Thermodynamics Terms PDF

THERMODYNAMICS TERMS 1. Enthalpy of an ideal gas is a function only of_______. 8. The equation Cp= Cv + R applies to which of the A. entropy following? B. internal energy A. Enthalpy C. temperature...

THERMODYNAMICS TERMS 1. Enthalpy of an ideal gas is a function only of_______. 8. The equation Cp= Cv + R applies to which of the A. entropy following? B. internal energy A. Enthalpy C. temperature B. ideal gas D. pressure C. two phase states D. all pure substances 2. Which of the following is the most efficient thermodynamic cycle? 9. In the flow process, neglecting kinetic and potential A. Brayton energies, the integral of Vdp represents what ? B. Otto A. heat transfer C. Carnot B. flow energy D. Diesel C. enthalpy change D. shaft work 3. What is the first law of thermodynamics? A. internal energy is due to molecular motions 10. Mechanical energy of pressure transformed into B. entropy of the universe is increased by energy of heat. irreversible processes A. Kinetic energy C. energy can neither be created nor destroyed B. Enthalpy D. heat energy cannot be completely transformed C. Heat exchanger into work D. Heat of compression 4. An ideal gas is compressed isothermally. What is the 11. The theory of changing heat into mechanical work. enthalpy change? A. Thermodynamics A. always negative B. Kinematics B. always positive C. Inertia C. zero D. Kinetics D. undefined 12. Average pressure on a surface when a changing 5. Name the process that has no heat transfer. pressure condition exist. A. Isothermal A. Back pressure B. Isobaric B. Partial pressure C. Polytropic C. Pressure drop D. Adiabatic D. Mean effective pressure 6. An ideal gas is compressed in a cylinder so well 13. Which of the following cycles consists two isothermal insulated that there is essentially no heat transfer. The and two constant volume processes? temperature of the gas A. Diesel cycle A. Decreases B. Ericsson cycle B. Increases C. Stirling cycle C. remain constant D. Otto cycle D. is zero 14. A control volume refers to what? 7. What is the SI unit of pressure? A. A fixed region in space 𝑘𝑔 A. B. A reversible process 𝑐𝑚2 𝑑𝑦𝑛𝑒𝑠 C. An isolated system B. 𝑐𝑚2 D. A specified mass C. Pascal D. Psi 15. In the polytropic process, PVn = constant, if the value of n is infinitely large, the process is 22. A water temperature of 18 °F in the water cooled A. isobaric condenser is equivalent in °C to _______ B. isometric A. 7.78 C. isothermal B. 10 D. polytropic C. 263.56 D. -9.44 16. If the temperature is held constant and the pressure 23. The latent heat of vaporization in Joules per kg is is increased beyond the saturation pressure, then the equal to _______ working medium must be: A. 5.4 x102 A. compressed liquid B. 4.13 x103 B. subcooled liquid C. 22.6 x105 C. saturated vapor D. 3.35 x105 D. saturated liquid 24. Form of energy associated with the kinetic energy of 17. Is one whose temperature is below the saturation the random motion of large number of molecules. temperature corresponding to its pressure. A. Internal energy A. Superheated vapor B. Kinetic energy B. Wet vapor C. Heat of fusion C. Subcooled liquid D. Heat D. Saturated liquid 25. If the temperature is held constant and the pressure 18. Number of molecules in a mole of any substance is a is increased beyond the saturation pressure, then, the constant called ______. working medium must be: A. Rankine constant A. saturated vapor B. Avogadro's number B. compressed liquid C. Otto constant C. saturated liquid D. Thompson constant D. subcooled liquid 19. If the pressure of a gas is constant the volume directly 26. Is the condition of pressure and temperature at which proportional to the absolute temperature. a liquid and its vapor are indistinguishable. A. Boyle's law A. Critical point B. Joule's law B. Dew point C. Charles’ law C. Absolute humidity D. Kelvin's law D. Relative humidity 20. The number of protons in the nucleus of an atom or 27. When a substance in gaseous state is below the the number of electrons in the orbit of an atom. critical temperature, it is called A. Atomic volume A. vapor B. Atomic number B. cloud C. Atomic weight C. moisture D. Atomic mass D. steam 21. In a P-T diagram of a pure substance, the curve 28. Superheated vapor behaves separating the solid phase from the liquid phase is: A. just as gas A. vaporization curve B. just as steam B. fusion curve C. just as ordinary vapor C. boiling point D. approximately as a gas D. sublimation point 29. Which of the following provides the basis for 36. The sum of the energies of all the molecules in a measuring thermodynamic property of temperature? system where energies appear in several complex form. A. Zeroth law of thermodynamics A. kinetic energy B. First law of thermodynamics B. potential energy C. Second law of thermodynamics C. internal energy D. Third law of thermodynamics D. frictional