Even Carnot engine cannot give 100% efficiency, because we cannot

A Carnot engine, having an efficiency of 1/10 as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is

A diatomic ideal gas is used in a Carnot engine as the working substance. If during the adiabatic expansion part of the cycle the volume of the gas increased from V to 32 V, the efficiency of the engine is

A thermodynamic process is shown in the figure. The pressure and volumes corresponding to some points in the figure are

P_A = 3 × 10⁴ Pa,  V_A = 2 × 10^-3 m³

P_B = 8 × 10⁴ Pa, V_B = 5 × 10^-3 m³

In process AB, 600 J of heat is added to the system and in process BC, 200 J of heat is added to the system. The change in internal energy of the system in process AC would be

The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is

                         

When a system is taken from the initial state i to final state f along he path iaf, it is found that Q = 50 cal and W = 20 cal. If along the path ibf, Q = 36 cal, then W along the path ibf is

                      

Which of the following statement is correct for any thermodynamic system ?

Which of the following is not a  thermodynamic coordinate?

One mole of an ideal gas at an initial temperature of T K does 6R joules of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is 5/3, the final temperature of gas will be

An ideal gas initially at P₁, V₁ is expanded to P₂, V₂ and then compressed adiabatically to the same volume V₁ and pressure P₃. If W is the net work done by the gas in complete process, which of the following is true ?