Chemical Engineering Thermodynamics

271. Joule-Thomson co-efficient is defined as

1. μ = (∂P/∂T)H
2. μ = (∂T/∂P)H
3. μ = (∂E/∂T)H
4. μ = (∂E/∂P)H

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273. Joule-Thomson effect i.e., a throttling process is a constant _________ process.

1. Entropy
2. Temperature
3. Internal energy
4. Enthalpy

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274. Joule-Thomson experiment is

1. Isobaric
2. Adiabatic
3. Isenthalpic
4. Both (B) & (C)

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275. Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to _________ °C.

1. 270
2. 327
3. 300
4. 540

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276. Kopp's rule is used to calculate the heat capacity of

1. Solids
2. Liquids
3. Gases
4. All (A), (B) & (C)

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277. Law of corresponding states says that

1. Two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same
2. The surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature
3. No gas can be liquefied above the critical temperature, howsoever high the pressure may be.
4. The molar heat of energy of gas at constant volume should be nearly constant (about 3 calories)

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278. Lenz's law results from the law of conservation of

1. Mass
2. Momentum
3. Energy
4. None of these

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279. Linde gas liquefaction process employs cooling

1. By throttling
2. By expansion in an engine
3. At constant pressure
4. None of these

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280. Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in

1. Increased COP
2. Same COP
3. Decreased COP
4. Increased or decreased COP; depending upon the type of refrigerant

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