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Fundamentals of Engineering Thermodynamics Ch 1 Questions with correct Answers
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Fundamentals of Engineering Thermodynamics Ch 1
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Fundamentals of EngineeringThermodynamics Ch 1
System - answer whatever we want to study. It may be as simple as a free body or
as complex as an entire chemical refinery.
Surrounding - answer everything external to the system
Boundary - answer the system is separate from its surrounding from its surrounding by
a boundary that may or may not be in motion
Control system/ Control mass - answer a fixed quantity of mass
control volume - answer a region of space through which mass may flow.
control mass + control volume = - answer control surface
Closed System - answerwhen a particular quantity of matter is under study.
Isolated System - answerA special type of closed system that does not interact in any
way
with its surroundings
the choice of system boundary is governed by two considerations: - answer(1) what is
known about a possible system, particularly at its boundaries, and (2) the
objective of the analysis.
Classical Thermodynamics - answerThe macroscopic approach to thermodynamics is
concerned with the gross or overall behavior.
Macroscopic approach - answerknown as statistical thermodynamics, is concerned
directly with the structure of matter.
Microscopic approach - answerinterpret internal energy and entropy
Property - answera macroscopic characteristic of a
system such as mass, volume, energy, pressure, and temperature to which a numerical
value can be assigned at a given time without knowledge of the previous behavior
(history) of the system.
State - answercondition of a system as described by its properties
, Process - answerWhen any of the properties of a system changes, the state changes
and the system
is said to undergo a process. Transformation from one state to another
Steady State - answerA system is said to be at steady state if none of its
properties changes with time.
extensive property - answerA property is called extensive if its value for an overall
system is the sum of its values for the parts into which the system is divided. can
change with time.
Intensive property - answerare not additive in the sense previously considered. Their
values are independent of the size or extent of a system and may vary from place to
place within the system at any moment. Intensive properties may be functions of both
position and time, whereas extensive properties can vary only with time. Specific
volume (Sec. 1.5), pressure, and temperature are important intensive properties;
Equilibrium - answerIn mechanics, equilibrium means a condition of balance maintained
by an equality of opposing forces. In thermodynamics, the concept is more far-reaching,
including not only a balance of forces but also a balance of other influences. Each kind
of influence refers to a particular aspect of thermodynamic, or complete, equilibrium.
Accordingly, several types of equilibrium must exist individually to fulfill the condi-
tion of complete equilibrium; among these are mechanical, thermal, phase, and chem-
ical equilibrium.
Equilibrium State - answerIf there are no changes, we conclude
that the system was in equilibrium at the moment it was isolated.
base unit - answerUnits for all other quantities are then derived in terms of the base
units.
SI Base Unit - answerkg, m, s
English Base Unit - answerlb, ft, s
Continuum hypothesis - answermatter is simplified by considering it to be distributed
continuously throughout a region. The correctness of this idealization, known as the
continuum hypothesis, is inferred from the fact that for an extremely large class of
phenomena of engineering interest the resulting description
of the behavior of matter is in agreement with measured data.
Specific Volume - answerthe reciprocal of the density, 5 1/. It is the
volume per unit mass. an intensive property
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