energy 30. Which of the following is commonly used as liquid 37. The total energy in a compressible or incompressible absorbent? fluid flowing across any section in a pipeline is a function A. Silica gel of B. Activated alumina A. Pressure and velocity C. Ethylene glycol B. Pressure, density and velocity D. None of these C. Pressure, density, velocity and viscosity D. Flow energy, kinetic energy, height above 31. Mechanism designed to lower the temperature of air datum and internal energy passing through it. A. Air cooler 38. The ratio of the density of a substance to the density B. Air defense of some standard substance. C. Air spill over A. Relative density D. Air cycle B. Specific gravity C. Specific density 32. A device for measuring the velocity of wind. D. Relative gravity A. Aneroid barometer B. Anemometer 39. Is one whose pressure is higher than the saturation C. Anemoscope pressure corresponding to its temperature. D. Anemograph A. Compressed liquid B. Saturated liquid 33. Heat normally flowing from a high temperature body C. Saturated vapor to a low temperature body wherein it is impossible to D. Super heated vapor convert heat without other effects: A. first law of thermodynamics 40. The changing of solid directly to vapor without B. second law of thermodynamics passing through the liquid state is called C. third law of thermodynamics A. Evaporation D. zeroth law of thermodynamics B. Vaporization C. Sublimation 34. The temperature at which its vapor pressure is equa D. Condensation the pressure exerted on the liquid. A. Absolute humidity 41. Weight per unit volume is termed as _______. B. Calorimetry A. Specific gravity C. Boiling point B. Density D. Thermal point C. Weight density D. Specific volume 35. A nozzle is used to A. increase velocity and decrease pressure 42. What is the SI unit of force? B. decrease velocity as well as pressure A. Pound C. increase velocity as well as pressure B. Newton D. decrease velocity and increase pressure C. Kilogram D. Dyne 43. The volume of fluid passing a cross-section of steam 50. Exhaust gases from an engine posses: in unit time. A. solar energy A. Steady flow B. kinetic energy B. Uniform flow C. chemical energy C. Discharge D. stored energy D. Continuous flow 51. At critical point the latent enthalpy of vaporization is 44. What equation applies in the first law of A. temperature dependent thermodynamics for an ideal gas in a reversible open B. zero steady-state system? C. minimum A. Q - W = U2 - U1 D. maximum B. Q + VdP = H2 - H1 C. Q - VdP = U2 - U1 52. What is the force which tends to draw a body toward D. Q - PdV = H2 - H1 the center about which it is rotating? A. Centrifugal force 45. A pressure of 1 millibar is equivalent to B. Centrifugal in motion 𝒅𝒚𝒏𝒆𝒔 C. Centrifugal advance A. 1000 𝒄𝒎𝟐 D. Centripetal force B. 1000 cm of Hg C. 1000 psi 𝑘𝑔 53. When a system deviates infinitesimally from D. 1000 𝑐𝑚2 equilibrium at every instant of its state, it is undergoing A. isobaric process 46. When a system deviates infinitesimally from B. quasi - static process equilibrium at every instant of its state, it is undergoing: C. isometric process A. isobaric process D. cyclic process B. quasi-static process C. isometric process 54. A pressure of 1 millibar is equivalent to D. cyclic process 𝒅𝒚𝒏𝒆𝒔 E. 1000 𝒄𝒎𝟐 47. What is the force which tends to draw a body toward F. 1000 cm of Hg G. 1000 psi the center about which it is rotating? 𝑘𝑔 A. Centrifugal force H. 1000 𝑐𝑚2 B. Centrifugal in motion C. Centrifugal advance 55. Work done per unit charge when charged is moved D. Centripetal force from one point to another. A. Equipotential surface 48. What is the process that has no heat transfer? B. Potential at a point A. Reversible isometric C. Electrostatic point B. Isothermal D. Potential difference C. Polytropic D. Adiabatic 56. How many independent properties are required to completely fix the equilibrium state of a pure gaseous 49. Which of the engine is used for fighter bombers? compound? A. Turbojet A. 1 B. Pulsejet B. 2 C. Rockets C. 3 D. Ramjet D. 4 57. Which of the following relations defines enthalpy? 64. What is the equation for the work done by a constant A. h = u + p/T temperature system? B. h = u + pV A. W=mRT In(V2-V1) C. h = u + p/V B. W=mR (T2-T1) In(V2-V1) D. h = pV + T C. W=MRT In (V2-V1) D. W=RT In (V2-V1) 58. Which of the following is true for water at a reference temperature where enthalpy is zero? 65. What is true about the polytropic exponent n for a A. Internal energy is negative perfect gas undergoing an isobaric process? B. Entropy is non - zero A. n >0 C. Specific volume is zero B. n < 0 D. Vapor pressure is zero C. n = ∞ D. n = 0 59. On what plane is the Mollier diagram plotted? A. p - V 66. How does an adiabatic process compare to B. p - T isentropic process? C. h - s A. Adiabatic: Heat transfer = 0, Isentropic: Heat D. h - u transfer = 