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8/10/2019 Thermodynamics 13 Questions
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THERMODYNAMICS
LORESCO,POCHOLO JAMES M.
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REVIEW QUESTIONS
An internally reversible process of a substance
during which the pressure remains constant.
a.isometric b.isothermal
c.adiabatic d.isobaric
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REVIEW QUESTION
At what temperature do both the Centigrade
and Fahrenheit thermometer show the same
reading?
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REVIEW QUESTION
A vacuum gage connected to a chamber reads
5.8 psi at a location where the atmospheric
pressure is 14.5 psi. Determine the absolute
pressure in the chamber.
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REVIEW QUESTION
Determine the atmospheric pressure at a location where the
barometric reading is 740 mm Hg and the gravitational
acceleration is g 9.81 m/s2. Assume the temperature of
mercury to be 10C, at which its density is 13,570 kg/m3.
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REVIEW PROBLEMS
A pressure gage register 50 psig in a region
where the barometer is 14.25 psia. Find the
absolute pressure in Pa.
a.453 kPa b.434 kPa
c.435 kPa d.443 kPa
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REVIEW QUESTION
Express a pressure gage reading of 35 psi in
absolute pressure
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REVIEW QUESTION
The combined mass of car and passengers
travelling at 72 km/hr is 1500kg. Find the
kinetic energy of this combined mass.
a.300kJ b.330kJ
c.305kJ d. 310kJ
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REVIEW QUESTION
A mass of 5kg is 100m above a given datum where
local g=9.75 m/sec2. Find the gravitational force in
newtonsand the potential energy of the mass w/
respect to the datum. a.49.25 N,4925 J b.52.05 N,5205 J
c.48.75 N,4875 J d.47.85 N,4785 J
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REVIEW QUESTIONS
The energy stored in a substance by virtue of
the activity and configuration of its molecules
and of the vibration of the atoms within the
molecules.
a.Internal Energy b .Heat
c. Enthalpy d.Entropy
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REVIEW QUESTIONS
It is the energy possesses by the system as a
result of its elevation with respect to the
gravitational acceleration of the earth.
a. Potential b.Kinetic
b. . Momentum d.Impulse
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REVIEW QUESTION
A rigid tank contains a hot fluid that is cooled while being
stirred by a paddle wheel. Initially, the internal energy of the
fluid is 800 kJ. During the cooling process, the fluid loses 500
kJ of heat, and the paddle wheel does 100 kJ of work on the
fluid. Determine the final internal energy of the fluid. Neglectthe energy stored in the paddle wheel.
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REVIEW QUESTION
A rigid tank contains a hot fluid that is cooled while being
stirred by a paddle wheel. Initially, the internal energy of the
fluid is 850kJ. During the cooling process, the fluid loses 550kJ
of heat, and the paddle wheel does 200kJ of work on the
fluid. Determine the final energy of the fluid. Neglect theenergy stored in the paddle wheel.
a.500kJ b. 550 kJ c. 600kJ d. 650 kJ
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REVIEW QUESTION
The energy stored in a substance by virtue of
the activity and configuration of its molecules
and of the vibration of the atoms within the
molecules.
a.Internal Energy b .Heat
c. Enthalpy d.Entropy
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REVIEW QUESTION
This Law States that The quantity of the
substance entering the system is equal to the
substance leaving the system
a.1stLaw of Thermodynamics
b.Law of Conservation of Mass
c.Newtons2ndLaw of Motion
d.Law of Conservation of Energy
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REVIEW QUESTION
It is the energy possesses by the system as a
result of its elevation with respect to the
gravitational acceleration of the earth.
