2
Thermodynamics Final Exam multiple choice questions with verified || || || || || || || ||
detailed answers ||
If the ideal gas law is applicable, we know enthalpy and internal energy are a function of
|| || || || || || || || || || || || || || || || ||
which thermodynamic property? - ✔✔temperature
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An open system allows__________to cross the boundary, while a closed system
|| || || || || || || || || || ||
allows_________to cross the boundary. - ✔✔mass & energy; energy || || || || || || || ||
What is the thermal efficiency a heat engine with the following values: Qin=100 Btu,
|| || || || || || || || || || || || || ||
Qout=60 Btu? - ✔✔n=Wcycle/Qin Wcycle=Qin-Qout
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40%
If the temperatures of two objects are equal, their internal energies may not be equal. -
|| || || || || || || || || || || || || || || ||
✔✔True
What is a thermodynamic process? - ✔✔How a substance changes from one state to
|| || || || || || || || || || || || || ||
another.
What is a thermodynamic state? - ✔✔The state that a substance is in.
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i.e. solid, liquid, gas
|| || ||
Specific heats relate temperature to what two types of energy? - ✔✔internal energy &
|| || || || || || || || || || || || || ||
enthalpy
Temperature is dependent on material type. - ✔✔False
|| || || || || || ||
, 2
Referring to the sign conventions of the 1st law of thermodynamics for a control boundary,
|| || || || || || || || || || || || || || ||
which of these are positive quantities? - ✔✔work out & heat in
|| || || || || || || || || || ||
Name the 4 principal temperature scales used: - ✔✔Fahrenheit, Rankine, Celsius, Kelvin
|| || || || || || || || || || ||
A control volume is a system that..... - ✔✔allows the transfer of matter across its boundary
|| || || || || || || || || || || || || || ||
A system is said to be at___________if none of its properties changes with time. -
|| || || || || || || || || || || || || || ||
✔✔steady-state
A closed system always contains the same matter; there is no transfer of matter across its
|| || || || || || || || || || || || || || || ||
boundary. - ✔✔True || ||
The composition of a closed system cannot change, - ✔✔False
|| || || || || || || || ||
The specific volume is the reciprocal of density. - ✔✔True
|| || || || || || || || ||
List the 3 modes of energy transfer by heat and a short statement for each regarding the
|| || || || || || || || || || || || || || || || ||
differences among them. - ✔✔radiation-emitted; doesn't need a medium
|| || || || || || || ||
convection-usually requires a fluid || || ||
conduction-needs a medium; intimate contact || || || ||
Mathematically, power is related to the amount of energy transfer by work by integrating
|| || || || || || || || || || || || || ||
over time. - ✔✔True
|| || ||
Thermodynamics Final Exam multiple choice questions with verified || || || || || || || ||
detailed answers ||
If the ideal gas law is applicable, we know enthalpy and internal energy are a function of
|| || || || || || || || || || || || || || || || ||
which thermodynamic property? - ✔✔temperature
|| || || ||
An open system allows__________to cross the boundary, while a closed system
|| || || || || || || || || || ||
allows_________to cross the boundary. - ✔✔mass & energy; energy || || || || || || || ||
What is the thermal efficiency a heat engine with the following values: Qin=100 Btu,
|| || || || || || || || || || || || || ||
Qout=60 Btu? - ✔✔n=Wcycle/Qin Wcycle=Qin-Qout
|| || || ||
40%
If the temperatures of two objects are equal, their internal energies may not be equal. -
|| || || || || || || || || || || || || || || ||
✔✔True
What is a thermodynamic process? - ✔✔How a substance changes from one state to
|| || || || || || || || || || || || || ||
another.
What is a thermodynamic state? - ✔✔The state that a substance is in.
|| || || || || || || || || || || ||
i.e. solid, liquid, gas
|| || ||
Specific heats relate temperature to what two types of energy? - ✔✔internal energy &
|| || || || || || || || || || || || || ||
enthalpy
Temperature is dependent on material type. - ✔✔False
|| || || || || || ||
, 2
Referring to the sign conventions of the 1st law of thermodynamics for a control boundary,
|| || || || || || || || || || || || || || ||
which of these are positive quantities? - ✔✔work out & heat in
|| || || || || || || || || || ||
Name the 4 principal temperature scales used: - ✔✔Fahrenheit, Rankine, Celsius, Kelvin
|| || || || || || || || || || ||
A control volume is a system that..... - ✔✔allows the transfer of matter across its boundary
|| || || || || || || || || || || || || || ||
A system is said to be at___________if none of its properties changes with time. -
|| || || || || || || || || || || || || || ||
✔✔steady-state
A closed system always contains the same matter; there is no transfer of matter across its
|| || || || || || || || || || || || || || || ||
boundary. - ✔✔True || ||
The composition of a closed system cannot change, - ✔✔False
|| || || || || || || || ||
The specific volume is the reciprocal of density. - ✔✔True
|| || || || || || || || ||
List the 3 modes of energy transfer by heat and a short statement for each regarding the
|| || || || || || || || || || || || || || || || ||
differences among them. - ✔✔radiation-emitted; doesn't need a medium
|| || || || || || || ||
convection-usually requires a fluid || || ||
conduction-needs a medium; intimate contact || || || ||
Mathematically, power is related to the amount of energy transfer by work by integrating
|| || || || || || || || || || || || || ||
over time. - ✔✔True
|| || ||
