Develop a simple MIS (Management Information System) that consists of a simple database (a text file). The system manages to dynamically input record/data into the database. The data from the database can be sorted, searched and updated. User also should be able to add new records/data, remove any data and etc.
Here are some ideas of MIS that can be developed:
1. Hotel reservation system.
2. Students management system.
3. Payroll management system.
4. Bus/Railway/Plane ticketing system.
5. Clinic record management system.

A solid propellant rocket engine gases at 3000 K stagnation temperature and 6000 kPa stagnation pressure It manufactures. The exit and throat areas of the nozzle are 0,01 m2 respectively. and 0.005 m2 Adiabatic base of the produced gases 1,4 and the gas constant is 320 J / kg.K. Find the thrust produced by the rocket at a height of 25 000 m (kN).

Give a step by step process of veryfying that a component under a set of loads will not fail.
Soild Mechanics course question

Determine the mass flow rate of the refrigerant flowing through the condensor of a two-stage compression refrigeration cycle (in kg/s). The fraction of the refrigerant that evaporates as it is throttled to the flash chamber is 0.19. The enthalpy of the refrigerant entering the evaporator is 55.14 kJ/kg and the enthalpy of the refrigerant leaving the evaporator is 239.19 kJ/kg. The amount of heat removed from the refrigerated space is 28 kW. (Round your answer to three decimal places).

1. Residual stress refers to stresses induced by plastic strain. T or F
2. Failure criteria is identical for ductile and brittle materials. T or F
3. Statically indeterminate problems can be solved by using additional equations provided by Hooke's Law. T or F.
4. To analyze stress at any point of any component or structure , one should consider:
5. The stress developed in a cylindrical pressure vessel along the longitudinal axis is:

Q8. 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.

1. One important point for an automobile radiator design is to cool the engine while moving at 50 km/h on a 7% grade road in a desert summer condition. Your responsibility as a design engineer is to make sure that the coolant (water in this case, since it is the hot summer time, no antifreeze is needed) temperature at the radiator inlet does not exceed the saturation temperature of water at this point. Consider a radiator that can be approached as a cross – flow heat exchanger with both fluids unmixed and working under the following conditions:

The manometer reading at the radiator water inlet is 100 kPa (the gage pressure!) where the local atmospheric pressure is also 100 kPa.

The engine heat rejection rate: q = 40 kW.

For air; flow rate 2700 kg/h, inlet temperature 52 ℃, specific heat 1008 J/kg.K.

For water; flow rate 5130 kg/h, specific heat 4244 J/kg.K.

For the radiator UA = 1134 W/K.

1. Determine the water inlet and outlet temperatures and air outlet temperature from the radiator. (15 P)
2. Determine the logarithmic mean temperature difference correction factor F and estimate the value of corrected logarithmic mean temperature difference for the radiator. (10 P)
3. Neglecting the pressure losses within the radiator, determine whether the design is safe or not against overheating (against boiling within the radiator). (15 P)
4. One effective way of obtaining safe operating conditions against radiator overheating may be increasing fan power to obtain higher air flow rates. If your findings for Part c) indicate unsafe operating conditions, determine the minimum air flow rate that ensures safe operation against the radiator overheating. To do this, increase the air flow rate with 90 kg/h intervals, until yuo reach safe operating conditions, while keeping the other parameters fixed at the above given values. (15 P)

1. A low quality coal known as Saray lignite has the components of C = 45%, H = 4%, O = 17%, S = 4%, N = 2%, A = 13% and W = 15%. Carry out the following analyses for this lignite:

1. Using the exact formula determine the heating value. (5 P)
2. Draw the Ostwald dagram in a scaled manner. (10 P)
3. After the combustion, 6% CO₂ and 10% CO contents are measured in the stack gases. Obtain the excess air coefficient and the ratio of O₂ within the stack gases, utilizing the Ostwald diagram you drew in Part b). (10 P)
4. Determine the excess air coefficient and the ratio of O₂ within the stack gases, using the analytical relations and compare the results with the ones you obtained in Part c). (10 P)
5. In what type of boiler and under which conditions do you think this lignite should be used in the lights of above estimated values of fuel components, the excess air coefficient, and the heating value. (10 P)