A. Potential
B. Kinetic
C. Momentum
D. Impulse
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REVIEW QUESTION
Energy is neither created nor destroyed, but
is converted from one form to another
a. 1stLaw of Thermodynamics
b. Newtons 2ndLaw of Motion
c. 2ndLaw of Thermodynamics
d. Law of Conservation of Mass
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REVIEW QUESTION
When two bodies, isolated from other
environment, are in thermal equilibrium with
a third body, the two are in thermal
equilibrium with each other is a statement of
A. 1stLaw of Thermodynamics
B. Zeroth Law
C. 2ndLaw of Thermodynamics
D. Maxwells Theory of Thermal Equilibrium
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REVIEW QUESTION
The quantity of heat required to change the
temperature of unit mass through one degree.
A. Temperature
B. Specific Heat
C. Thermal Equilibrium
D. Calorie
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REVIEW QUESTION
It is the transfer of energy from the more
energetic particles of substance to the
adjacent less energetic ones as a result of
interactions between the particles.
A. Conduction
B. Radiation
C. Convection
D. Absorption
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REVIEW QUESTION
The energy radiated by a black body has a rate
that is proportional to the absolute
temperature raised to the __ power.
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REVIEW QUESTION
It is the mode of energy transfer between a
solid surface and the adjacent liquid or gas
that is in motion, and it involves the combined
effect conduction and fluid motion.
A. Conduction c. Convection
B. Radiation d. Absorption
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REVIEW QUESTION
It indicates that the rate of heat conduction in
a direction is proportional to the temperature
gradient in that direction.
A. Fouriers Law of Heat Conduction
B. Fouriers Law of Heat Convection
C. Fouriers Law of Heat Radiation
D. Fouriers Law of Heat Absorption
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REVIEW QUESTION
It is the energy emitted by the matter in the
form of electromagnetic waves as a result of
the changes in the electronic configurations of
the atom or molecules.
A. Conduction
B. Radiation
C. Convection
D. Absorption
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REVIEW QUESTION
Consider a person standing in a breezy room at 22C.
Determine the total rate of heat transfer from this person if
the exposed surface area and the average outer surface
temperature of the person are 1.2 m2 and 33C, respectively,
and the convection heat transfer coefficient is 6 W/m2.=0.95and =5.67x10-8W/m4-K4
a.120.5J/s b. 135.7J/s
c. 143.2J/s d. 151.9J/s
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REVIEW QUESTION
The highest temperature at which a gas phase
be changed to the liquid phase by increasing
pressure is called ____.
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REVIEW QUESTION
How much heat is required to convert 40 g of ice at -10C to
steam at 120C? The specific heat capacities of ice, liquid
water, and steam are, respectively, 2.1, 4.2, and 2.0 J/g K;
qfus(ice) = 6.02 kJ/mol and qvap(water) = 40.7 kJ/mol.
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REVIEW QUESTION
What is the enthalpy change when 100 g of
copper is heated from 10C to 100C? CP(Cu) =
0.389 J/gK.
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REVIEW QUESTION
If 80 g of iron shot at 100C is dropped into 200 g
of water at 20C contained in an iron vessel of
mass 50 g, find the resulting temperature.
a.20.1C b. 21.8C c. 22. 3C d. 24.6C
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REVIEW QUESTION
When a 2lb of brass at 212F is dropped into 5lb of
water at 35F, the resulting temperature is 41.2F.
Find the specific heat of brass in Btu/lb-F.
a.1.120 b. 0.091 c. 0.321 d. 1.233
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REVIEW QUESTION
How much heat is necessary to raise the
temperature of 0.80 kg of ethyl alcohol from
15C of its boiling point 78.3C?
a.10kcal b. 20kcal c. 30kcal d. 40kcal
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REVIEW QUESTION
During an isentropic process of 1.36 kg/sec of
air, the temperature increases from 4.44 C to
115.6C. if Cp=1.0062kNm /kgKfor a non-flow
process, what is H?
a.152.2 kg/s b.152.2 J/s
c.152.2 kJ/s d.152.2 Btu/s
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REVIEW QUESTION
The property of a substance which remains
constant if no heat enters or leaves the
system, while it does work or alters its
volume, but which increases or diminishesshould a small amount of heat enter or leave.
