engineering recuitment BEL Probationary Engineers Mock Test 2025 Thermodynamics First Law of Thermodynamics
Gas contained in a closed system consisting of piston-cylinder arrangement is expanded work done by the gas during expansion is 50 kJ. The decrease in internal energy of the gas during expansion is 30 kJ. Heat transfer during the process is equal to
1
-20 kJ
2
+20 kJ
3
-80 kJ
4
+80 kJ