0 B. Adiabatic: Heat transfer = 0 ,Isentropic: Heat 60. The compressibility factor z, is used for predicting the transfer = 0 behavior of non - ideal gases. How is the compressibility C. Adiabatic: Reversible, Isentropic: Not reversible factor defined relative to an ideal gas? (subscript c refers D. Both: Heat transfer = 0; Isentropic: Reversible to critical value) A. z=P/Pc 67. During an adiabatic, internally reversible process, B. z=PV/RT what is true about the change in entropy? C. z=T/Tc A. It is always zero D. z=(T/Tc)(Pc/P) B. It is always less than zero C. It is always greater than zero 61. How is the quality x of a liquid - vapor mixture define D. It is temperature-dependent A. The fraction of the total volume that is saturated vapor 68. For an irreversible process, what is true about the B. The fraction of the total volume that is saturated change in entropy of the system and surroundings 𝑑𝑞 liquid A. ds = 𝑑𝑡 C. The fraction of the total mass that is saturated B. ds = 0 vapor C. ds > 0 D. The fraction of the total mass that is saturated D. ds < 0 liquid 69. For which type of process does the equation dQ = Tds 62. What is the expression for heat of vaporization? hold? A. hg A. Irreversible B. hf B. Reversible C. hg – hf C. Isobaric D. hf - hg D. Isothermal 63. What is the value of the work done for a closed, reversible, isometric system? 70. Which of the following is true for any process? A. Zero A. △S (Surrounding) + △S (system) > 0 B. Positive B. △S (Surrounding) + AS (system) < 0 C. Negative C. △S (Surrounding) + △S (system) ≤ 0 D. Indeterminate D. △S (Surrounding) + △S (system) ≥ 0 71. Which of the following thermodynamic cycle is the 77. A substance is oxidized when which of the following most efficient? occurs? A. Brayton A. It turns red B. Rankine B. It loses electrons C. Carnot C. It gives off heat D. Otto D. It absorbs energy 72. The ideal reversible Carnot cycle involves four basic 78. Which of the following is not a unit of pressure? processes. What type of processes are they? A. Pa A. All isothermal 𝒌𝒈 B. 𝒎−𝒔 B. All adiabatic C. bars C. All isentropic 𝑘𝑔 D. D. Two isothermal and two isentropic 𝑚2 79. Which of the following is the definition of Joule? 73. What is the temperature difference of the cycle if the A. Newton meter 𝑘𝑔 𝑚 entropy difference is △S, and the work done is W? B. 𝑠2 A. W - △S C. unit of power B. W / △S D. rate of change of energy C. △S / W D. △S - W 80. Which of the following is the basis for Bernoull's for fluid flow? 74. Which of the following is not an advantage of a A. The principle of conservation of mass superheated, closed Rankine cycle over an open Rankine B. The principle of conservation of energy cycle? C. The continuity equation A. Lower equipment cost D. Fourier's law B. Increased efficiency C. Increased turbine life 81. Equation of state for a single component can be any D. Increased boiler life of the following except: A. the ideal gas law 75. Which of the following statements regarding Rankine B. any relationship interrelating 3 or more state cycle is not true? functions A. Use of a condensable vapor in the cycle increases C. relationship mathematically interrelating the efficiency of the cycle thermodynamic properties of the material B. The temperatures at which energy is transferred D. A mathematical expression defining between to and from the working liquid are less separated states interrelating a path than in a Carnot cycle C. Superheating increases the efficiency of a 82. The state of a thermodynamic system is always Rankine defined by its : D. In practical terms, the susceptibility of the A. absolute temperature engine materials to corrosion is not a key B. process limitation on the operating efficiency C. properties D. temperature and pressure 76. Which one of the following is standard temperature 83. In any non quasi-static thermodynamic process, the and pressure (STP) overall entropy of an isolated system will A. 0 °K and 1 atm pressure B. 0 °F and zero pressure A. increase and then decrease C. 32 °F and zero pressure B. decrease and then increase D. 0 °C and 1 atm pressure C. increase only D. decrease only 84. Entropy is the measure of: 91. Equilibrium condition exist in all except which of A. the internal energy of a gas following? B. the heat capacity of a substance A. In reversible processes C. randomness or disorder B. In processes where driving forces infinitesimals D. the change of enthalpy of a system C. In a steady state flow process D. Where nothing can occur without an effect on 85. Which of the following statements about entron8 system's surrounding false? A. Entropy of a mixture is greater than that of its 92. In a closed system (with a moving boundary) which of components under the same condition the following represents work done during isothermal B. An irreversible process increases entropy of process? universe A. W = O C. Net