+1-315-636-4485
+91 98151-74050 
This is an MCQ-based quiz on the topic of Available Energy, Availability and Irreversibility.
This includes the following:-
Available Energy Referred to a Cycle
Quality of Energy
Maximum Work in a Reversible Process
Boundary Work in a Multistep Process
Work in a Reversible Process
Useful Work
Availability
Irreversibility and Gouy-Stondola Theorem
Availability or Exergy Balance
Second Law Efficiency
Comments on Exergy
The complete conversion of heat into shaft-work is impossible.
For an infinitesimal reversible process at constant pressure,
When a gas is throttled adiabatically from a high to a low pressure,
The enthalpy remains same
There is degradation of energy
Both of the mentioned
None of the mentioned
The available energy of a system ___ as its temperature or pressure decreases and approaches that of the surroundings.
Increases
Decreases
Remains constant
None of the mentioned
The exergy of a fluid at a higher temperature is ___ than that at a lower temperature and ___ as the temperature decreases.
Less, increases
More, increases
More, decreases
Less, decreases
When considering a finite energy source, its working fluid expands,
Reversibly
Adiabatically
Reversibly and adiabatically
None of the mentioned
Energy is said to be degraded each time it flows through a finite temperature difference.
True
False
Exergy is lost due to
Irreversible heat transfer
Through finite temperature difference
During the process of heat addition
All of the mentioned
Whenever heat is transferred through a finite temperature difference, there is always a decrease in the availability of energy so transferred.
True
False
The available energy is known as ____ and the unavailable energy is known as ____
Energy, exergy
Exergy, energy
Both are called exergy
Both are called energy
The lowest practicable temperature of heat rejected is the
Given temperature
0K
Temperature of surroundings
273K
The unavailable energy is the product of the lowest temperature of heat rejection and the change of entropy of system during the process of supplying heat.
True
False
The ____ obtainable from a certain heat input in a cyclic heat engine is called ____
Minimum work output, available energy
Maximum work output, available energy
Minimum work input, unavailable energy
None of the mentioned
Which of the following is a type of energy?
High grade energy
Low grade energy
Both of the mentioned
None of the mentioned
Which of the following is an example of high grade energy?
Mechanical work
Electrical energy
Water power and wind power
All of the mentioned
