An ideal monoatomic gas is taken around the cycle ABCDA as shown in the PV diagram. The work done during the cycle is given by:
1/2 PV
PV
2 PV
4 PV
Which one is correct ?
In an isobaric process, ΔP = 0
In an isochoric process, ΔW = 0
In an isothermal process, ΔT = 0
In an isothermal process, ΔQ = 0
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
Which of the following parameters does not characterize the thermodynamic state of matter ?
Temperature
Pressure
Work
Volume
One mole of a monoatomic gas is heated at a constant pressure of 1 atmosphere from 0 K to 100 K. If the gas constant R = 8.32J/mol K, the change in internal energy of the gas is approximately:
2.3 J
46 J
8.67 x 103 J
1.25 x 103 J
In an adiabatic process, the quantity which remains constant is
Total heat of the system
In an adiabatic system which is true ?
PγTγ -1 = constant
PγT1-γ = constant
PTγ = constant
P1-γTγ = constant
A system goes from A to B via two processes I and II as shown in the figure. If ΔU1 and ΔU2are the changes in internal energies in the processes I and II respectively, then:
ΔU1 = ΔU2
ΔU1 > ΔU2
Δ U1 < ΔU2
Relation between ΔU1 and ΔU2 cannot be determined.
A scientist says that the efficiency of his heat engine which works at source temperature of 127oC and sink temperature 27oC is 26%.
It is impossible
It is possible but less probable
It is quite possible
Data is incomplete
The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is:
1/3
1/2
2/3
1/4
