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An insulated tank initially contains 0.25 kg of gas with an internal energy of 200 kJ/kg. Additional gas with an internal energy of 300 kJ/kg and an enthalpy of 400 kJ/kg enters the tank until the total mass of gas contained is 1 kg. What is the final internal energy (in kJ/kg) of the gas in the tank?
An insulated tank initially contains 0.25 kg of gas with an internal energy of 200 kJ/kg. Additional gas with an …
Mech_59 Asked on 2nd December 2022 in Mechanical engineering.
- 449 views
- 1 answers
- 2 votes
A closed system undergoes a process 1-2 for which the values of Q1-2 and W1-2 are +20 kJ and +50 kJ, respectively. If the system is returned to state 1, and Q2-1 is -10 kJ, What is the value of the work W2-1?
A closed system undergoes a process 1-2 for which the values of Q1-2 and W1-2 are +20 kJ and +50 …
Mech_59 Asked on 2nd December 2022 in Mechanical engineering.
- 448 views
- 1 answers
- 2 votes
System undergoes a process during which the heat transfer to the system per degree increase in temperature is given by the equation: dQ/dT = 2.0kJ/degree Celsius . What will be the change in internal energy?
System undergoes a process during which the heat transfer to the system per degree increase in temperature is given by …
Mech_59 Asked on 2nd December 2022 in Mechanical engineering.
- 429 views
- 1 answers
- 2 votes
An insulated box containing 0.5 kg of a gas having Cv = 0.98 kJ/kg.K falls from a balloon 4 km above the the earth’s surface. What will be the temperature rise of the gas when the box hits the ground?
An insulated box containing 0.5 kg of a gas having Cv = 0.98 kJ/kg.K falls from a balloon 4 km …
Mech_59 Asked on 2nd December 2022 in Mechanical engineering.
- 460 views
- 1 answers
- 2 votes
In a steady-flow adiabatic turbine, the changes in the internal energy, enthalpy, kinetic energy and potential energy of the working fluid, from inlet to exit, are -100 kJ/kg, -140 kJ/kg, -10 kJ/kg and 0 kJ/kg respectively. What is the amount of work developed by the turbine?
In a steady-flow adiabatic turbine, the changes in the internal energy, enthalpy, kinetic energy and potential energy of the working …
Mech_59 Asked on 2nd December 2022 in Mechanical engineering.
- 390 views
- 1 answers
- 2 votes
Gas contained in a closed system consisting of piston cylinder arrangement is expanded. Work done by the gas during expansion is 50 kJ. Decrease in internal energy of the gas during expansion is 30 kJ. What is the heat transfer during the process?
Gas contained in a closed system consisting of piston cylinder arrangement is expanded. Work done by the gas during expansion …
Mech_59 Asked on 2nd December 2022 in Mechanical engineering.
- 453 views
- 1 answers
- 2 votes
Experimental measurements on a refrigeration system indicate that rate of heat extraction by the evaporator, rate of heat rejection in the condenser and rate of heat rejection by the compressor body to the environment are 70 kW, 90 kW and 5 kW respectively. What is the power input (in kW) required to operate the system?
Experimental measurements on a refrigeration system indicate that rate of heat extraction by the evaporator, rate of heat rejection in …
Mech_59 Asked on 2nd December 2022 in Mechanical engineering.
- 415 views
- 1 answers
- 2 votes
The air with enthalpy of 100 kJ/kg is compressed by an air compressor to a enthalpy of 200 kJ/kg. The loss of heat is 40 kJ/kg from the compressor as the air passes through it. Neglecting kinetic and potential energies, what is the power required for an air mass flow of 0.5 kg/s?
The air with enthalpy of 100 kJ/kg is compressed by an air compressor to a enthalpy of 200 kJ/kg. The …
Mech_59 Asked on 2nd December 2022 in Mechanical engineering.
- 451 views
- 1 answers
- 2 votes
The internal energy of certain system is a function of temperature alone and is given by the formula E = 25 + 0.25t kJ. If this system executes a process for which the work done by it per degree of temperature increase is 0.75 kN-m, what is the heat interaction per degree temperature increase in kJ?
The internal energy of certain system is a function of temperature alone and is given by the formula E = …
Mech_59 Asked on 2nd December 2022 in Mechanical engineering.
- 421 views
- 1 answers
- 2 votes
[Solved]: A 2 kg of steam occupying 0.3 m^3 at 15 bar is expanded according to the law pv^1.3 = constant to a pressure of 1.5 bar . What is the work done during the expansion?
A 2 kg of steam occupying 0.3 m^3 at 15 bar is expanded according to the law pv^1.3 = constant …
Mech_59 Asked on 30th November 2022 in Mechanical engineering.
- 425 views
- 1 answers
- 2 votes

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