entropy change in any closed cycle is zero B. W = P(V2 – V1) D. Entropy of a crystal at 0 °F is zero 𝑽𝟐 C. W = P1V1 In 𝑽𝟏 𝑃2 𝑉2−𝑃1 𝑉1 D. W = 86. Work or energy can be a function of all of the folle 1−𝑛 except: 93. A substance that exists, or is regarded as existing AS A. force and distance continuum characterized by a low resistance to flow and B. power and time the tendency to assume the shape of its container C. force and time A. Fluid D. temperature and entropy B. Atom C. Molecule 87. Energy changes are represented by all except which D. Vapor one of the following: A. mCpdt 94. A substance that is homogeneous in composition and B. –∫ VdP homogeneous and invariable in chemical aggregation. C. Tds – PdV A. Pure substance 𝒅𝑸 B. Simple substance D. 𝑻 C. Vapor D. Water 88. U + pV is a quantity called: A. shaft work 95. A substance whose state is defined by variable B. entropy intensive thermodynamic properties. C. enthalpy A. Pure substance D. internal energy B. Simple substance C. Vapor 89. In flow process, neglecting KE and PE changes, D. Water ∫vdP represents which item below? 96. A system in which there is no exchange of matter with A. Heat transfer the surrounding or mass does not cross its boundaries. B. Shaft work A. Open system C. Enthalpy change B. Closed system D. Closed system work C. Isolated system D. Nonflow system 90. Power may be expressed in units of 97. A system that is completely impervious to its A. ft – Ib surrounding or neither mass nor energy cross its B. kw – hr boundaries. C. Btu A. Open system 𝑩𝒕𝒖 D. B. Closed system 𝒉𝒓 C. Isolated system D. Nonflow system 98. A system in which there is a flow of mass across its 105. The mass per unit volume of any substance. boundaries. A. Density A. Open system B. Specific volume B. Closed system C. Specific weight C. Isolated system D. Specific gravity D. Steady flow system 106. The force of gravity on unit volume is 99. The properties that are dependent upon the mass of A. density the system and are total values such as total volume a B. specific volume total internal energy. C. specific weight A. Intensive properties D. specific gravity B. Extensive properties C. Specific properties 107. The reciprocal of density is D. State properties A. specific volume B. specific weight 100. The properties that are independent of the mas the C. specific gravity system such as temperature, pressure, den and voltage. D. specific heat A. Intensive properties B. Extensive properties 108. Avogadro's number, a fundamental constant of C. Specific properties nature, is the number of molecules in a gram-mole. This D. State properties constant is A. 6.05222 X 1023 101. The properties for a unit mass and are intensive by B. 6.02252 X 1023 definition such as specific volume. C. 6.20522 X 1023 A. Intensive properties D. 6.50222 X 1023 B. Extensive properties C. Specific properties 109. The ratio of the gas constant to Avogadro's number D. Thermodynamic properties is: A. Maxwell's constant 102. The condition as identified through the properties B. Boltzmann'z constant of the substance, generally defined by particular values C. Napier's constant of any two independent properties. D. Joule's constant A. State B. Point 110. The absolute zero on the Fahrenheit scale is at C. Process A. -459.7 °F D. flow B. 459.7 °F C. -273.15 ℃ 103. The only base unit with a prefix kilo is D. 273.15 ℃ A. kilogram 111. Absolute temperatures on the Fahrenheit scale are B. kilometer called: C. kiloJoule A. degrees Rankine D. kilopascal B. degrees Kelvin C. absolute Fahrenheit 104. The force of gravity on the body. D. absolute Celsius A. Weight 112. The absolute zero on the Celsius scale is at B. Specific gravity A. -459.7 °F C. Attraction B. 459.7 °F D. Mass C. -273.15 ℃ D. 273.15 °C. 113. What is the absolute temperature in celsius scale 120. The solid - liquid equilibrium of Tin is at what A. degrees Rankine temperature? B. degrees Kelvin A. -38.87 °C C. absolute Fahrenheit B. 38.87 °C D. absolute Celsius C. 231.9 °C D. -231.9 °C 114. The Fahrenheit scale was introduced by Gabriel 121. The solid - liquid equilibrium of Zinc is at what Fahrenheit of Amsterdam, Holland in what year temperature? A. 1592 A. 231.9 °C B. 1742 B. 419.505 °C C. 1730 C. 444.60 °C D. 1720 D. 630.5 °C 115. The Centigrade scale was introduced by Anders 122. The liquid-vapor equilibrium of Sulfur is at what Celsius in what year? temperature? A. 1542 A. 231.9 °C B. 1740 B. 419.505 °C C. 1730 C. 444.60 °C D. 1720 D. 630.5 ℃ 116. The National Bureau of Standards uses, among 123. The solid - liquid equilibrium of Antimony is at what others, the liquid -vapor equilibrium of hydrogen at temperature? A. -196 ℃ A. 630.5 °C B. 196 ℃ B. 419.505 °C C. 253 °C C. 444.60 °C D. -253 °C D. 231.9 °C 117. The National Bureau of Standards uses, among 124. The solid - liquid equilibrium of silver is at what others, the liquid - vapor