ME121-ENGINEERING
THERMODYNAMICS EXAM QUESTIONS
WITH CORRECT ANSWERS
Intensive property - ANSWER-values are independent of the size/extent of the system;
may vary from place to place within the system at any moment, (maybe functions of
both position and time) e.g., density, temperature, pressure, specific volume
Equilibrium - ANSWER-This refers to when a system has reached a state where there is
no spontaneous change over time.
True - ANSWER-True or False. A quantity is a property if its change in values between
two states is independent of the process.
Kelvin-Planck Statement - ANSWER-It is impossible for any device that operates on a
cycle to receive heat from a single reservoir and produce a net amount of work.
Phase - ANSWER-refers to a quantity of matter that is homogeneous (all solid, liquid or
gas) throughout in both chemical
composition and physical structure.
False - ANSWER-True or false. A system cannot contain
one or more phases
Phase boundaries - ANSWER-In the phase diagram, it is the line separating two
different phases.
Pure substance - ANSWER-one that is uniform and invariable in chemical composition.
can exist in more than one phase, but its chemical composition must be the same
in each phase.
Clausius Statement - ANSWER-It is impossible for any system to operate in such a way
that the sole result would be an energy transfer by heat from a cooler to a hotter body.
True - ANSWER-True or False. A system consisting of air can be regarded as a pure
substance as
long as it is a mixture of gases; but if a liquid phase should form on cooling, the liquid
would
have a different composition from the gas phase, and the system would no longer be
considered
a pure substance.
, Fourier's law - ANSWER-What is the governing law in the study of conductive heat
transfer?
True - ANSWER-True or False. Natural convective heat transfer does not require
mechanical means to induce flow.
True - ANSWER-Ang mubasa batig nawong.
True - ANSWER-True or False. Newtonian Mechanics applies most accurately to
macroscopic analysis.
Resistance - ANSWER-In uni-directional conductive heat transfer, this is defined
mathematically as the ratio of the plate's thickness to its coefficient of thermal
conductivity.
Potential - ANSWER-A ball thrown vertically up will reach maximum __________
energy at the top point of rest.
Charle's Law - ANSWER-V1/T1=V2/T2
False - ANSWER-True or False. The flow of heat is only restricted from high
temperature to low temperature. This is a natural phenomenon that can never be
reversed with or without the use of any mechanical systems.
False - ANSWER-True or False. Gravity can only increase and not decrease a body's
kinetic energy irrespective of the motion.
Entropy Statement - ANSWER-It is impossible for any system to operate in a way that
entropy is destroyed.
Black body - ANSWER-It is the term given to a body that can absorb all radiative heat it
receives without any loss.
False - ANSWER-True or False. Solar panels must be encased with highly reflective
glass to reduce solar radiation loss.
Film Coefficient - ANSWER-In convective heat transfer, it serves as a conducting barrier
to heat flow and is unique to different fluids. It is analogous to the coefficient of thermal
conductivity in conductive heat transfer.
Positive - ANSWER-Positive or Negative. What notation is used for work of gas that is
expanding inside a piston-cylinder assembly?
Low High - ANSWER-The idealization of a real gas is not valid for condition of
_________ temperature and a ______________ pressure.
THERMODYNAMICS EXAM QUESTIONS
WITH CORRECT ANSWERS
Intensive property - ANSWER-values are independent of the size/extent of the system;
may vary from place to place within the system at any moment, (maybe functions of
both position and time) e.g., density, temperature, pressure, specific volume
Equilibrium - ANSWER-This refers to when a system has reached a state where there is
no spontaneous change over time.
True - ANSWER-True or False. A quantity is a property if its change in values between
two states is independent of the process.
Kelvin-Planck Statement - ANSWER-It is impossible for any device that operates on a
cycle to receive heat from a single reservoir and produce a net amount of work.
Phase - ANSWER-refers to a quantity of matter that is homogeneous (all solid, liquid or
gas) throughout in both chemical
composition and physical structure.
False - ANSWER-True or false. A system cannot contain
one or more phases
Phase boundaries - ANSWER-In the phase diagram, it is the line separating two
different phases.
Pure substance - ANSWER-one that is uniform and invariable in chemical composition.
can exist in more than one phase, but its chemical composition must be the same
in each phase.
Clausius Statement - ANSWER-It is impossible for any system to operate in such a way
that the sole result would be an energy transfer by heat from a cooler to a hotter body.
True - ANSWER-True or False. A system consisting of air can be regarded as a pure
substance as
long as it is a mixture of gases; but if a liquid phase should form on cooling, the liquid
would
have a different composition from the gas phase, and the system would no longer be
considered
a pure substance.
, Fourier's law - ANSWER-What is the governing law in the study of conductive heat
transfer?
True - ANSWER-True or False. Natural convective heat transfer does not require
mechanical means to induce flow.
True - ANSWER-Ang mubasa batig nawong.
True - ANSWER-True or False. Newtonian Mechanics applies most accurately to
macroscopic analysis.
Resistance - ANSWER-In uni-directional conductive heat transfer, this is defined
mathematically as the ratio of the plate's thickness to its coefficient of thermal
conductivity.
Potential - ANSWER-A ball thrown vertically up will reach maximum __________
energy at the top point of rest.
Charle's Law - ANSWER-V1/T1=V2/T2
False - ANSWER-True or False. The flow of heat is only restricted from high
temperature to low temperature. This is a natural phenomenon that can never be
reversed with or without the use of any mechanical systems.
False - ANSWER-True or False. Gravity can only increase and not decrease a body's
kinetic energy irrespective of the motion.
Entropy Statement - ANSWER-It is impossible for any system to operate in a way that
entropy is destroyed.
Black body - ANSWER-It is the term given to a body that can absorb all radiative heat it
receives without any loss.
False - ANSWER-True or False. Solar panels must be encased with highly reflective
glass to reduce solar radiation loss.
Film Coefficient - ANSWER-In convective heat transfer, it serves as a conducting barrier
to heat flow and is unique to different fluids. It is analogous to the coefficient of thermal
conductivity in conductive heat transfer.
Positive - ANSWER-Positive or Negative. What notation is used for work of gas that is
expanding inside a piston-cylinder assembly?
Low High - ANSWER-The idealization of a real gas is not valid for condition of
_________ temperature and a ______________ pressure.
