In April 2025
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Compute the mass of a 2 m3 propane at 280 kpa and 40˚C.
m = ____ kg
Find the enthalpy of Helium if its internal energy is 200 KJ/kg
h = _____ kJ/kg
Find the work possess for a Helium gas at 200C.
Work = ____ kJ/kg
An air bubble from the bottom of a lake becomes triple itself as it reaches on the water surface. How deep is the lake?
Depth = _____ meters
The temperature of an ideal gas remains constant while the absolute pressure changes from 100 kPa to 800 kPa. If initial volume is 100 liters, what is the final volume?
V2 = _____ Liters
A state function of the system which describe together the internal energy and the work done is calledA.enthalpyB.internal energyC. workD free energy
rejects 95 kJ of heat at constant pressure and 18 kJ of work is done on it. The system is brought
to original state by adiabatic process. Determine :
(i) The adiabatic work ;
(ii) The values of internal energy at all end states if initial value is 105 kJ.
. A 15 cm diameter vertical cylinder, closed by a piston contains a combustible mixture at a temperature of 30°C. The piston is free to move and its weight is such that the
mixture pressure is 3 bar. Upper surface of the piston is exposed to the atmosphere. The mixture
is ignited. As the reaction proceeds, the piston moves slowly upwards and heat transfer to the
surroundings takes place. When the reaction is complete and the contents have been reduced to
the initial temperature of 30°C, it is found that the piston has moved upwards a distance of
8.5 cm and the magnitude of heat transfer is 4 kJ. Evaluate :
(i) The work ;
(ii) Decrease in internal energy of the system
7. A cylinder contains 0.45 m3 of a gas at 1 × 105 N/m2 and 80°C. The gas
is compressed to a volume of 0.13 m3, the final pressure being 5 × 105 N/m2. Determine :
(i) The mass of gas ;
(ii) The value of index ‘n’ for compression ;
(iii) The increase in internal energy of the gas ;
(iv) The heat received or rejected by the gas during compression.
Take γ = 1.4, R = 294.2 J/kg°C
Air at 1.02 bar, 22°C, initially occupying a cylinder volume of 0.015 m3, is
compressed reversibly and adiabatically by a piston to a pressure of 6.8 bar. Calculate :
(i) The final temperature ;
(ii) The final volume ;
(iii) The work done.