equilibrium of Nitrogen at temperature? A. -196 ℃ A. 630.5 °C B. 196 ℃ B. 960.8 ℃ C. 253 ℃ C. 1063 °C D. -253 ℃ D. 1774 °C 118. The liquid - vapor equilibrium of Oxygen is at what 125. The solid - liquid equilibrium of Gold is at what temperature? temperature? A. 197.82 ℃ A. 630.5 ℃ B. -197.82 °C B. 960.8 °C C. 182.97 ℃ C. 1063 °C D. -182.97 ℃ D. 1774 °C 119. The solid - liquid equilibrium of Mercury is at what 126. The solid - liquid equilibrium of Platinum is at what temperature? temperature? A. 38.87 °C A. 630.5 °C B. -38.87 °C B. 960.8 ℃ C. 37.88 °C C. 1063 °C D. -37.88 °C D. 1774 °C 127. The solid - liquid equilibrium of Tungsten is at what 134. When a certain mass of fluid in a particular state temperature? passes through a series of processes and retumn its to A. 3730 ℃ initial state, it undergoes a. B. 3370 ℃ A. revolution C. 3073 °C B. rotation D. 3037 ℃ C. process D. cycle 128. The device that measures temperature the electromotive force. 135. The term given to the collection of matter A. thermometer consideration enclosed within a boundary. B. thermocouple A. System C. electro-thermometer B. Matter D. thermoseebeck C. Environment 129. The emf is a function of the temperature difference D. Atoms between the junction, a phenomenon called: A. Seebeck effect 136. The region outside the boundary or the space and B. Stagnation effect matter external to a system: C. Primming A. Ex- system D. Electromotive force B. Surrounding C. Matter 130. The device that measure temperature by D. Extension electromotive force called thermocouple was discovered by: 137. The true pressure measured above a perfect A. Galileo vacuum. B. Fahrenheit A. Absolute pressure C. Celsius B. Gage pressure D. Seebeck C. Atmospheric pressure 131. When two bodies, isolated from other environment, D. Vacuum pressure are in thermal equilibrium with a third body, the two are 138. The pressure measured from the level of in thermal equilibrium with each other. atmospheric pressure by most pressure recording A. Zeroth law of thermodynamics instrument like pressure gage and open-ended B. First law of thermodynamics manometer. C. Second law of thermodynamics A. Gage pressure D. Third law of thermodynamics B. Atmospheric pressure C. Barometric pressure 132. The total entropy of pure substances approaches D. Absolute pressure zero as the absolute thermodynamic temperature approaches zero. 139. The pressure obtained from barometric reading A. Zeroth law of thermodynamics A. Absolute pressure B. First law of thermodynamics B. Gage pressure C. Second law of thermodynamics C. Atmospheric pressure D. Third law of thermodynamics D. Vacuum pressure 133. If any one or more properties of a system change 140. It is a form of energy associated with the kinetic system is said to have undergone a ______. random motion of large number of molecules. A. cycle A. Internal energy B. process B. Kinetic energy C. flow C. Heat D. control D. Enthalpy 141. The heat needed to change the temperature of the 148. In a confined gas if the absolute pressure is held body without changing its phase. constant the volume is directly proportional to the A. Latent heat absolute temperature. B. Sensible heat A. Boyle's law C. Specific heat B. Charles’ law D. Heat transfer C. Dalton's law D. Avogadro's law 142. The heat needed by the body to change its phase without changing its temperature. 149. The pressure exerted in a vessel by a mixture of A. Latent heat gases is equal to the sum of the pressures that each B. Sensible heat separate gas would exert if it alone occupied the whole C. Specific heat volume of the vessel. D. Heat transfer A. Boyle's law B. Charles’ law 143. The measure of the randomness of the molecules of C. Dalton's law a substance. D. Avogadro's law A. Enthalpy B. Internal energy 150. At equal volume, at the same temperature and C. Entropy pressure conditions, the gases contain the same number D. Heat of molecules. A. Boyle's law 144. The heat energy transferred to a substance at a B. Charles’ law constant pressure process is :__________ C. Dalton's law A. enthalpy D. Avogadro's law B. heat internal C. energy 151. A process in which the system departs from D. entropy equilibrium state only infinitesimally at every instant. A. Reversible process 145. It is the energy stored within the body. B. Irreversible process A. Enthalpy C. Cyclic process B. Heat D. Quasi-static process C. Internal energy D. Entropy 152. A process which gives the same states/conditions after the system undergoes a series of processes : 146. A theoretically ideal gas which strictly follows A. Reversible process Boyle's law and Charle's law of gases. B. Irreversible process A. Universal gas C. Cyclic process B. Perfect gas D. Quasi-static process C. Combined gas D. Imperfect gas 153. A thermodynamic system that generally serves as a heat source or heat sink for another system. 