2. A refrigeration machine has been designed based on R134a. The design capacity is 15 tons.   The evaporator coil design temperature is 8 oC. The refrigerant enters the compressor as a slightly superheated vapor at 15 oC. The condenser coil design pressure is 14 bar. Refrigerant enters the expansion valve as a compressed (subcooled) liquid at 44 C. Note that the temperature of the air passing over the tubing in the evaporator coil will be higher than 8 oC and the temperature of the air passing over the condenser coil will be lower than the coil temperature. Use 80% for the compressor isentropic efficiency.
a. Calculate the power required to run the compressor under these design conditions and the required mass flow rate of R134a. (30 pts)

b. Find the rate of heat transfer for the condenser (high pressure side) of the system. (15 pts)

c. Find the quality of the refrigerant as it enters the evaporator. (10 pts)



3. A small gas turbine engine is used to produce power for auxiliary systems. This is a simple gas turbine open to the atmosphere. Air enters the compressor at 1 bar, 300 K. The compressor pressure ratio is 3.5:1. After passing through the combustion chamber, the air enters the turbine at a temperature of 1300 K. Determine the mass flow rate of air needed for the turbine to produce 60 kW of power. Also determine the heat that must be generated in the combustors. (30 pts) Solar collector …

g. Crazing and peeling are defects associated with glazing process; explain how they are different, and how they can be prevented?
h. Identify at least THREE processes that are line of sight processes.
i. List at least one limitation of PVD process.
j. Identify at least one failure mechanism associated with CVD coatings.
k. Gas turbine blades are to be refurbished; identify the process(es) and major steps involved in this process.
l. Identify at least TWO limitations of flame spraying.
m. What is a comparative advantage of using plasma arc thermal spraying process?

Theory of Bernoulli ,why is p_2<p_1and v_2>v_1?

what is temperature?

what is heat?

why do we use water tower?

1. You are to do a preliminary design study for a small demonstration steam turbine power plant.
- Steam will be provided by a small steam generator fired by natural gas.   - Your system will take in steam at 30 bar and 400 oC.
- The steam passes through a two stage turbine. At a pressure of 10 bars, the steam leaves the first stage of the turbine and will pass through a reheat loop in the steam generator which will boost the temperature back up to 400 oC at this pressure. The steam will then enter the second stage of the turbine.
- When the steam leaves the turbine, the quality should be at least 95% at the turbine exit / condenser inlet.
- The design condenser pressure is 0.70 bar.   
- Heat is removed from the condenser and rejected to the environment through a cooling tower.
a) Assuming isentropic expansion, what are the temperature, enthalpy, and entropy of the steam when it leaves the first stage of the turbine? (5 pts)

b) What are the enthalpy and the entropy of the steam as it leaves the reheater and enters the second stage of the turbine? How much heat (kJ/kg) goes into the steam in the reheat process? (10 pts)

c) Based on an isentropic expansion, what will the quality be at the exit? Will it meet this design limit? (10 pts)
For the following parts use the design turbine power output of 2.5 kW.
d) What mass flow rate is required? (10 pts)

e) At what rate must heat be produced by natural gas burners in the steam generator to produce the steam at the turbine inlet, and how much heat must be produced to reheat the steam between the stages? For a heating rate range of 950-1150 BTU/scf and a cost of $8 per 100 cubic feet, what is the fuel cost per hour to run this unit? (10 pts)

f) What is the feed water pump power demand, and what is the BWR? (10 pts)

