ESAS · Question Bank

Thermodynamics

255 questions · page 11 of 13. Answer in your head first, then check the solution.

#201
What is a body that emits a constant emissivity regardless of the wavelength?
AGray body
BBlack body
CReal body
DWhite body
#202
At same temperature, the radiation emitted by all real surfaces is _______ the radiation emitted by a black body
Aless than
Bgreater than
Cequal to
Deither less than or greater than
#203
Which is NOT a characteristic of emissivity?
AIt is high with most nonmetals
BIt is directly proportional to temperature
CIt is independent with the surface condition of the material
DIt is low with highly polished metals
#204
What is the emissivity of a black body?
A0
B1
C0.5
D0.25
#205
What is the absorptivity of a black body?
A0
B1
C0.5
D0.25
#206
What is sometimes known as the "Fourth-power law"?
AKirchoff's radiation law
BNewton's law of cooling
CStefan-Boltzmann law
DHess's law
#207
The equation Ein - Eout =dE system is known as __________
AEnergy conservation
BEnergy equation
CEnergy balance
DEnergy conversion equation
#208
What remains constant during a steady-flow process?
AMass
BEnergy content of the control volume
CTemperature
DMass and energy content of the control volume
#209
Thermal efficiency is the ratio of:
Anet work input to total heat input
Bnet work output to total heat output
Cnet work output to total heat input
Dnet work input to total heat output
#210
What law states that it is impossible to operate an engine operating operating in a cycle that will have no other affect than to extract heat from a reservoir and turn it into an equivalent work?
AZeroth law of thermodynamics
BFirst law of thermodynamics
CSecond law of thermodynamics
DThird law of thermodynamics
#211
Which statement of the second law of thermodynamics states that no heat engine can have a thermal efficiency of 100%?
AKelvin-Plack statement
BClausius statement
CKelvin statement
DRankine statement
#212
What is the ratio of the useful heat extracted to heating value?
ACombustion efficiency
BPhase efficiency
CHeat efficiency
DWork efficiency
#213
What is defined as the ratio of the net electrical power output to the rate of fuel energy input?
ACombustion efficiency
BThermal efficiency
COverall efficiency
DFurnace efficiency
#214
What refers to the amount of heat removed from the cooled space in BTS's for 1 watt-hour of electricity consumed?
ACost efficiency rating
BEnergy efficiency rating
CCoefficient of performance
DCost of performance
#215
What law states that it is impossible to build a device that operates in a cycle and produces no effect other than the transfer of heat from a lower temperature body to a higher temperature body
AZeroth law of thermodynamics
BFirst law of thermodynamics
CSecond law of thermodynamics
DThird law of thermodynamics
#216
What statement of the second law of thermodynamics states that it is impossible to build a device that operates in a cycle and produces no effect other than the transfer of heat from a lower temp to a hi temp body?
AKelvin-Planck statement
BClausius statement
CKelvin statement
DRankine statement
#217
A device that violates either the first law of thermodynamics or the second law of thermodynamics is known as _________
Aambigous machine
Buniversal machine
Cperpetual-motion machine
Dunique machine
#218
A device that violates the first law of thermodynamics is called a __________
Aperpetual-motion machine of the first kind
Buniversal machine of the first kind
Cambigous machine of the first kind
Dunique machine of the first kind
#219
A device that violates the second law of thermodynamics is called a __________
Aperpetual-motion machine of the second kind
Buniversal machine of the second kind
Cambigous machine of the second kind
Dunique machine of the second kind
#220
Carnot cycle is the best known reversible cycle which was first proposed in what year?
A1842
B1824
C1832
D1834

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