Q. No.The temperature-entropy diagram of a reversible engine cycle is given in the figure. Its efficiency is
1. 1/3
2. 2/3
3. 1/2
4. 1/4
A cyclic process ABCA is shown in the V-T diagram. Process on the P-V diagram is -
(1)
(2)
(3)
(4)
The heat energy absorbed by a system is going through a cyclic process shown in the figure is:
(1) 107 J
(2) 104 J
(3) 102 J
(4) 10–3 J
A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown in the PV diagram. The net work done during the complete cycle is given by the area
(1) P1ACBP2P1
(2) ACBB'A'A
(3) ACBDA
(4) ADBB'A'A
In the diagrams (i) to (iv) , variation of volume with changing pressure is shown. A gas is taken along the path ABCDA. The change in internal energy of the gas will be
(1) Positive in all cases (i) to (iv)
(2) Positive in cases (i), (ii) and (iii) but zero in (iv) case
(3) Negative in cases (i), (ii) and (iii) but zero in (iv) case
(4) Zero in all four cases
The P-V graph of an ideal gas cycle is shown here as below. The adiabatic process is described by
(1) AB and BC
(2) AB and CD
(3) BC and DA
(4) BC and CD
An ideal monoatomic gas is taken round the cycle as shown in following P-V diagram. The work done during the cycle is -
(1) PV
(2) 2 PV
(3) 4 PV
(4) Zero
A system changes from the state (P1, V1) to (P2, V2) as shown in the figure. What is the work done by the system ?
(1) 7.5 × 105 joule
(2) 7.5 × 105 erg
(3) 12 × 105 joule
(4) 6 × 105 joule
Carbon monoxide is carried around a closed cycle \(abc\) in which \(bc\) is an isothermal process as shown in the figure. The gas absorbs \(7000 ~\text J\) of heat as its temperature increases from \(300 ~\text K\) to \(1000 ~\text K\) in going from \(a\) to \(b.\) The quantity of heat rejected by the gas during the process \(ca\) is:
1. \(4200~\text J\)
2. \(5000~\text J\)
3. \(9000~\text J\)
4. \(9800~\text J\)
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