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.
A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect ?
Equilibrium constant decreases as the temperature
Which of the following is not an intensive property ?
"At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero". This follows from the
In a working refrigerator, the value of COP is always
Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of performance)?
During Joule-Thomson expansion of gases
The accentric factor of a materical, 'ω', is defined as ω = -log10(Prsat)Tr-1 = 0.where, Prsat = reduced vapor pressure, Tr = reduced temperature. The value of accentric factor is always
For a cyclic process, a fixed ratio between heat and work
The shape of T-S diagram for Carnot Cycle is a
"Dry ice" is
In jet refrigerators, the refrigerating fluid is practically always
Water on heating from 1 to 4°C
__________ increases with increase in pressure.
All gases during throttling process at atmospheric temperature and pressure show a cooling effect except
Measurement of thermodynamic property of temperature is facilitated by __________ law of thermodynamics.
Degress of freedom at triple point will be
Which of the following is not a common refrigerant ?
For an isothermal process, the internal energy of a gas
Which of the following non-flow reversible compression processes require maximum work ?
Pick out the correct statement.
A refrigerator may be termed as a
Compressibility factor for almost all the gases are approximately same at the same
The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containingmole % each of n- heptane and n- octane into pure compounds each at 1 atm is