147. In a confined gas, if the absolute temperature is held A. Combustion chamber constant, the volume is inversely proportional to the B. Heat reservoir absolute pressure. C. Heat engine A. Boyle's law D. Stirling engine B. Charles law C. Dalton's law D. Avogadro's law 154. A thermodynamic system that operates 160. A heat exchange process where in the product of continuously with only energy (heat and work) crossing pressure and volume remains constant called: its boundaries; its boundaries are impervious to the flow A. heat exchange process of mass. B. isentropic process A. Heat engine C. throttling process B. Steady flow work D. hyperbolic process C. Stirling engine D. Ericsson engine 161. Which of the following provides the basis for measuring thermodynamic property of temperate? 155. A surface that is impervious to heat is A. Zeroth law of thermodynamics A. isothermal surface B. First law of thermodynamics B. adiabatic surface C. Second law of thermodynamics C. isochoric surface D. Third law of thermodynamics D. isobaric surface 162. 1 watt... A. 1 Nm/s 156. One of the consequences of Einstein's theory of B. 1 Nm/min relativity is that mass may be converted into energy and C. 1 Nm/hr energy into mass, the relation being given by the famous D. 1 kNm/hr equation, E = mc². What is the value of speed of light c? 𝑐𝑚 A. 2.7797 x 1010 𝑠 163. Under ideal conditions, isothermal, isobaric, 𝒄𝒎 isochoric and adiabatic processes are : B. 2.9979 x 1010 𝒔 A. dynamic processes 10 𝑐𝑚 C. 1.7797 x 10 𝑠 B. stable processes 𝑐𝑚 D. 2.9979 x 1010 C. quasi-static processes 𝑠 D. static processes 157. In the polytropic process we have pvn= constant 164. Isentropic flow is the value of n is infinitely large, the process is called A. perfect gas flow A. constant volume process B. irreversible adiabatic flow B. constant pressure process C. ideal fluid flow C. constant temperature process D. reversible adiabatic flow D. adiabatic process 165. Exhaust gases from an engine possess 158. The thermodynamic cycle used in a thermal power A. solar energy plant is : B. kinetic energy A. Ericsson C. chemical energy B. Brayton D. stored energy C. Joule D. Rankine 166. The extension and compression of a helical spring is an example of what process? 159. For the same heat input and same compression ratio A. isothermal cycle A. both Otto cycle and Diesel cycle are equally B. thermodynamic process efficient C. adiabatic process B. Otto cycle is less efficient than diesel cycle D. reversible process C. efficiency depends mainly on working substance 167.At critical point the latent enthalpy of vaporization is D. none of the above is correct A. dependent on temperature B. zero C. minimum D. maximum 168. Which of the following relations is not applicable in 174. "It. is impossible to construct a heat engine that a free expansion process? operates in a cycle and receives a given quantity of heat A. Heat supplied is zero from a high temperature body and does an equal amount B. Heat rejected is zero of work" The above statement is known as : C. Work done is zero A. Gay Lussac's law D. Change in temperature is zero B. Kinetic Theory C. Kelvin - Planck's law 169. The triple point of a substance is the temperature D. Joule -Thomson's law and pressure at which: A. the solid and liquid phases are in equilibrium 175. For steam nozzle, which of the following ratio will B. the liquid and gaseous phases are in equilibrium have the value less than unity? C. the solid, liquid and the gaseous phases are in A. (Pressure at inlet)/(Pressure at outlet) equilibrium B. Specific volume at inlet/(Specific volume at D. the solid does not melt, the liquid does not boil outlet) and the gas does not condense C. Temperature of steam at inlet/(Temperature of steam at outlet) 170. According to Clausius statement D. None of the above A. Heat flows from hot substance to cold substance, unaided 176. A Bell-Coleman cycle is a reversed B. Heat cannot flow from cold substance to hot A. Stirling cycle substance B. Brayton cycle C. Heat can flow from cold substance to hot C. Joule cycle substance with the aid of external work D. Carnot cycle D. A and C 177. Ericsson cycle consists of the following 171. A heat engine is supplied heat at rate of 30,000 J/s processes gives an output of 9 kW. The thermal efficiency of the A. two isothermal and two constant volume engine is ______. B. two isothermal. and two constant isentropic A. 30% C. two isothermal and two constant pressure B. 43% D. two adiabatic and two constant pressure C. 50% D. 55% 178. A steam nozzle changes A. kinetic energy into heat energy 172. The RMS velocity of hydrogen gas at N.T.P. is B. heat energy into potential energy approximately ______. C. potential energy into heat energy A. 3838 m/s D. heat energy into kinetic energy B. 1839 m/s C. 4839 m/s 179. Which is not correct for calculating air standard D. 839 m/s efficiency? A. All