Related Questions

The temperature at which a gas, when subjected to Joule-Thomson expansion, neither cools or heats up, is termed as the __________ temperature. Above this temperature the gas heats up on throttling and below this the gas cools down.
A Isotactic
B Saturation
C Inversion
D Throttling
In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be
A High, of the order of 25°
B As low as possible (3 to 11°C)
C Zero
D Any value
After throttling, gas temperature
A Decreases
B Increases
C Remains same
D May increase or decrease ; depends on the nature of the gas
The heat transfer co-efficient in film type condensation is __________ that for dropwise condensation.
A Greater than
B Lower than
C Is same as
D Half
All gases above its inversion temperature, in a throttling process will show
A A heating effect
B No change in temperature
C A cooling effect
D Either A or C
All gases during throttling process at atmospheric temperature and pressure show a cooling effect except
A CO2
B H2
C O2
D N2
All gases except __________ shows a cooling effect during throttling process at atmospheric temperature and pressure.
A Oxygen
B Nitrogen
C Air
D Hydrogen
The saturation line is the line up to which banks get saturated after the canal runs for some time. The saturation gradient in ordinary loam soil, is generally
A 2 : 1
B 3 : 1
C 4 : 1
D 5 : 1
The value of Joule-Thomson co-efficient, in case where cooling occurs after the throttling process is
A 0
B ∞
C +ve
D -ve
The throttling process is __________ process.
A Reversible
B Irreversible
C Reversible or irreversible
D None of these

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