In jet refrigerators, the refrigerating fluid is practically always water ammoni

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Question
In jet refrigerators, the refrigerating fluid is practically always
Options
A. water
B. ammonia
C. freon
D. brine

Correct Answer

water

Chemical Engineering Thermodynamics problems

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1. The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same.
Options
A. kinematic viscosity
B. work
C. temperature
D. none of these

2. The expression, , gives the free energy change
Options
A. with pressure changes at constant temperature.
B. under reversible isothermal volume change.
C. during heating of an ideal gas.
D. during cooling of an ideal gas.

6. For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.
Options
A. decreases
B. increases
C. remains same
D. decreases linearly

9. "At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero". This follows from the
Options
A. third law of thermodynamics
B. second law of thermodynamics
C. Nernst heat theorem
D. Maxwell's relations

10. Boyle's law for gases states that
Options
A. , when temperature is constant.
B. , when temperature & mass of the gas remain constant.
C. P ? V, at constant temperature & mass of the gas.
D. = constant, for any gas.

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