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WorksheetsSECOND LAW
Total questions: 10
Worksheet time: 10mins
According to Kelvin-Planck's statement of second law of thermodynamics,
it is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
it is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
it is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body
none of the above
Which is the incorrect statement about Carnot cycle?
It is used as the alternate standard of comparison of all heat engines.
All the heat engines are based on Carnot cycle.
It provides concept of maximising work output between the two temperature limits.
all of the above
The area under the temperature-entropy curve (T - s curve) of any thermodynamic process represents
heat absorbed.
heat rejected
either (a) or (b)
none of these
Which of the following is the correct statement of the second law of thermodynamics?
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.
It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source
There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy.
all of the above
The efficiency of Carnot cycle depends upon
temperature limits
pressure ratio
volume compression ratio
cut-off ratio and compression ratio
The gas turbine cycle with regenerator improves
thermal efficiency
work ratio
avoids pollution
none of these
A reversed heat engine
receives heat from a low temperature region
gives heat to a high temperature region
receives a net inflow of work
all of the mentioned
For a heat pump, coefficient of performance is given by (Q1 is the heat taken from low temperature region and Q2 is the heat given to high temperature region)
Q1/(Q1-Q2)
Q2/(Q1-Q2)
1- (Q1/Q2)
1- (Q2/Q1)
For the same T1 and T2, COP increases with ____ in temperature difference.
increase
decrease
no change
none of the mentioned
In absorption system, compressor in vapour compression cycle is replaced by absorber-generator assembly.
true
false