A. internal energy
B. system
C. entropy
D. enthalpy
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REVIEW QUESTION
A piston cylinder device contains a liquid-vapor mixture of water
at 400K. During a constant pressure process, 700 KJ of heat is
transferred to the water. As a result, part of the liquid in the
cylinder vaporizes. Determine the entropy change of the
water during this processa. 1.75kJ/K b. 280kJ-K
c. 7000kJ d. 0.57K/kJ
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REVIEW QUESTION
A pistoncylinder device contains a liquidvapor mixture of
water at 300 K. During a constant-pressure process, 750 kJ of
heat is transferred to the water. As a result, part of the liquid
in the cylinder vaporizes. Determine the entropy change of
the water during this process
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REVIEW QUESTION
When a 2lb of brass at 212F is dropped into 5lb of
water at 35F, the resulting temperature is 41.2F.
Find the specific heat of brass in Btu/lb-F.
a.1.120 b. 0.091 c. 0.321 d. 1.233
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REVIEW QUESTION
Determine the mass of the air in a room
whose dimensions are 4 m by 5 m by 6 m at
100 kPa and 25C.
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REVIEW QUESTION
Determine the mass of the air in a room
whose dimensions are (5x6x7) cm at 105 kPa
and 27C.
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REVIEW QUESTIONS
If the temperature of a given quantity of gas
is held constant, the volume of the gas varies
inversely with the absolute pressure during a
change of state
a.General Gas Laws b. Joules Law
c. Charles Law d. Boyles Law
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REVIEW QUESTION
if the pressure of a given quantity of gas is
held constant, the volume of the gas varies
directly with the absolute temperature
a. General Gas Law b. Boyles Law
c. Charles Law d. Joules Law
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REVIEW QUESTIONS
Which of the following equation of state has
two constants?
A. Vander Waals Equation
B. Beattie-Bridgeman Equation
C. Benedict-Webb-Rubin Equation
D. Strobridge Equation
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REVIEW QUESTIONS
The weight-density of air at 32F and 29.92 in Hg
pressure is 0.081 lb/ft3. What is its weight-density, in
lb/ft3, at an altitude where the pressure is 13.73 in
Hg and the temperature is -40F?a.0.044 b. 0.055 c. 0.066 d. 0.77
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REVIEW QUESTIONS
How many constant are there in Strobridge
Equation of State?
a.13 b. 14 c. 15 d. 16
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REVIEW QUESTIONS
Which of the following equation of state has
eight constant?
A. Vander Waals Equation
B. Beattie-Bridgeman Equation
C. Benedict-Webb-Rubin Equation
D. Strobridge Equation
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REVIEW QUESTIONS A pistoncylinder device initially contains 0.4 m3 of air at 100 kPa and
80C. The air is now compressed to 0.1 m3 in such a way that thetemperature inside the cylinder remains constant. Determine the work
done during this process.
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REVIEW QUESTIONS
A piston cylinder device initially contains 0.8 m3 of air at
110kPa and 80C. The air is now compressed to 0.2 m3 in
such a way that the temperature inside the cylinder remains
constant. Determine the work done during this process.
a.-122kJ b. -123kJ c. -124kJ d. -125kJ
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REVIEW QUESTIONS
Three moles of an ideal gas are compressed slowly
and isothermally from a volume of 5 to 1.5 ft3, at a
temperature of 320K. How much work is done?
a.-8.12kJ b. -9.61kJ c. -10.44kJ d. -11.59kJ
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REVIEW QUESTIONS
An internally reversible process of a substance
during which the pressure remains constant.
a.isometric b.isothermal
c.adiabatic d.isobaric
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REVIEW QUESTIONS
Heat is transferred to a heat engine from a furnace at
a rate of 92MW. If the rate of waste heat rejection to
a nearby river is 45MW, determine the net power
output and the thermal efficiency for this heatengine.
a.48.91% b. 51.09% c. 32.84% d. 67.15%
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REVIEW QUESTIONS
Not all energy received as heat by a heat-
engine cycle can be converted into mechanical
work, some are also rejected is a statement
of.
a.1stLaw of Thermodynamic s
b.Zeroth Law
c.2ndLaw of Thermodynamicsd.Law of Conservation of Energy
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REVIEW QUESTION
In second law of thermodynamic, which of the
following state that no heat engine can have a
thermal efficiency of 100% or as far as power
plant to operate, the working fluid mustexchange heat with the environment as well
as the furnace.
