- What is the difference between MED and MSF desalination technology? If you have low grade heat source (Temperature is less than 70ºC) which one is more efficient?

To compare between different desalination system different criteria have been used such as: Performance Ration (PR), Gain Output Ratio (GOR), Specific Energy Consumption (kWh/m3 ) and Unit Product Cost ($/m3 ). Define each one and on your opinion which criteria are considered most useful?

Possible reasons and benefits of using robots in this application (Material handling/ Processing operations/ Assembly and Inspection)

Based on the reading assignment and the textbook, answer the following questions:

a- The impact of increasing the number of effects in MED system on the performance ratio (PR)? And list the reasons (10 Points)

Ideal Reheat Steam Cycle (10)

Consider a steam power plant operating on the ideal reheat Rankine cycle. Steam enters the high-pressure turbine at P_H MPa and T_H °C and is condensed in the condenser at a pressure of P_L kPa. Assume the steam is reheated to the inlet temperature of the high-pressure turbine, and that pump work is NOT negligible. If the moisture content of the steam at the exit of the low-pressure turbine is not to exceed w_% percent, determine:

(a) the pressure at which the steam should be reheated ,

(b) the total turbine work ,

(c) the net work ,

(d) the total heat input , and

(e) the thermal efficiency of the cycle .

P_H = 12.5 MPa, T_H = 550 °C, P_L = 30 kPa and w_% = 11.4%.

Course: Mechanical Vibration

Report Paper ( 1000 words)

Topic is Shakers for Aircraft Suspension Durability Testing

All material must be referenced correctly. Reference could be from Journals, Articles, Books.

Please include at least 2 or 3 reference.

Consider a steam power plant operating on the ideal reheat Rankine cycle. Steam enters the high-pressure turbine at P_H MPa and T_H °C and is condensed in the condenser at a pressure of P_L kPa. Assume the steam is reheated to the inlet temperature of the high-pressure turbine, and that pump work is NOT negligible. If the moisture content of the steam at the exit of the low-pressure turbine is not to exceed w_% percent, determine:

(a) the pressure at which the steam should be reheated ,

(b) the total turbine work ,

(c) the net work ,

(d) the total heat input , and

(e) the thermal efficiency of the cycle .

P_H = 15 MPa, T_H = 650 °C, P_L = 7.5 kPa and w_% = 9.4%.

A simple steam power cycle contains a turbine, condenser, pump and a boiler. If the turbine inlet pressure is 14 MPa and 600 °C, and the Condenser Inlet Pressure is 18 kPa, calculate the following:

1. Turbine Inlet Enthalpy (kJ/kg)
2. Condenser Inlet Enthalpy (kJ/kg)
3. Condenser Inlet Temperature (°C)
4. Pump Inlet Enthalpy (kJ/kg)
5. Boiler Inlet Enthalpy (kJ/kg)
6. Boiler Inlet Temperature (°C)
7. Turbine Work Output (kJ/kg)
8. Boiler Heat Addition (kJ/kg)
9. Net Work Output (kJ/kg)
10. Efficiency of the Cycle (%)

Work as accurate as possible. For each correct answer you receive 1 Mark, thus 10 Maximum. Choose the most appropriate answer from the lists, and then continue with the chosen answer in order to have your calculations as accurate as possible.

A simple steam power cycle contains a turbine, condenser, pump and a boiler. If the turbine inlet pressure is 14.5 MPa and 550 °C, and the Condenser Inlet Pressure is 19 kPa, calculate the following:

1. Turbine Inlet Enthalpy (kJ/kg)
2. Condenser Inlet Enthalpy (kJ/kg)
3. Condenser Inlet Temperature (°C)
4. Pump Inlet Enthalpy (kJ/kg)
5. Boiler Inlet Enthalpy (kJ/kg)
6. Boiler Inlet Temperature (°C)
7. Turbine Work Output (kJ/kg)
8. Boiler Heat Addition (kJ/kg)
9. Net Work Output (kJ/kg)
10. Efficiency of the Cycle (%)

Work as accurate as possible. For each correct answer you receive 1 Mark, thus 10 Maximum. Choose the most appropriate answer from the lists, and then continue with the chosen answer in order to have your calculations as accurate as possible.

A converging-diverging rocket nozzle is connected to a combustion chamber filled with gas at a total pressure of 1200 kPa and a total temperature of 2400 K. The design exit Mach number is 2.9 and the nozzle throat area is 50 cm2 . Assume the gas behaves as an ideal gas with k = 1.3 and a molecular weight of 24 kg/kmol. Determine (a) The back pressure necessary to induce the design Mach number at the nozzle exit. (b) The design exit area for isentropic supersonic flow. (c) The static pressure at the throat when the flow is choked. (d) The mass flow rate through the nozzle when the flow is choked.

6. a. Using a machine element , describe fatigue in engineering materials . Why is fatigue loading more dangerous than normal loading. As a design engineer, how can you prevent failure by fatigue.
d. A building collapsed in a city last month. List all possible reasons that could have caused the failure and how these could have been prevented.

c. What is the effect of extreme temperatures (too low or too high) on the property of material ( yield strength, ductility, toughness, brittleness , fatique strength)

Q : It is desired to maintain the temperature of hospital room at 24 degree centigrade at all the time . The size of the room is 12x12 having 2 ton Air conditioner and 1200 watt heater.

A) discuss proper mechanism so that the temperature should not exceed 24 degree centigrade at any condition ( Hot or cold weather ).

B) suggest and draw a block diagram for temperature control system for hospital room

5 a. A hollow circular cylinder is made of cast iron and has an outside diameter of 120mm and inside diameter of 95mm. The length is 960mm. It is subjected to an axial tensile load of 160kN. Determine the normal stress and extension of the cylinder if the Modulus of elasticity is 230GPa.

b. A hollow bar of rectangular cross section has an external cross section of 30cm by 55cm with a thickness of 10cm. It is subjected to and internal pressure of 2.3MPa, bending force of 8kN acting over a distance of 3m and a torsional load of 35kNm. Determine the maximum tensile and shear stresses. Using a factor of safety of 6, whatis the maximum allowable combined stress in the bar.

The theory of viscoelasticity is used to describe the behaviour of materials in liquid phase.
a. Describe an industrial application where viscoelasticity occurs.
b. Describe any two models of viscoelasticity
c. For each of the models, identify a real life engineering problem where it is applied and describe this.
d. How can the knowledge be used in design applications for the problem you identified
above.
e. What are the challenges in the use of the knowledge for solving practical problems.

A wing designer comes up with two wing designs with different efficiency factors for a highaltitude
reconnaissance aircraft. The aircraft flies in steady, level flight at low subsonic cruise
speeds so that it can obtain better images of the ground underneath. If the weight, engine
thrust, aircraft speed and altitude are fixed, and induced drag is always the same fraction of
the total drag, derive a relationship between wing span and efficiency factor.