All Processes on PV Diagram

Q.

What is 1st and 2nd moment of area?

Q. A fluid undergoes a reversible adiabatic compression from 0.5 MPa, 0.2 m${}^3$ to 0.05 m${}^3$ according to the law PV${}^{1.3}$ = constant. The change in internal energy during the process is _______ kJ .

1. $120,\text{kJ}$
2. $171.9,\text{kJ}$
3. $571.7,\text{kJ}$
4. $271.9,\text{kJ}$

Q. A gas expands from an initial state where the pressure is 340 kPa and volume is 0.0425 m${}^3$ to a final pressure of 136 kPa. The relationship between the pressure and volume is $P{V}^2$ = constant. The work done for the process is________kJ.

1. $3.21,\text{kJ}$
2. $7.5,\text{kJ}$
3. $5.31,\text{kJ}$
4. $24,\text{kJ}$

Q. The heat interaction by a system in going through the cyclic process is________J.

1. $32.416J$
2. $31.415J$
3. $27.321J$
4. $30.50J$

Q.

In an adiabatic process, pressure is increased by 2/3%. If nu = 3/2 then the volume in the process is decreased by about.

Q.

A gas expands from $5\mathrm{liter}$ to $105\mathrm{liter}$ at a constant pressure $100N{m}^{-2}$. The work done is

1. $1\mathrm{joule}$

2. $4\mathrm{joule}$

3. $8\mathrm{joule}$

4. $10\mathrm{joule}$

Q. The given figure shows the variation of force (Newton) in an elementary system which undergoes a process during which the position of the plunger changes from 0 to 5 $m$ . if the change in internal energy of the system during the process is $2.5J$, the heat absorbed during the process is_____ $KJ$.

1. 0.03
2. 0.3
3. 3.0
4. 3

Q. A balloon of 20 cm diameter is filled with air at 1.2 bar and ${25}^{\circ }C$ It is heated to ${700}^{\circ }C$ and as a result its diameter increases to 25 cm. The variation of pressure Vs diameter during heating is shown below, rising to a maximum value of 1.5 bar. The heat transferred to the balloon if the energy change of air $\Delta E$ is given by $\Delta E=3\Delta T$ Joule, where $\Delta T$ is the change in temperature in kelvin is _____ J

1. 2568 J
2. 2400J
3. 255J
4. 2453J

Q. A cyclic process in a P-V diagram represents an ellipse as shown in fig. The network done is _______ kJ

1. $13.62,\text{kJ}$
2. $23.562,\text{kJ}$
3. $27.562,\text{kJ}$
4. $63.2,\text{kJ}$