Chemical Engineering Thermodynamics

291. Near their critical temperatures, all gases occupy volumes _________ that of the ideal gas.

1. Less than
2. Same as
3. More than
4. Half

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292. No work is done by the system, when a reaction occurs at constant

1. Volume
2. Temperature
3. Pressure
4. None of these

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293. Normal temperature and pressure (N.T.P.) corresponds to

1. 0°C and 760 mm Hg
2. 15°C and 760 mm Hg
3. 20°C and 760 mm Hg
4. 0°C and 1 kgf/cm2

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294. Number of components (C), phase (P) and degrees of freedom (F) are related by Gibbs phase rule as

1. P + F - C = 2
2. C = P - F + 2
3. F = C - P - 2
4. P = F - C - 2

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295. Number of degrees of freedom for a three phase system in equilibrium comprising of three non-reacting chemical species is

1. 2
2. 0
3. 1
4. 3

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296. Number of phases in a colloidal system is:

1. 1
2. 2
3. 3
4. 4

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297. On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line (∂P/∂V)_T are related as (where, y = C_p/C_v)

1. (∂P/∂V)S = (∂P/∂V)T
2. (∂P/∂V)S = [(∂P/∂V)T]Y
3. (∂P/∂V)S = y(∂P/∂V)T
4. (∂P/∂V)S = 1/y(∂P/∂V)T

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298. On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will

1. Increase
2. Decrease
3. Remain same
4. Increase in summer and will decrease in winter

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299. One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is

1. 30554
2. 10373
3. 4988.4
4. 4364.9

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300. One ton of refrigeration capacity is equivalent to the heat removal rate of

1. 50 kcal/hr
2. 200 BTU/hr
3. 200 BTU/minute
4. 200 BTU/day

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