1 BTU is equal to how many joules?
A1016
B1043
C1023
D1054
ESAS · Question Bank
Thermodynamics
308 of 308 questions match · page 10 of 16. Answer in your head first, then check the solution.
The term "enthalpy" comes from the Greek "enthalpien" which means
Awarm
Bhot
Cheat
Dcold
The ratio of the mass of vapor to the total mass of the mixture is called _______
AVapor ratio
BVapor content
CVapor index
DQuality
The "equation of state" refers to any equation that relates the _______ of the substance
Apressure and temperature
Bpressure, temperature and specific weight
Ctemperature and specific weight
Dpressure, temperature and specific volume
In the equation Pv=RT, the constant of proportionality R is known as ________
Auniversal gas constant
Bgas constant
Cideal gas factor
Dgas index
The gas constant of a certain gas is the ratio of:
Auniversal gas constant to molar mass
Buniversal gas constant to atomic weight
Cuniversal gas constant to atomic number
Duniversal gas constant to number of moles
What is the value of the universal gas constant in kJ/kmol-K?
A10.73
B1.986
C8.314
D1545
The _______ of a substance is the amount of heat that must be added or removed from a unit mass of the substance to change its temperature by one degree
Alatent heat of fusion
Bmolar heat
Cspecific heat capacity
Dspecific heat
What is the specific heat capacity of water in J/kg ºC?
A4581
B4185
C4518
D4815
What is the SI unit of specific heat capacity?
AJ/kg
BJ/kg ºF
CJ/kg ºC
DJ/ºC
What is constant for a substance that is considered "incompressible"?
ASpecific volume of density
BPressure
CTemperature
Dall of these
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
What is the measure of the ability of a material to conduct heat?
ASpecific heat capacity
BCoefficient of thermal expansion
CCoefficient of thermal conductivity
DThermal conductivity
What refers to the heating of the earth's atmosphere not caused by direct sunlight but by infrared by the surface and absorbed mainly by atmospheric carbon dioxide?
AGreenhouse effect
BGlobal warming
CThermal rise effect
DOzone effect
What is a form of mechanical work which is related with the expansion and compression of substances?
ABoundary work
BThermodynamic work
CPhase work
DSystem work
Thermal radiation is an electromagnetic radiation with wavelengths in _______ range
A1 to 100µm
B0.1 to 100µm
C0.1 to 10µm
D10 to 100µm
What refers to the rate of thermal radiation emitter per unit area of a body?
AThermal conductivity
BAbsorptivity
CEmissivity
DEmissive power
What states that for any two bodies in thermal equilibrium, the ratios of emissive power to absorptivity are equal?
AKirchoff's radiation law
BNewton's law of cooling
CStefan-Boltzmann law
DHess's law
What is considered as a perfect absorber as well as a perfect emitter?
AGray body
BBlack body
CReal body
DWhite body