The strains of prismatic beam made of extruded polycarbonate were measured using multiple strain gauges. When loaded at room temperature, normal strains are 200us and 100us, while the shear strain is 45us. The modulus of elasticity is 2.38GPa, the mass density is 1200kg/m3 , the glass transition temperature is 147°C, and the shear modulus is 0.96GPa. Determine all six independent components of the stress tensor. Clearly list all your assumptions.

Complete combustion of 1 kmol of PROPANE GAS with 0% excess air produces (?????) kmol of carbon-dioxide gas. (enter a decimal number)

A C-D nozzle is to be designed to produce a flight Mach number of 3.0 for the atmospheric conditions (pressure and temperature) at 15 km altitude in the test section of a supersonic wind tunnel. The diameter of the test section is 10 cm. Assume the gas has Y(gamma) = 1.4 and R = 2.077 kJ/kg*K, determine (a) the mass flow rate that must be provided, (b) the nozzle throat area, (c) the reservoir temperature and (d) the reservoir pressure.

Determine the final temperature and pressure of a mixture of CO₂ (MW=44) and nitrogen if 3 kg of CO₂ at 20°C and 1.5 MPa is mixed with 1 kg of nitrogen at 100°C and 0.75 MPa. Use c_v of CO₂ as 0.656 kJ/kg K and c_v of nitrogen as 0.752 kJ/kg K. The process can be considered to be adiabatic.

For storage options a, b, and c, what volume of storage tank for hydrogen would be needed for a hydrogen fuel cell car to have the same delivered transport energy (that is, total vehicle-km of travel) as a conventional car with a full 50 litre petrol tank (note that the actual volume of the tank is more than 50 litre). a- If the hydrogen is stored as compressed gas at a pressure of 350 bar (1 bar = 101 kPa) b- If the hydrogen is stored cryogenically as a liquid c- If the hydrogen is stored in a metal hydride in solid form Important assumption and information required to answer this question: • The energy content of hydrogen (HHV) is 142 MJ/kg (~40 kWh/kg)The average energy efficiency of the fuel cells used is 44% (based on HHV), and that of the electric motors 86%. • Note that the following gravimetric and volumetric energy storage figures are based on 50% fuel cell energy efficiency, but the energy efficiency that you need to use (based on question 2) in order to answer this question is 44%, HHV. Assumptions for the volumetric and gravimetric electrical energy densities of different hydrogen energy storage options based on 50% electrical energy efficiency (HHV) for the fuel cell: - High-pressure hydrogen at 350 bar: 0.75 kWhe/kg and 0.35 kWhe/litre - Cryogenic hydrogen storage 1.46 kWhe/kg and 0.89 kWhe/litre - Metal hydride 0.5 kWhe/kg and 0.5 kWhe/litre.

nswer the following questions:

1. What is PFCU functions and State the advantage and Disadvantages of PFCU?

2. What do you understand about fly by wire?

Answer the questions in paragraph form.

Saturated water vapor at 300°F enters a compressor operating at steady state with a mass flow rate of 5 lb/s and is compressed adiabatically to 750 lbf/in.²


If the power input is 2150 hp, determine for the compressor:

(a) the percent isentropic compressor efficiency and

(b) the rate of entropy production, in hp/°R.

Ignore kinetic and potential energy effects.

Objective question :-

The function of air conditioning system is

(A) Cooling and humidification
(B) Cooling and dehumidification
(C) Heating and humidification
(D) Heating and dehumidification

Draw a Koch Snowflake fractal image using MATLAB programming.

I'm pretty new to MATLAB and im not too familar with how all the plotting and drawing functions work.

2. The surface of a 0.1% C steel gears is to be hardened by carburizing. In gas carburizing, the gears are placed in an atmosphere that provides 1.2% C at the surface of the steel at a high temperature. Carbon then diffuses from the surface into the gear. For optimum properties, the steel must contain 0.45% C at a depth of 0.2 cm below the surface. Design a carburizing heat treatment schedule that will produce these optimum properties. Assume that the temperature is high enough (at least 900°C) so that the iron has the FCC structure.

1) A reciprocating compressor has two stages with inlet air going into LP stage at 1 bar, 16°C and at the rate of 12 m3/min. Air is finally delivered at 7 bar and there is perfect intercooling at optimum pressure between the stages. The index for compression is 1.25 and compressor runs at 600 rpm. Neglecting clearance volume determine intermediate pressure and total power required.

2) A reciprocating compressor of single stage and double acting type has free air delivered at 14 m3/min measured at 1.013 bar, 288 K. Pressure and temperature at suction are 0.95 bar and 305 K. The cylinder has clearance volume of 5% of swept volume. The air is delivered at pressure of 7 bar and expansion and compression follow the common index of 1.3. Determine the volumetric efficiency with respect to free air delivery.

3)1)Single stage impulse turbine has equal blade angles and nozzle angle of 15°. Determine the maximum possible blade efficiency if the blade velocity coefficient is 0.85. Determine the blade speed to steam velocity ratio if the actual blade efficiency is 90% of maximum blade efficiency.

4) The velocity of steam entering a simple impulse turbine is 1000 m/s, and the nozzle angle is 200. The mean peripheral velocity of blades is 400 m/s and the blades are symmetrical. If the steam is to enter the blades without shock, what will be the blade angles. Neglecting the friction effects on the blades, calculate tangential force on the blades and the diagram power for a mass flow of 0.75 kg/s. Estimate axial thrust & diagram efficiency.

5)1)Single stage impulse turbine has equal blade angles and nozzle angle of 15°. Determine the maximum possible blade efficiency if the blade velocity coefficient is 0.85. Determine the blade speed to steam velocity ratio if the actual blade efficiency is 90% of maximum blade efficiency.

Explain why is euler theory good mathematically but not equally good mechanically. Give one example to prove your point.