Questions Archive - Page 9 of 38 - Aerospace answers

All Questions

All Questions

Filter by

Questions Per Page:

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.
- 456 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.
- 385 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.
- 448 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.
- 410 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.
- 447 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.
- 415 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.
- 421 views
- 1 answers
- 2 votes
[Solved]: A frictionless piston cylinder device contains 5 kg of steam at 400 kPa and 200 degree Celsius . The heat is now transferred to the steam until the temperature reaches 250 degree Celsius. If the piston is not attached to a shaft, its mass is constant, and by taking the values of specific volume v1 as 0.53434 m^3/kg and v2 as 0.59520 m^3//kg, what is the work done by the steam during the process?
A frictionless piston cylinder device contains 5 kg of steam at 400 kPa and 200 degree Celsius . The heat …
Mech_59 Asked on 30th November 2022 in Mechanical engineering.
- 453 views
- 1 answers
- 2 votes
A steel tank placed in hot environment contains 5 kg of air at 4 atm at 30 degree Celsius. A portion of the air is released till the pressure becomes 2 atm. Later, the temperature of the air in the tank is found to be 150 degree Celsius. What is the quantity of air allowed to escape?
A steel tank placed in hot environment contains 5 kg of air at 4 atm at 30 degree Celsius. A …
Mech_59 Asked on 30th November 2022 in Mechanical engineering.
- 447 views
- 1 answers
- 2 votes
[Solved]: When the valve of an evacuated bottle is opened, the atmospheric air rushes into it. If the atmospheric pressure is 101.325 kPa and 0.6 m^3 of air enters into the bottle, then what is the work done by the air?
When the valve of an evacuated bottle is opened, the atmospheric air rushes into it. If the atmospheric pressure is …
Mech_59 Asked on 30th November 2022 in Mechanical engineering.
- 467 views
- 1 answers
- 2 votes

<
1
…
8
9
10
…
38
>