processes are reversible 173. Which of the following cycles has two isothermal B. Specific heat remains unchanged at all and two constant volume processes? temperatures A. Joule cycle C. No account of the mechanism of heat transfer is B. Diesel cycle considered C. Ericsson cycle D. Gases dissociate at higher temperatures D. Stirling cycle 180. According to Pettlier Thomson effect: A. It is impossible to construct a heat engine that 186. Solubility of a gas in a liquid at small concentration operates in a cycle and receives a given quantity can be represented by which law ? of heat from a high temperature body and does A. Henry's law an equal amount of work B. Clausius – Clapeyron's equation B. It is impossible to construct a device that C. Dalton's law operates in a cycle and produces no effect other D. Roult's law than the transfer of heat from a cooler body to hotter body 187. A compound pressure gauge is used to measure: C. When two dissimilar metals are heated at one A. complex pressures end and cooled at other, e.m.f. that is developed B. variable pressures is proportional to difference of temperatures at C. average pressures two ends D. positive and negative pressures D. Work can’t be converted into heat 181. In actual gases the molecular collisions are : 188. Which of the engine is used for fighter bomber? A. plastic A. Turboprop B. elastic B. Turbojet C. inelastic C. Ramjet D. inplastic D. Pulsejet 182. The Beattie-Bridgeman equation of state is quite 189. The thermal efficiency of gas-vapor cycle as accurate in cases of: compared to steam turbine or gas turbine A. all pressures above atmospheric pressure A. greater than B. densities less than about 0.8 times the critical B. less than density C. not comparable C. near critical temperature D. equal D. none of the above 190. The process in which heat energy is transferred to 183. Which of the following statement about Van der thermal energy storage device is known as: Waals equation is correct? A. adiabatic A. It is valid for all pressures and temperatures B. regeneration B. It represents a straight line on PV versus V plot C. intercooling C. It has three roots of identical value at the critical D. heat transfer point D. The equation is valid for diatomic gases only 191. The absolute zero in Celsius scale is: A. 100 184. The Clapeyron's equation is applicable to : B. 0 A. 1 system in equilibrium C. -273 B. a change of state D. 273 C. a change of state when two phases are in equilibrium 192. What is the temperature when water and vapor are D. a change of state when water and water vapor in equilibrium with the atmospheric pressure? are involved A. Ice point 185. The vapor pressure is related to the enthalpy of B. Steam point vaporization by the: C. Critical point A. Clausius - Claypeyron's equation D. Freezing point B. Dalton's law C. Raoult's law D. Maxwell's equation 193. The temperature of a pure substance at a 199. A graph of enthalpy versus entropy for steam. temperature of absolute zero is : A. Mollier diagram A. unity B. Moody diagram B. zero C. Steam table C. infinity D. Maxwell diagram D. 100 200. The reaction of inertia in an accelerated body is 194. When the number of reheat stages in a reheat cycle called is increased, the average temperature: A. Kinetic reaction A. increases B. Endothermic reaction B. decreases C. Kinematic reaction C. is constant D. Dynamic reaction D. is zero 201. A Mollier chart of thermodynamic properties is 195. A temperature measurement in an ordinary shown in which of the following diagrams? thermometer which has constant specific humidity A. T-S diagram A. Critical temperature B. P-V diagram B. Dew point temperature C. h-S diagram C. Dry bulb temperature D. p-h diagram D. Wet bulb temperature 202. The following are included in the first law of 196. In a closed vessel, when vaporization takes place thermodynamics for closed system EXCEPT: temperature rises. Due to the rising temperature, the A. heat transferred in and of the system pressure increases until an equilibrium is established B. work done by or on the system between the temperature and pressure. The C. internal energy temperature of equilibrium is called: D. kinetic energy A. dew point B. ice point 203. All processes below are irreversible except one. C. superheated temperature Which one? D. boiling point A. Magnetization with hysteresis B. Elastic tension and release of a steel bar 197. When hot soup was served in a cup during dinner an C. Inelastic deformation engineer was so eager to drink it. Since it was hot, he D. Heat conduction added cubes of ice to cool the soup and stirred it. He noticed that dew starts to form on the outer surface of 204. The combination of conditions that best describe a the cup. What is this temperature equal to thermodynamic process is given by which of the A. superheated temperature following? B. equal to zero I. Has