Which of the following is the Ideal gas law (equation)?
A\( V/T = k \)
B\( V = k/p \)
C\( P_1/T_1 = P_2/T_2 \)
D\( PV = nRT \)
ESAS · Question Bank
Thermodynamics
255 questions · page 1 of 13. Answer in your head first, then check the solution.
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
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
Water boils when:
Aits saturated vapor pressure equals the atmospheric pressure
Bits vapor pressure equals 76 cm of mercury
Cits temperature reaches \( 212^\circ C \)
Dits vapor pressure is 1 gram per sq. cm
How many independent properties are required to completely fix the equilibrium state of a pure gaseous compound?
A4
B3
C2
D1
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 of the following is standard temperature and pressure (STP)?
A\( 0^\circ C \) and one atmosphere
B\( 32^\circ F \) and zero pressure
C\( 0 K \) and one atmosphere
D\( 0^\circ F \) and zero pressure
For a heat engine operating between two temperatures (\( T_2 > T_1 \)), what is the maximum efficiency attainable?
A\( 1 - T_1/T_2 \)
B\( 1 - T_2/T_1 \)
C\( T_1 - T_2 \)
D\( 1 - T_1^2/T_2 \)
What is the value of work done for a closed, reversible isometric system?
Azero
Bpositive
Cnegative
Dpositive or negative
The first law of thermodynamics is based on which principle?
AConservation of mass
BConservation of energy
CAction and reaction
DEntropy–temperature relationship
Which cycle is used in a vapor cycle power plant?
ABrayton cycle
BDiesel cycle
CEricson cycle
DRankine cycle
Which ideal cycle involves both constant pressure and constant volume heat addition?
AEricson cycle
BDual cycle
CBrayton cycle
DRankine cycle
Which of the following is not a thermodynamic property?
APressure
BTemperature
CVolume
DPhase
What is the compressibility factor of an ideal gas?
A1
B2
C1.5
D0
The energy that includes all kinetic and potential energies of molecules is called:
AInternal energy
BEnthalpy
CEntropy
DTotal energy
Which properties depend on the amount of substance present?
AExtensive properties
BIntensive properties
CReversible properties
DIrreversible properties
Which properties are independent of the amount of substance present?
AIntensive properties
BExtensive properties
CReversible properties
DIrreversible properties
What is the total heat content and useful energy of a substance?
AEnthalpy
BEntropy
CInternal energy
DLatent heat
What measures energy unavailable for useful work and molecular randomness?
AEntropy
BEnthalpy
CInternal energy
DFlow work
What is the temperature when water and vapor are in equilibrium at atmospheric pressure?
AIce point
BSteam point
CCritical point
DFreezing point