is this a possible process?

The following description applies to the next three problems.

Air enters steadily an electrical hair dryer at 100 kPa and 27 C. It leaves the hairdryer at a temperature of 80 C, an exit velocity of 10 m/s, and at the same pressure. The exit and inlet areas are 20 cm² and 40 cm² respectively.

(Assume properties of air cp= 1.007 kJ/kg.K, cv = 0.72 kJ/kg.K, and R= 0. 287 kJ/kg.K )

The mass flow rate of air entering the hairdryer, in kg/s, is closer to

The velocity of the air at the inlet of the hairdryer, in m/s, is closer to

The total power the hairdryer needs to operate at the stated conditions, in kW, is closer to:

1.A materials fatigue resistance can be improved by

2.What test is used to determine the toughness of a material under shock loading?

3.Martensite

I need sample lab report for method of joints

Steam at 5MPa and 300°C enters a turbine in a steady flow manner, from the turbine the steam expands to 200kPa with a quality of 90%. Find the following:

1. The work done by the steam to the turbine in kj/kg
2. The amount of steam flow rate needed in kg/hr if the turbine produces 200kW of power
3. The efficiency of the expansion process

Topic: Agitation

A flat-blade turbine agitator with disk having six blade is installed in a tank. The tank diameter (D_t) is 1.83 m, the turbine diameter (D_i) is 0.61 m and the width (w) is 0.122 mm. The tank contains four baffles, each having width (J) of 0.15 mm. The turbine operate (N) at 90 rpm and the liquid in tank has a viscosity (u) of 10 cP and a density (p) of 929 kg/m³. It is desired to design a small pilot unit with a vessel volume (V) of 2.0 L so that effects of various process variables on the system can be studied in the laboratory. The rate of the mass transfer appear to be important in this system so the scale-down should be on this basis. Design the new system specifying sizes, rpm and power.

Include all calculations and graphs if possible . Thank you.

A company is considering two methods for obtaining a certain part. Method A will involve purchasing a machine for $40,000 with a life of 5 years, a $2,400 salvage value, and a fixed annual operating cost of $8,000. Additionally, each part produced by the method will cost $8. Method B will involve purchasing the part from a subcontractor for $30 per part. At an interest rate of 10% per year, determine the number of parts per year required for the two methods to break even. (Enter your answer as a number without the dollar $ sign.)

Polymer-matrix composites (PMCs) which consist of strong fibers embedded in a
resilient plastic that holds them in place are used in the greatest diversity with
applications ranging from commercial aircraft to bath tub. Comment the main drawback
of fiber reinforced PMCs compared with metallic materials.

1. Describe the effect of composition and temperature on the equilibrium structure of aluminum alloys containing up to 8% copper?

2. Explain the precipitation hardening of aluminum copper alloys by reference to the heat treatment cycles.

3. Compare the mechanical properties of aluminum 4% copper alloy in the as – cast, solution treated, quenched, quenched and aged and over aged conditions.

For the case " Insulated process plant piping (carbonsteel) " define in details the material aspect and environment aspect. Environment is not limited to chemistry but also to process parameters.

Subject = Materials Integrity and Corrosion

can you me 5 entropy sources can be found in house and how to lessen those 5 entropy generation

*can you give me

The helicopter shown in the figure below has a mass of 12 tons and it needs to rotate its 14 meter blades (diameter of the blades = 14 meters) at 670 rpm just to hover (stand still in mid air) without any additional load. The air flow caused by the rotation of the helicopter blades may be modeled as a moving cylindrical body of air having a 14 meter diameter. The average velocity of the airflow of that cylindrical air-body is proportional to the rotational speed of the helicopter blades (RPM).
Determine the airflow rate when the helicopter hovers and the power that its engines produce.
If the helicopter is now loaded with an 8 tons load as shown in the figure. Determine again the airflow rate when the helicopter hovers and the power that its engines produce.

A copper wire is strung between two plates. Find how hot the air can be before the wire starts to melt. Given: h = 20 W/m2/K k= 415 W/m/K The temperature of the plates is 100 C The melting temperature of copper is 1100 C. it has a length of 30mm and thickness of 1mm

In an industrial process, it is required to maintain 30°C dry bulb temperature with high relative humidity equals to 60%. Determine the following air properties when the barometric pressure is standard, a) Dew point temperature; b) Specific humidity; c) Enthalpy of mixture per kg of dry air. d) Vapour density; e) Degree of saturation; f) Wet bulb temperature.