A reversible engine and an irreversible engine are working between the same temperatures. The efficiency of the ...........
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(b)
Efficiency of reversible engine is greater, because there is no loss of heat.
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Three samples of the same gas $A, B$ and $C(\gamma = 3/2)$ have initially equal volume. Now the volume of each sample is doubled. The process is adiabatic for $A$ isobaric for $B $ and isothermal for $C$. If the final pressures are equal for all three samples, the ratio of their initial pressures are
The $P-V$ diagram shows seven curved paths (connected by vertical paths) that can be followed by a gas. Which two of them should be parts of a closed cycle if the net work done by the gas is to be at its maximum value
For a thermodynamic process $\delta Q = -50$ $calorie$ and $W = -20$ $calorie$ . If the initial internal energy is $-30$ $calorie$ then final internal energy will be ....... $calorie$
Two kg of water is converted into steam by boiling at atmospheric pressure. The volume changes from $2 \times {10^{ - 3}}\,{m^3}$ to $3.34{m^3}.$ The work done by the system is about ....... $kJ$
An engineer claims to have made an engine delivering $10 kW$ power with fuel consumption of $1 g/sec$. The calorific value of the fuel is $2 kcal/g$. Is the claim of the engineer
An ideal gas in a cylinder is separated by a piston in such a way that the entropy of one part is $S_{1}$ and that of the other part is $S_{2}$. Given that $S _{1}> S _{2}$. If the piston is removed then the total entropy of the system will be :
In a thermodynamic process pressure of a fixed mass of a gas is changed in such a manner that the gas releases $20 \,J$ of heat when $8 \,J$ of work was done on the gas. If the initial internal energy of the gas was $30 \,J$, then the final internal energy will be ........ $J$
This question has Statement $1$ and Statement $2.$ Of the four choices given after the Statements, choose the one that best describes the two Statements.
Statement $1:$ In an adiabatic process, change in internal energy of a gas is equal to work done on/by the gas in the process.
Statement $2 :$ The temperature of a gas remains constant in an adiabatic process.