Answer: B 9. What is known as the total heat and heat content at various times in the history? a. b. c. d.
enthalpy entropy internal energy latent heat
Answer: A 10. What is the measure of the energy that is no longer available to perform useful work within the current environment? a. enthalpy b. entropy c. internal energy
d. latent heat Answer: B 11. What is the temperature when water and vapor are in the equilibrium with the atmospheric pressure? a. b. c. d.
Ice point Steam point Critical point Freezing point
Answer: B 12. What is the unique state at which solid, liquid and gaseous phase can go co-exist in equilibrium? equilibrium? a. b. c. d.
Triple point Critical point Boiling point Pour point
Answer: A 13. What refers to the state at which liquid and gaseous phases are indistinguishable? a. b. c. d.
Triple point Critical point Boiling point Pour point
Answer: B 14. What refers to the heat needed to change the temperature of the substances without changing its phases? a. b. c. d.
Latent heat Sensible heat Specific heat entropy
Answer: B 15. What is defined as the quantity of heat needed to raise the temperature of one kilogram of water by one degrees Celsius?
a. b. c. d.
Kilojoule Btu Kilocalorie Latent heat
Answer: C 16. To what conditions does a gas behave like an ideal gas? a. b. c. d.
low temperature and low pressure low temperature and high pressure high temperature and low pressure high temperature and high pressure
Answer: C
17. What Law states that the pressure of gas is inversely proportional to its volume at constant temperature? a. b. c. d.
Charles’ law Gay-Lussac’s Law Boyle’s Law Dalton’s Law
Answer: C 18. What do you call a system in which there is a flow of matter through the boundary? a. b. c. d.
Closed sysytem Open system Isolated sysytem All of these
Answer: B 19. Which of the following best describes heat? a. b. c. d.
The capacity to do work Forces times distances Sum of thermal and chemical energy An energy transfer due to temperature difference
Answer: D
20. The mechanical equivalent of heat is a. b. c. d.
joule calorie Btu Specific heat
Answer: A 21. Burning of Gasoline initially requires heat before it burns spontaneously. Which of the following does not give a good explanation of this phenomenon? a. b. c. d.
the initial heat rises the enthalpy of the reactant the initial heat lowers the activation of energy of the reactants the enthalpy of reactants is lower than the enthalpy of products. The enthalpy of the product is lower than the enthalpy of the reactant
Answer: C 22. The phenomenon of melting under pressure and freezing again when the pressure is reduced is known as a. b. c. d.
sublimation condensation deposition regelation
Answer: D 23. Which of the following events is heat exchange involved? a. b. c. d.
when there is a phase change when there is a chemical reaction when the gas expands adiabatically when there is difference in temperature
Answer: C 24. What is the entropy of a pure substance at a temperature of absolute zero? a. b. c. d.
unity zero infinity undefined
Answer: B
25. What is the area under the curve on a temperature – entropy diagram? a. b. c. d.
Heat work entropy volume
Answer: A 26. What happens to the internal energy of water at reference temperature where enthalpy is zero? a. b. c. d.
Becomes negative Becomes positive Remains constant Cannot be defined
Answer: A 27. Which of the following is the work done for a closed reversible isometric system? a. b. c. d.
negative positive zero undefined
Answer: C 28. If the initial volume of an ideal gas is compressed to one-half its original volume and to twice its original temperature, the pressure: a. b. c. d.
doubles halves quadruples triples
Answer: C 29. When the expansion of compression of gas takes place without transfer of heat or from the gas the process is called; a. b. c. d.
Isometric process Isothermal process Isobaric process Adiabatic process
Answer: D 30. Which of the following best describes both Stirling and Ericson engines? a. b. c. d.
Answer: B 31. At steam point, the temperature of water and its vapour at standard pressure are: a. b. c. d.
Extremes or maximum unity in equilibrium undefined
Answer: C 32. Who coined the word Entropy? a. b. c. d.
Rudolf Clausius Lord Kelvin Gabriel Volks Rudolf Diesel
Answer: A 33. What is the temperature when water and vapor are in equilibrium with the atmospheric pressure? a. b. c. d.
