Exam (elaborations)
Engineering Thermodynamics Questions and Answers
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Engineering Thermodynamics
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Engineering ThermodynamicsIf the ideal gas law is applicable, we know enthalpy and internal energy are a function of
which thermodynamic property? - answer Temperature
An open system allows [blank] to cross the boundary, while a closed system allows
[blank] to cross the boundary. - answer mass & energy ; energy
What is the thermal efficiency of a heat engine with the following values: Qin=60Btu,
Qout=40Btu - answer33%
True or False? If the temperatures of two objects are equal, their internal energies are
equal. - answer False
What is a thermodynamic process? - answer Transformation from one state to another.
What is a thermodynamic state? - answer conditions of a system as described by its
properties.
Specific heats relate temperature to what two types of energy? - answer internal energy
& enthalpy
True or False? Temperature is dependent on material type. - answer False
Referring to sign conventions of the First Law of Thermodynamics for a control
boundary, for heat and work, what are positive quantities? - answerWork out, and heat
in
When a control volume is at steady-state, every property is independent of time. True or
False? - answerTrue
A device in which power is developed as a result of gas or liquid passage through a set
of blades attached to a rotating shaft is termed a? - answerTurbine
It is possible for a heat engine operating between a fixed heat source, T1, and a heat
sink, T2, and continuously delivering work can be more efficient than a reversible
Carnot engine operating between these same two temperatures. True or False? -
answerFalse
It is impossible for any system to operate in such a way that the sole result would be in
energy transfer by heat from a cooler body to a hotter body. Furthermore, it is
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