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प्रश्न
Explain graphically (i) positive work with varying pressure, (ii) negative work with varying pressure, and (iii) positive work at constant pressure.
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उत्तर
- p-V diagram showing positive work with varying pressure:
- p-V diagram showing negative work with varying pressure:
- p-V diagram showing positive work at constant pressure:
संबंधित प्रश्न
Give an example of some familiar process in which heat is added to an object, without changing its temperature.
Answer in brief.
Why should a Carnot cycle have two isothermal two adiabatic processes?
An ideal gas is taken through an isothermal process. If it does 2000 J of work on its environment, how much heat is added to it?
Heating a gas in a constant volume container is an example of which process?
Draw a p-V diagram of the irreversible process.
State the assumptions made for thermodynamic processes.
Write a note on free expansion.
Explain work done during a thermodynamic process.
Explain thermodynamics of the adiabatic process.
Give the equation of state for an isothermal process.
Give an expression for work done in an isothermal process.
Apply first law for an isothermal process.
Draw the PV diagram for the isothermal process.
Draw the PV diagram for the isobaric process.
Draw the PV diagram for the isochoric process.
Can the given heat energy be completely converted to work in a cyclic process? If not, when can the heat can completely converted to work?
Derive the work done in an adiabatic process.
Explain the isobaric process and derive the work done in this process.
What are the limitations of the first law of thermodynamics?
In a petrol engine, (internal combustion engine) air at atmospheric pressure and temperature of 20°C is compressed in the cylinder by the piston to `1/8` of its original volume. Calculate the temperature of the compressed air. (For air γ = 1.4)
An ideal gas is taken in a cyclic process as shown in the figure. Calculate
- work done by the gas
- work done on the gas
- Net work done in the process
For a given ideal gas 6 × 105 J heat energy is supplied and the volume of gas is increased from 4 m3 to 6 m3 at atmospheric pressure. Calculate
- the work done by the gas
- change in internal energy of the gas
- graph this process in PV and TV diagram
A monoatomic gas of pressure p having volume V expands isothermally to a volume 2V and then adiabatically to a volume 16V. The final pressure of the gas is ____________.
`("ratio of specific heats" = 5/3)`
One mole of an ideal gas with `gamma` = 1.4 is adiabatically compressed so that its temperature rises from 27° C to 47° C. The change in the internal energy of the gas is (R = 8.3 J/mol.K) ____________.
In an isothermal process, the volume of an ideal gas is halved. One can say that ____________.
Consider P-V diagram for an ideal gas shown in figure.
Out of the following diagrams (figure), which represents the T-P diagram?
 (i) |
 (ii) |
 (iii) |
 (iv) |
In a certain thermodynamical process, the pressure of a gas depends on its volume as kV3. The work done when the temperature changes from 100°C to 300°C will be ______ nR, where n denotes number of moles of a gas.
In a cyclic process, if ΔU = internal energy, W = work done, Q = Heat supplied then ______.
