2 ChE Thermo

Heat is added at constant temperature in an ideal __________ cycle.

• Stirling
• Brayton
• Rankine
• none of these

Pick out the correct equation relating 'F' and 'A'.

• F = A + PV
• F = E + A
• F = A - TS
• F = A + TS

In a reversible process

• Tds = dE + dW
• dE - dW = Tds
• dW - dE = Tds
• Tds - dW + dE >0

Cv for an ideal gas

• does not depend upon temperature.
• is independent of pressure only.
• is independent of volume only.
• is independent of both pressure and volume.

In a homogeneous solution, the activity co-efficient of a component depends upon the

• pressure
• composition
• temperature
• all of these

Pick out the wrong statement:

• The expansion of a gas in vacuum is an irreversible process.
• An isometric process is a constant pressure process.
• Entropy change for a reversible adiabatic process is zero.
• Free energy change for a spontaneous process is negative.

With increase in compression ratio, the efficiency of the otto engine

• increases
• decreases
• remains constant
• increases linearly

The chemical potential of any constituent of an ideal solution depends on the __________ of the solution.

• temperature
• pressure
• composition
• all of these

Fugacity and pressure are numerically equal, when the gas is

• in standard state
• at high pressure
• at low temperature
• in ideal state

Refrigerants commonly used for domestic refrigerators are

• ethyl chloride or methyle chloride
• freon-12
• propane
• NH3 or CO2.