University of TechnologyMechanical EngineeringMid Examination 2020/2021Year: 1" StageSubject: physics 2Examiners: Thermodynamics groupExam Time: 2 Hrs.Date: 22 /6/ 2021Answer four questions onlyQ1:: A- The absolute pressure in water at a depth of 5 m is read to be 145 kPa. Determine theabsolute pressure at a depth of 5 m in a liquid whose density 900 kg/m3 at the same location?B- A 650 MW thermal power plant has an overall efficiency of 43% consumped natural gas fuel(heating value-45 MJ/kg).Calculate the saving in fuel when the fuel type change to gasoil (heatingvalue=50 MJ/kg) in kg/hr.Q2 A perfect gas is contained in a rigid vessel at 2 bar and 315°C is cooled at constant volume topressure of 1 bar ,and then expanded isothermally until the pressure falls to 0.5 bar; the gas hasa molar mass of 26 kg/kmol and value of y=1.37.Calculate the net work and heat transferred perunit mass.Q3: - In a gas turbine installation, the gases enter the turbine at the rate of 5 kg/s with a velocity of50 m/s and enthalpy of 900 kJ/kg and leave the turbine with 150 m/s and enthalpy of 400 kJ/kg. Theloss of heat from the gases to the surroundings is 25 kJ/kg. Assume R = 0.285 kJ/kgK, Cp = 1.004kJ/kgK and inlet conditions to be 100 kPa and 27 C. Determine the diameter of the inlet pipe.Q4 A- Answer false or true and correct:1. When a closed system undergoes a process between two specified states, the change intemperature between the end states is dependent of details of the process.2. If the volume of a given mass of a gas is doubled without changing its temperature the pressureof the gas is Reduced to 1/4of the initial value3. Volume is an intensive property of a thermodynamic system.4. The heating and expanding of a gas is called thermodynamic states.5. An increase in enthalpy leads to an decrease in internal energy.B- The gas in an internal combustion engine initially at temperature of 1400°C expandspolytropically to five times its initial volume and( 1/7) its initial pressure. Calculate1-The index of expansion n.Q5: A-Steam enters a turbine with a velocity of 47 m/s and specific enthalpy 2690 kJ/kg. the steamleaves the turbine with a velocity of 25 m/s and specific enthalpy 1200 kJ/kg. the heat lost tothe surroundings as the steam passes through the turbine is 25 kJ/kg .the steam flow rate is32400kg/h determine the work output from the turbine in kilowatts.B- 0.016 m' gas at a pressure of 3.070 Kpa expands to a pressure of 0.00207 bar according tothe law pV-C .Determine a- the final volume b- the work heat transferred during theexpansion. Take (the molecular weight of the gas =28 and specific heat at constant volume=0.866 kJ/kg .K).

Answered: Image /qna-images/answer/5088c716-c90e-4ada-a61e-446935d9f88a.jpg

Q1::A- The absolute pressure in water at a depth of 5 m is read to be 145 kPa. Determine the absolute pressure at a depth of 5 m in a liquid whose density 900 kg/m3 at the same location? B- A 650 MW thermal power plant has an overall efficiency of 43% consumped natural gas fue

Q1::A- The absolute pressure in water at a depth of 5 m is read to be 145 kPa. Determine the absolute pressure at a depth of 5 m in a liquid whose density 900 kg/m3 at the same location? B- A 650 MW thermal power plant has an overall efficiency of 43% consumped natural gas fue

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Show your complete solution for each problem. Only the final answer in your calculation should be rounded off to two decimal digits. Box your final answer. 1. The increase in the specific internal energy is 33.8 BTU/Ibm in a reciprocating compressor draws 40 lbm/min of air whose density is 0.074 lbm/ft³ and discharge it with a density of 0.311 lbm/ft³. At the suction, the pressure is 18 lb:/in² and discharge 88 lb:/in². If the changed in kinetic energy was neglected, determine the work on the air in horsepower (hp).
An automobile lift in the Karsha car wash and service station raises 5.6 kN car of 2.4 m above the floor level from the ground,As shown in the below given figure , If a hydraulic cylinder has a piston of diameter 234.5 cm . Find the following: (a) Necessary Work to lift the car vehicle (in J) (b) Required Pressure to lift the car.in pascal (c) Power needed to the raise the car in 0.8 minutes in kW
Convert the values provided below in terms of specified units.
Solve fast
The Louisiana Superdome has an interior volume of 125 million ft3, covered by a 440,000 ft² roof. On a particular day, the interior air pressure gave a manometer reading of 19 inches mercury (pHg = 13.6 g/cm³). Local atmospheric pressure is 102 kPa. 1. kg Calculate the mass of the air inside, assuming an average temperature of 20 °C. 2. kN Calculate the net force applied to the roof by the interior/exterior air (do not account for the weight of the roof). Assume the roof is flat.
Air contained in a piston-cylinder system undergoes a polytropic process. Pv1.3 = constant P1 = 100 kPa pressure and T1 = 220C temperature to P2 = 500 kPa pressure is compressed. Calculate the specific volume and temperature at the end of the process.
Please answer fast What is the total pressure of a system that is at 500°F and whose specific internal energy is 1174.4 BTU/lbm?
1. A certain ideal gas X has molecular weight of 10 g/mol and specific heat ratio of 2. Initially, X has pressure of 200kPa and volume of 2m3. The pressure was doubled during heat transfer. Find the heat transfer if it underwent a process described by ( a. n=infinity b. n=Cp/Cv C. n=3
QUESTION 2 Consider a quantity of 2.0 kg of refrigerant R-134a. The refrigerant fills a 9.9 ft weighted piston/cylinder apparatus that is at a constant pressure of 29 psi. The system is then heated until it reaches a temperature of 86 °F. a.) What is the initial temperature of the refrigerant? b.) What is the final volume of the refrigerant? Note: Refer to property tables in appendix 1 of textbook Attach File Browse Local Files
1. How can recognize an extensive or intensive properties such as density, colour of gold, Volume of water in a graduated cylinder. 2. Drive the relation 1-x = Vavg me 3. A glycerin pump is powered by a 5-kW electric motor. The pressure differential between the outlet and the inlet of the pump at full load is measured to be 211 kPa. If the flow rate through the pump is 18 L/s and the changes in elevation and the flow velocity across the pump are negligible, the overall efficiency of the pump is (a) 69 percent (b) 72 percent (c) 76 percent (d) 79 percent (e) 82 percent.
3. Please calculate the annual electricity production of a wind farm with 20 turbines. The annual mean wind speed is 7 m/s and diameter of the blades is 20 m. If we assume power consumption of a person is 3,000 kWh, about how many people will this energy support? Annual electricity production (KWh) = K Vm³ At T Where: - - - K = 3.2 (factor based on turbine performance) Vm= annual mean wind speed (m/s) At = swept area of turbine (m2) T = number of turbines Suitable for medium- to large-scale wind turbines (> 200 m2 swept area)
Plz Solve