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Thermodynamics ...

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  • Question 1
    4 / -1

    A Carnot engine whose low temperature reservoir is at 7°C has an efficiency of 50%. It is desired to increase the efficiency to 70%. By how many degrees should the temperature of the high temperature reservoir be increased

  • Question 2
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    P-V diagram of a diatomic gas is a straight line passing through origin. The molar heat capacity of the gas in the process will be

  • Question 3
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    Following figure shows an adiabatic cylindrical container of volume Vo divided by an adiabatic smooth piston (area of cross-section = A) in two equal parts. An ideal gas (Cp/Cv = γ) is at pressure P1and temperature T1 in left part and gas at pressure P2 and temperature T2 in right part. The piston is slowly displaced and released at a position where it can stay in equilibrium. The final pressure of the two parts will be (Suppose x Displacement of the piston)

  • Question 4
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    Two moles of ideal helium gas are in a rubber balloon at 30°C . The balloon is fully expandable and can be assumed to require no energy in its expansion. The temperature of the gas in the balloon is slowly changed to 35°C . The amount of heat required in raising the temperature is nearly (Take R = 8.31 J/mol-K)

  • Question 5
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    A system goes from A to B via two processes I and II as shown in figure. If ∆U1 and ∆U2 are the changes in internal energies in the processes I and II respectively, then

  • Question 6
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    A thermodynamic system is taken through the cycle PQRSP process. The net work done by the system is

  • Question 7
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    A graph of pressure versus volume for an ideal gas for different processes is as shown. In the graph curve OC represents

  • Question 8
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    The P-V diagram shows seven curved paths (connected by vertical paths) that can he followed by a gas. Which two of them should be parts of a closed cycle if the network done by the gas is to be at its maximum value?

  • Question 9
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    An ideal gas of mass m in a state A goes to another state B via three different processes as shown in figure. If Q1, Q2 and Q3 denote the heat absorbed by the gas along the three paths, then

  • Question 10
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    Which of the following graphs correctly represents the variation of β = –(dV/dP)/V with P for an ideal gas at constant temperature?

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