Ice point Steam point Critical point Freezing point
Answer: B 34. When the expansion of compression of gas takes place without transfer of heat to or from the gas the process is called a. reversible b. adiabatic c. polytropic
d. isothermal Answer: B 35. What refers to a liquid whose temperature is lower than saturation temperature corresponding to the exisitng pressure? a. b. c. d.
Subcooled liquid Saturated liquid Pure liquid Compressed liquid
Answer: A 36. Which law that states “Entropy of all perfect crystalline solids is zero at absolute zero temperature”? a. b. c. d.
Zeroth law of thermodynamics First law of thermodynamics Second law of thermodynamics Third law of thermodynamics
Answer: D 37. A 0.064 kg of octane vapor (MW = 114) is mixed with 0.91 kg of air (MW = 29.0) in the manifold of an Engine. The total pressure in the manifold is 86.1 kPa, and a temperature is 290 K. assume octane behaves ideally. What is the partial pressure of the air in the mixture in KPa? a. b. c. d.
46.8 48.6 84.6 64.8
Answer: C 38. Which of the following occurs in a reversible polytropic process? a. b. c. d.
Enthalpy remains constant Internal energy does not change Some heat transfer occurs Entropy remains constant
Answer: C
39. The change that the system that undergoes from one equilibrium state to another is known as a. b. c. d.
oath process enthalpy change entropy change
Answer: B 40. What refers to the series of states through which a system passes during the process? a. b. c. d.
Answer: A 61. Which of the following thermodynamic devices operates the reverse of the heat engine? a. b. c. d.
Thermal Thermal Thermal Thermal
pump evaporator condenser equilibrant
Answer: A 62. What is another term used for isometric processes? a. b. c. d.
Isochoric process Iolytropic process Isothermal process Reversible process
Answer: A 63. Which of the following engines was introduced by a German engineer, Nickolas Otto? a. b. c. d.
Gasoline engine Diesel engine Gas turbine Thermal engine
Answer: A 64. If two systems are in the thermal equilibrium with a third system, then they must be in thermal equilibrium with each other. a. b. c. d.
Zeroth Law of Thermodynamics First Law of Thermodynamics Second Law of Thermodynamics Third Law of Thermodynamics
Answer: A 65. The heat absorbed by a unit mass of a material at its holding point in order to convert the material into a gas at the same temperature. a. b. c. d.
Latent Heat of Sublimation Latent Heat of Vaporization Latent Heat of Fusion Latent Heat Of Condensation
Answer: B 66. A thermodynamic process in which entropy is conserved a. b. c. d.
isentropic adiabatic isothermal polytropic
Answer: A
67. A control volume refers to what? a. b. c. d.
A fixed region in space A reversible process an isolated system a specified mass
Answer: A 68. Which of the following is commonly used as liquid absorbent? a. Silica gel b. Activated alumina c. Ethylene glycol
d. None of these Answer: C 69. One for which no heat is gained or lost a. b. c. d.
Isentropic Adiabatic Isothermal Polytropic
Answer: B 70. A law relating the pressure, temperature and volume of an ideal gas a. b. c. d.
Gay-Lussac’s Law Ideal gas Law Charles’ Law Boyle’s Law
Answer: B 71. Occurs when the vapor pressure equals the atmospheric pressure a. b. c. d.
Boiling Melting Freezing Vaporizing
Answer: A 72. As temperature goes to “0”, the entropy approaches a constant a. b. c. d.
Zeroth Law of Thermodynamics First Law of Thermodynamics Second Law of Thermodynamics Third Law of Thermodynamics
Answer: D 73. An ideal gas is compressed ina cylinder so well insulated that there is essentially no heat transfer. The temperature of gas a. Remains constant b. increases c. decreases
d. is basically zero Answer: B 74. Occuring at fixed temperature a. b. c. d.
isentropic Adiabatic Isothermal polytropic
Answer: C 75. The changing of solid directly to vapor without passing through liquid state is called a. b. c. d.
Evaporation Vaporization Sublimation Condensation
Answer: C 76. The phase transition of a liquid to a solid a. b. c. d.
Solidification Freezing Fusion All of these
Answer: D 77. It is an energy flux, equal to the rate of energy flow per unit area per unit time across some surface. a. b. c. d.
