An engine has an efficiency of ¹/6. When the temperature of sink is reduced by 62^oC, its efficiency is doubled. Temperature of the source is

A scientist says that the efficiency of his heat engine which works at source temperature of 127^oC and sink temperature 27^oC is 26%.

A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increased so as to increase its efficiency by 50% of original efficiency?

The equation of state for 5g of oxygen at a pressure p and temperature T, when occupying a volume V, will be

An ideal gas is compressed adiabatically to ⁸/27 times of its present value at 27^oC. The temperature of the gas becomes (γ= 5/3).

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

Which statement is incorrect ?

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

                      

A mono atomic ideal gas, initially at temperature T₁ is enclosed in a cylinder fitted with a friction-less piston. The gas is allowed to expand adiabatically to a temperature T₂ by releasing the piston suddenly. L₁ and L₂ are the lengths of the gas column before and after expansion respectively, then T₁/T₂ is given by

The molar specific heat at constant pressure of an ideal gas is (⁷/2)R. The ratio of specific heat at constant pressure to that at constant volume is