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Mech_59
A fluid flowing along a pipe line undergoes a throttling process from 10 bar to 1 bar is passing through a partially open valve. Before throttling, the specific volume of the fluid is 0.5 m^3/kg and after throttling is 2.0 m^3/kg. What is the change in specific internal energy during the throttling process?
on 2nd December 2022 in
Mechanical engineering.
155
1
2
Mech_59
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?
on 2nd December 2022 in
Mechanical engineering.
132
1
2
Mech_59
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?
on 2nd December 2022 in
Mechanical engineering.
130
1
2
Mech_59
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?
on 2nd December 2022 in
Mechanical engineering.
120
1
2
Mech_59
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?
on 2nd December 2022 in
Mechanical engineering.
122
1
2
Mech_59
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?
on 2nd December 2022 in
Mechanical engineering.
106
1
2
Mech_59
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?
on 2nd December 2022 in
Mechanical engineering.
120
1
2
Mech_59
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?
on 2nd December 2022 in
Mechanical engineering.
112
1
2
Mech_59
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?
on 2nd December 2022 in
Mechanical engineering.
113
1
2
Mech_59
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?
on 2nd December 2022 in
Mechanical engineering.
109
1
2
1
2
3
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