Answer: C 78. The volume of a gas under constant pressure increases or decrease with temperature. a. Gay- Lussac’s Law
b. Ideal Gas Law c. Charles’ Law d. Boyle’s Law Answer: C 79. The molecular number density of an ideal gas at standard temperature and 3 pressure in cm a. b. c. d.
Froude number Loschmidt number Mach number Reynold number
Answer: B 80. A temperature scale whose zero point is absolute zero, the temperature of “0” entropy at which all molecular motion stops. a. b. c. d.
Celsius Fahrenheit Kelvin Rankine
Answer: C 81. The thermal radiation emitted by a blackbody heated to a given temperature. a. b. c. d.
Gamma Radiation Black Body Radiation Electromagnetic Radiation Alpha Radiation
Answer: B 82. The radiation emitted by a body as a result of its temperature. a. b. c. d.
Answer: D 83. At Equilibrium, the radiation emitted must equal the radiation absorbed.
a. b. c. d.
Boyle’s Law Planck’s Law Kirchoff’s Law Joule’s Law
Answer: C 84. The theory that heat consisted of a fluid, which could be transferred from one body to another, but not “created” or “destroyed”. a. b. c. d.
Clausius Theorem Caloric Theory Joules Law Newton’s Law of cooling
Answer: B 85. The volume of a gas is directly proportional to the number of molecules of the gas. a. b. c. d.
Ideal gas law Boyle-Mariotte Law Avogadro’s Hypothesis Gay-Lussac’s Law of combining Volumes
Answer: C 86. For a body cooling in a draft, the rate of heat loss is proportional to the difference in temperature between the body and its surroundings. a. b. c. d.
Nemst Effect Caloric Theory Joule’s Law Newton’s Law of Cooling
Answer: D 87. It is the intensity of a radiating source. a. b. c. d.
Specific Brightness Radiance Surface Brightness All of these
Answer: D
88. This law of thermodynamics prohibits the construction of a perpetual motion machine “of the second kind” a. b. c. d.
Zeroth Law of Thermodynamics First Law of Thermodynamics Second Law of Thermodynamics Third Law of Thermodynamics
Answer: C 89. A cylinder contains oxygen at a pressure of 10 atm and a temperature of 300 K. The volume of the cylinder is 10 liters. What is the mass of the oxygen in grams? Molecular weight (MW) of oxygen is 32g/mole? a. b. c. d.
125.02 130.08 135.05 120.04
Answer: B {(10atm)(10)(32)/(0.0821)(300K)} 90. It is the deposition of radiant energy as heat into an absorbing body. a. b. c. d.
Radiation Ionization Convection Insolation
Answer: D 91. It is a process during which the pressure remains constant a. b. c. d.
Adiabatic Isentropic Isobaric Isotropic
Answer: C 92. Diffusion due to thermal motion is called a. b. c. d.
dilation infusion effusion dispersion
Answer: C 93. The rate at which this is quantity passes through a fixed boundary per unit time a. b. c. d.
Flux Existence Irradiance All of these
Answer: D 94. Energy can neither created nor destroyed. It can only change forms. a. b. c. d.
Conservation of Mass Principle Conservation of Energy Principle Conservation of Momentum Principle Conservation of Heat Principle
Answer: B 95. Executes the entire cycle in just two strokes the power stroke and the compression stroke. a. b. c. d.
Answer: B 96. It is the unbalanced force developed in a turbo jet engine that is caused by the difference in the momentum of the low-velocity air entering the engine and the high velocity exhaust gases leaving the engine. a. Fall b. Lift c. Drag d. Thrust Answer: D 97. Which of the engine is used for fighter bombers? a. b. c. d.
Turbojet Pulsejet Rockets Ramjet
Answer: A 98. The Science of Energy a. b. c. d.
Thermionics Kinetics Thermodynamics Geophysics
Answer: C 99. It is used for gas turbines which operates on anopen cycle where both the compression and expansion processes take place in rotating machinery. a. b. c. d.
Dual Cycle Otto Cycle Carnot Cycle Brayton Cycle
Answer: D 100. Which of the following laws of thermodynamic which leads to the definition of entropy? a. b. c. d.
First law Second law Third law Law of conservation of energy
