In an adiabatic system which is true ?
PγTγ-1 = constant
PγT1-γ = constant
PTγ = constant
P1-γTγ = constant
An ideal gas is compressed adiabatically to 8/27 times of its present value at 27oC. The temperature of the gas becomes: (γ= 5/3).
475oC
275oC
402oC
175oC
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:
6 cal
16 cal
66 cal
14 cal
A Carnot engine operating between temperatures T1 and T2 has efficiency 1/6. When T2 is lowered by 62 K, its efficiency increases to 1/3. Then T1 and T2 are, respectivley :
372 K and 310 K
372 K and 330 K
330 K and 268 K
310 K and 248 K
An ideal gas undergoing adiabatic change haswhich of the following pressure-temperature relationship ?
pγ-1Tγ = constant
pγTγ-1 = constant
pγT1-γ = constant
p1-γTγ = constant
The PT diagram for an ideal gas is shown in the figure, where AC is an adiabatic process. Find the corresponding PV diagram ?
Which statement is incorrect ?
All reversible cycles have same efficiency.
Reversible cycle has more efficiency than an irreversible one.
Carnot cycle is a reversible one.
Carnot cycle has the maximum efficiency of all the cycles.
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:
(T + 2.4)K
(T - 2.4)K
(T + 4)K
(T - 4)K
100 g of water is heated from 30oC to 50oC. Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4184 J/kg/K)
4.2 kJ
8.4 kJ
84 kJ
2.1 kJ
A Carnot engine, having an efficiency of 1/10 as a 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:
1 J
90 J
99 J
100 J
