During adiabatic, internally reversible process, what is true about the change in entropy?
AIt is temperature-dependent
BIt is always greater than zero
CIt is always zero
DIt is always less than zero
ESAS · Question Bank
Thermodynamics
34 of 308 questions match · page 1 of 2. Answer in your head first, then check the solution.
How does an adiabatic process compare to an isentropic process?
Aadiabatic: heat transfer is not equal to zero; isentropic: heat transfer is zero
BBoth: heat transfer = 0; isentropic: reversible
Cadiabatic: heat transfer = 0; isentropic: heat transfer is not equal to zero
DBoth: heat transfer is not equal to zero; isentropic: irreversible
In an ideal gas mixture of constituents i and j, what is the mole fraction x equal to?
A\( P_i/(P_i+P_j) \)
B\( P_iV_i/RT \)
C\( T_i/(T_i+T_j) \)
D\( Z_i/(Z_i+Z_j) \)
Which ideal cycle involves both constant pressure and constant volume heat addition?
AEricson cycle
BDual cycle
CBrayton cycle
DRankine cycle
A property that indicates the natural direction of a process is called entropy. Who coined the word entropy?
ARudolf Clausius
BLord Kelvin
CGabriel Volks
DRudolf Diesel
Which law states that the entropy of all perfect crystalline solids is zero at absolute zero temperature?
AZeroth law of thermodynamics
BFirst law of thermodynamics
CSecond law of thermodynamics
DThird law of thermodynamics
Otto cycle consists of:
ATwo isentropic and two constant volume processes
BTwo isentropic and two constant pressure processes
CTwo adiabatic and two isothermal processes
DTwo isothermal and two constant volume processes
An ideal gas is compressed isothermally. The enthalpy change is:
AAlways negative
BAlways positive
CZero
DUndefined
Entropy is the measure of:
AThe internal energy of a gas
BThe heat capacity of a substance
CRandomness or disorder
DThe change in enthalpy of a system
During an adiabatic process, which of the following is the change in entropy?
AZero
BGreater than zero
CLess than zero
DInfinity
Which of the following best describes an adiabatic process?
AThe system does no work nor is work done on it
BThe temperature of the system remains constant
CThe heat of the system is changing
DNo heat enters or leaves the system
An ideal heat engine can be 100% efficient only if its exhaust temperature is:
AThe same as the input temperature
BGreater than the input temperature
CLess than the input temperature
D\( 0 \) K temperature
Which law of thermodynamics leads to the definition of entropy?
AFirst law
BSecond law
CThird law
DLaw of conservation of energy
What is another term for the enthalpy-entropy (\( h-s \)) diagram?
AEnthalpy diagram
BMollier diagram
CSteam diagram
DEntropy chart
"The enthalpy change for any chemical reaction is independent of the intermediate stages, provided the initial and final conditions are the same for each route" This statement is known as:
ADulong's law
BDalton's law
CHess's law
DPetit law
An isentropic process on a T-s diagram is easily recognized as a
Ahorizontal line segment
Bvertical line segment
Coblique line segment
Dparabola
A pure substance at absolute zero temperature is in perfect order, and its entropy is zero. This is best known as
AThe 1st law of thermodynamics
BThe 2nd law of thermodynamics
CThe 3rd law of thermodynamics
DThe 0th law of thermodynamics
The term "enthalpy" comes from the Greek "enthalpien" which means
Awarm
Bhot
Cheat
Dcold
The term "adiabatic" comes from the Greek "adiabatos" which means _________
Ano heat
Bno transfer
Cnot to be passed
Dno transformation
How does an adiabatic process compare to an isentropic process?
AAdiabatic: heat transfer is not equal to zero; isentropic: heat transfer is zero
BBoth: heat transfer = 0 ; isentropic : reversible
CAdiabatic: heat transfer is = 0; isentropic: heat transfer is not equal to zero
DBoth: heat transfer is not equal to zero ; isentropic : irreversible