A. KelvinPlank StatementB. Clausius-Plank Statement
C. Clausius Statement
D. Kelvin Statement
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REVIEW QUESTION
The food compartment of a refrigerator is
maintained at 4C by removing heat from it at a rate
of 300 KJ/min. If the required power input to the
refrigerator is 3KW, determine the coefficient ofperformance of the refrigerator.
a.1.67 b. 2.33 c. 3.67 d. 4. 12
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REVIEW QUESTION
Carnot cycle is composed of how many
reversible processes?
a. 1 b. 2
c. 3 d. 4
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REVIEW QUESTION
Which of the following processes are involved
in carnot cycle?
A. Two isothermal ; two isobaric
B. One isothermal; three adiabatic
C. Three isobaric; one adiabatic
D. Two adiabatic ; two isothermal
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REVIEW QUESTION
State that the thermal efficiencies of all
reversible heat engines operating between the
same two reservoirs are the same, and that no
heat engine is more efficient than a reversibleone operating between the same two
reservoirs.
A. Throttle principleB. Otto principle
C. Carnot principle
D. Kelvin rinci le
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REVIEW QUESTION
A carnot heat engine receives 500KJ of heat
per cycle from a high-temperature source at
600 C and rejects heat a low temperature
sink at 40C. Determine the thermal efficiencyof this Carnot engine.
a. 93.33% b. 6.67%
c. 35.85% d. 64.15%
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REVIEW QUESTION
A Carnot heat engine receives 500 kJ of heat per cycle from a
high-temperature source at 652C and rejects heat to a low-
temperature sink at 30C. Determine (a) the thermal
efficiency of this Carnot engine and (b) the amount of heat
rejected to the sink per cycle.
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REVIEW QUESTION
_______ states that the partial pressure of a
solvent over a solution is given by the vapor
pressure of the pure solvent times the mole
fraction of the solvent in the solution.
a. Daltonslaw of partial pressure
b. de Broglieshypothesis
c. Aufbau principle
d. RaoultsLaw
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REVIEW QUESTION
_________ states that a constant pressure and
temperature, the volume of a gas is directly
proportional to the number of moles present.
a. Boyles Law
b. CharlesLaw
c. Gay-Lussacs Law
d. AvogradosLaw
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REVIEW QUESTION
This Law states that if a process can be written
as the sum of several stepwise processes, the
Enthalphy change the total process equals the
sum of the Enthalphy changes of the VariousSteps.
a. Gauss Law b. Hess Law
b. Boyles Law d. Newtons Law
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REVIEW QUESTION
A 466g sample of Water is Heated from 8.50C to
74.60C. Calculate the amount of Heat
Absorbed (in Kilo Joules) by the Water.
a. 130 KJ b. 129 KJ
b. 192 KJ d. 160 KJ
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REVIEW QUESTION
It is the enthalpy change associated with the
condensation of gaseous positive and negative
ion into a crystal.
a RaoultsLaw
b. Lattice Energy
c. Enthalpy Of Solution
d. Partition Coefficient
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REVIEW QUESTION
It explains combustion as a result of loss of a
substance.
a. Phlogiston
b. Roasting
c. Reduction
d. Fission
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REVIEW QUESTION
How much heat is necessary to raise the
temperature of 0.80 kg of ethyl alcohol from
15C of its boiling point 78.3C?
10kcal b. 20kcal c. 30kcal d. 40kcal