Thermodynamics - GATE practice papers - Mechanical for Q. 372
Q. In which condition does the internal energy of the system increase? (Marks: 02)- Published on 19 Oct 15a. when the heat transfer into the system is less than the work transfer out of the system
b. when the heat transfer into the system is more than the work transfer out of the system
c. when the heat transfer into the system is equal to the work transfer out of the system
d. none of the above
ANSWER: when the heat transfer into the system is more than the work transfer out of the system
When a system undergoes a change of state along with the heat transfer as well as work transfer, the net energy transfer is collected and stored within the system. When heat transfer within the system Q is more than the work transfer out of the system W, then the change in energy (Q – W) is stored in the system. This is the internal energy and it increases.
