First law of thermodynamics___________________?

First law of thermodynamics___________________?

A. enables to determine change in internal energy of the system
B. does not help to predict whether the system will or not undergo a change
C. does not enable to determine change in entropy
D. provides relationship between heat, work and internal energy
E. all of the above

If a system after undergoing a series of processes, returns to the initial state then__________________?

If a system after undergoing a series of processes, returns to the initial state then__________________?

A. process is thermodynamically in equilibrium
B. process is executed in closed system cycle
C. its entropy will change due to irreversibility
D. sum of heat and work transfer will be zero
E. no work will be done by the system

A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227° C and 27° C. His claim is__________________?

A manufacturer claims to have a heat engine capable of develog 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227° C and 27° C. His claim is__________________?

A. justified
B. not possible
C. may be possible with lot of sophistications
D. cost will be very high
E. theroretically possible