THERMODYNAMICS AND HEAT
TRANSFER CHAPTER 6&7 EXAM
QUESTIONS WITH VERIFIED ANSWERS
It is impossible to construct a device that operates in a cycle and involves no other
interaction other than transfers heat from high to low temperature. - ANSWER-Clausius
Statement of the second law
Receive heat from a low-temp reservoir, reject heat to a high-temp reservoir -
ANSWER-Characteristics of a refrigerator
Heat discharged to the heated space divided by work input - ANSWER-COP of heat
pump
(1-1/COP)(Heat supply rate) - ANSWER-Heat input for a heat pump
Friction, heat transfer through a finite temperature difference - ANSWER-From the list
below, select all that are examples of irreversibilities
Heat pump, air conditioner - ANSWER-Devices that Clausius statement applies to
Heat transfer - ANSWER-Which one of the following irreversibilities describes energy
transfer from high-temp to low-temp
Greater than - ANSWER-COP of heat pump is _____ ____ that of a refrigerator
operating at the same conditions
Heat discharged to the heated space divided by the work input. - ANSWER-Which
statement describes the coefficient of performance of e heat pump?
(1) Rev isothermal expansion, (2) Rev adiabatic expansion, (3) Rev isothermal
compression, (4) Rev adiabatic compression - ANSWER-Select all of the following that
make up the Carnot cycle
1-(TL/TH) (absolute temperatures) - ANSWER-Carnot efficiency
Mass flow, heat transfer - ANSWER-Processes that can transfer entropy
Entropy is a thermodynamic property, entropy change can be used as a measure of
irreversibilities, performance of engineering systems is degraded by irreversibilities -
ANSWER-Which of the following statements are true regarding entropy (7.1-7.3)
intensive - ANSWER-Entropy is an ________ property
TRANSFER CHAPTER 6&7 EXAM
QUESTIONS WITH VERIFIED ANSWERS
It is impossible to construct a device that operates in a cycle and involves no other
interaction other than transfers heat from high to low temperature. - ANSWER-Clausius
Statement of the second law
Receive heat from a low-temp reservoir, reject heat to a high-temp reservoir -
ANSWER-Characteristics of a refrigerator
Heat discharged to the heated space divided by work input - ANSWER-COP of heat
pump
(1-1/COP)(Heat supply rate) - ANSWER-Heat input for a heat pump
Friction, heat transfer through a finite temperature difference - ANSWER-From the list
below, select all that are examples of irreversibilities
Heat pump, air conditioner - ANSWER-Devices that Clausius statement applies to
Heat transfer - ANSWER-Which one of the following irreversibilities describes energy
transfer from high-temp to low-temp
Greater than - ANSWER-COP of heat pump is _____ ____ that of a refrigerator
operating at the same conditions
Heat discharged to the heated space divided by the work input. - ANSWER-Which
statement describes the coefficient of performance of e heat pump?
(1) Rev isothermal expansion, (2) Rev adiabatic expansion, (3) Rev isothermal
compression, (4) Rev adiabatic compression - ANSWER-Select all of the following that
make up the Carnot cycle
1-(TL/TH) (absolute temperatures) - ANSWER-Carnot efficiency
Mass flow, heat transfer - ANSWER-Processes that can transfer entropy
Entropy is a thermodynamic property, entropy change can be used as a measure of
irreversibilities, performance of engineering systems is degraded by irreversibilities -
ANSWER-Which of the following statements are true regarding entropy (7.1-7.3)
intensive - ANSWER-Entropy is an ________ property