8. A closed feedwater heater may be used for deaeration. a. True b. False
9. In a reciprocating power system,   i. Material flows at a constant rate through the device and passes through a turbine to produce shaft power output, ii. Material does not flow at a constant rate through every section of the device.   iii. Power is produced at all times. iv. Power is produced only during part of the cycle in each section of the device and is not produced uniformly at every instant.   v. The power unit consists of one or more piston and cylinder sections with intake and exhaust valves and where fresh fuel and air are taken in during one part of the process, exhaust gases are ejected during another part of the process, and at other times the cylinder is closed off from the intake and exhaust sections (manifolds).   vi. The power unit consists of a compressor, a burner section, and a turbine.   a. Items i), iii), and vi) are correct. b. Items ii) and iii) are correct. c. Items ii), iv) and v) are correct. d. Items ii), iv), and vi) are correct. e. None of these combinations are correct.

10. The Otto cycle model is used with … a. Reciprocating internal combustion engines where the fuel-air mixture is ignited by a spark. b. Reciprocating internal combustion engines where the fuel-air mixture is ignited by high pressures in the cylinders. c. Internal combustion engines with continuous flow of fuel and air (i.e., gas turbine engines). d. External combustion “hot air” engines. e. Vapor compression refrigeration.

11. In an air standard analysis, we pretend that the substance in an engine is pure air, and we analyze this as if energy is put into the air from the outside and, later, waste heat is removed from the air. a. True b. False




12. The Brayton cycle is used to model the operation of … a. Steam Power Plants b. Spark Ignition Internal Combustion Engines c. Compression Ignition Internal Combustion Engines d. Gas Turbine Engines e. Vapor Compression Refrigeration Machines f. None of these

13. For high thermal efficiency, the compression ratio in a spark ignition reciprocating engine is likely to be in the range of … a. 8:1 to 10:1. b. 15:1 to 20:1. c. 20:1 to 40:1. d. None of these are reasonable.

14. For high thermal efficiency, the compression ratio in a compression ignition reciprocating engine is likely to be in the range of … a. 8:1 to 10:1. b. 15:1 to 20:1. c. 20:1 to 40:1. d. None of these are reasonable.

15. The environmental aspects of refrigerants are important considerations in selection. a. True b. False

16. Ammonia may be used as a refrigerant. a. True b. False

17. Carbon Dioxide may be used as a refrigerant. a. True b. False  

Q7. The theory of viscoelasticity is used to describe the behaviour of materials in liquid phase.
a. For each of the models, identify a real life engineering problem where it is applies and describe this.
b. How can the knowledge be used in design applications for the problem you identified above.

c. What are the challenges in the use of the knowledge for solving practical problems.

A 50 cm *50 cm copper slab 6.25 mm thick has uniform temperature of 300℃. Its temperature is suddenly lowered to 36℃. (quenched in water)

Take

The conductivity k=370 W/mK, the density rho=9100 kg/m³, the specific heat c=0.38 kJ/kg℃, the convection coefficient h=90 W/m²℃.

1.      Calculate the surface area, As

2.      Calculate the volume, V.

3.   Calculate the characteristic length, Lc

4.      Calculate the Biot number, Bi

5.      Calculate the thermal diffusivity, α (alpha)

6.      Calculate the constant of time, τ (tau)

7.   Calculate the time required for the plate to reach the temperature of , t₁

8.   Calculate the time required for the plate to reach the temperature of , t2

9.      Calculate the temperature at the surface at time 100 s, Ts2

10.      Calculate the total energy transferred from this plate during the first 100 s, Q

A 15 kW and 1200 r.p.m. motor drives a compressor at 300 r.p.m. through a pair of spur gears having 20° stub teeth. The centre to centre distance between the shafts is 400 mm. The motor pinion is made of forged steel having an allowable static stress as 210 MPa, while the gear is made of cast steel having allowable static stress as 140 MPa. Assuming that the drive operates 8 to 10 hours per day under light shock conditions and face width as 10 times the module, find from the standpoint of strength, 1. Module; 2. Face width; 3. Number of teeth and pitch circle diameter of each gear; 4. Check the gears thus designed from the consideration of wear. The material combination factor for the wear as 1.4 and the flexural endurance limit may be taken as 490 MPa.