For a polytropic process pvn=constant, change is entropy is given by the expression
R loge
R loge
R loge
cv
For a fixed quantity of heat added to a system under specific conditions, the entropy change will be maximum in case of
Isentropic process
Isobaric process
Isothermal process
Isochoric process
All of the following statements are correct, except
Entropy is a measure of the level of irreversibility associated with a process
During a reversible process the total entropy of the interacting bodies remains constant
Entropy of the universe is continuously decreasing
Entropy is a property like pressure, temperature, volume and so on and as such it is a point function
Choose the incorrect statement
Calculations can be made for the entropy change and not for the absolute value of entropy
The freezing of water is accompanied by an increase in entropy
The amount of heat transfer is represented by the area under a reversible process on a temperature-entropy diagram
The units is SI system for the specific entropy are kJ/kg K
In statistical thermodynamics, entropy is defined as
Reversible heat transfer
Measure of reversibility of a system
Degree of randomness
A universal property
Energy tends ever to gravitate to a lower degree of intensity so long as it undergoes no transformation. This statement is related to ………..of thermodynamics
Zeroth law
1st law
2nd law
3rd law
Second law of thermodynamics defines
Entropy
Enthalpy
Efficiency
Internal energy
Zeroth law: temperature:: second law________
Efficiency
Entropy
Internal energy
Entropy
Consider the following statements in an irreversible process
entropy always increases
the sum of the entropy of all bodies taking part in a process always increases
once created, entropy can not be destroyed
identify the correct statements using the codes given below
1 and 2
1 and 3
2 and 3
1, 2 and 3
A perfect gas enclosed in a piston-cylinder arrangement executes a reversible a diabatic expansion process. Consider the following statements
1. entropy will increase
2. entropy change will be zero
3. entropy change of the surroundings will be zero
of these statements
1 and 3 are correct
2 alone is correct
2 and 3 are correct
A alone is correct
Consider the following statements:
The definition of
temperature is due to zeroth law of thermodynamics
entropy is due to first law of thermodynamics
internal energy is due to second law of thermodynamics
reversibility is due to Kelvin-planck’s statement
identify the correct statements using the codes given below:
1, 2 and 3
1, 3 and 4
1 alone
2 alone
Availability of a system at any given state is
A property of the system
The total energy of the system
The maximum work obtainable as the system goes to dead state
The maximum useful work obtainable as the system goes to dead state.
Consider the following statements:
availability is generally conserved
availability can either be negative or positive
availability is the maximum theoretical work obtainable
availability can be destroyed in irreversibility.
Which of these statements are correct?
3 and 4
1 and 2
1 and 3
2 and 4
Which one of the followings is not a true statement?
Lowr the sink temperature, more is the heat rejected for a given heat supply
A system is said to be in its dead state when its available energy is zero
Availability refers to the maximum possible useful work thath could be obtained in constant environmental conditions
Entropy increase is proportional to energy degradation
Boyle’s law states that_________
At constant volume, the pressure of a gas varies directly with temperature
At constant pressure, the volume of a gas varies directly with temperature
Under constant temperature conditions the product of pressure and volume of a given mass of gas is always constant
The volume of a given mass of gas held at constant temperature is directly proportional to its pressure