successive states through which the system passes C. standard temperature II. When reversed leaves no change in the system D. equal to air's dew point temperature III. When reversed leaves no change in the system or the surroundings 198. Is a measure of the energy that is no longer available IV. States are passes through so quickly that the to perform useful work within the current environment. surroundings do not change A. Absolute entropy A. I and II B. Absolute enthalpy B. I and III C. Fugacity C. I and IV D. Molar value D. I only 205. The sum of the energies of all the molecules in a 212. Which of the following statements about a path system where energies appear in several complex forms function is not true? is the: A. On a p- v diagram, it can represent work done A. kinetic energy B. On a t - s diagram, it can represent heat B. potential energy transferred C. internal energy C. It is dependent on the path between states of D. frictional energy thermodynamic equilibrium D. It represents values of p, v, t, and s between 206. The Carnot refrigeration cycle includes all of the states that are path functions following process except : A. isentropic expansion 213. A constant pressure thermodynamic process obeys: B. isothermal heating A. Boyle's law C. isenthalpic expansion B. Charles law D. isentropic compression C. Amagat's law D. Dalton's law 207. The maximum possible work that can be obtained a cycle operating between two reservoirs is found from 214. The first and second laws of thermodynamics are A. process irreversibility A. continuity equations B. availability B. momentum equations C. Carnot efficiency C. energy equations D. Reversible work D. equations of state 208. The following factors are necessary to define 215. Represents the temperature an ideal gas will attain thermodynamic cycle except when it is brought to rest adiabatically. A. the working substance A. Absolute zero temperature B. high and low temperature reservoirs B. Stagnation temperature C. the time it takes to complete the cycle C. Boiling temperature D. the means of doing work on the system D. Critical temperature 209. All of the following terms included in the second law 216. Gauge pressure and absolute pressure dife for open system except each other by: A. shaft work A. the system units B. flow work B. atmospheric pressure C. internal energy C. the size of the gauge D. average work D. nothing they mean the same thing 210. The following terms are included in the first law of 217. Each of the following are correct values of standard thermodynamics for open systems except atmospheric pressure except: A. heat transferred in and out of the system A. 1,000 atm B. work done by or in the system B. 14.962 psia C. magnetic system C. 760 torr D. internal system D. 1013 mm Hg. 211. The following terms are included in the first law of 218. All of the following are properties of an ideal gas thermodynamics for closed systems except: except: A. heat transferred in and out of the system A. density B. work done by or on the system B. pressure C. internal energy C. viscosity D. kinetic energy D. temperature 219. Which of the following is not the universal gas 226. During stagnation process, the kinetic energy of a constant? fluid is converted to enthalpy which results in an: A. 1545 ft-lb/lbmol-°R A. increase in the fluid specific volume B. 8.314 J/mol.K B. increase in the fluid pressure C. 8314 kJ/mol. K C. increase in the fluid temperature and pressure D. 8.314 kJ/kmol.K D. increase in the fluid temperature 220. The following are all commonly quoted values of 227. The properties of fluid at the stagnation in state are standard temperatures and pressure except: called______ A. 32°F and 14.696 psia A. stagnation property B. 273.15 K and 101.325 kPa B. stagnation phase C. 0°C and 760 mm Hg C. stagnation state D. 0°F and 29.92 in Hg D. stagnation vapor 221. The variation of pressure in an isobaric process is: 228. All of the following are thermodynamic properties A. linear with temperature except______ B. described by the perfect gas law A. temperature C. inversely proportional to temperature B. pressure D. zero C. density D. modulus of elasticity 222. For fluid flow, the enthalpy is the sum of internal energy and _____. 229. A liquid boils when its vapor pressure equals A. entropy A. the gage pressure B. work flow B. the critical pressure C. pressure C. the ambient pressure D. temperature D. one standard atmosphere 223. A thermodynamic process whose deviation from 230. A system composed of ice and water at 0°C is said to equilibrium is infinitesimal at all times is _____. be: _______ A. reversible A. a multiphase material B. isentropic B. in thermodynamic equilibrium C. in quasi - equilibrium C. in thermal equilibrium D. isenthalpic D. all of the above 124. Which thermodynamic property best describes the 231. The heat of fusion of a pure substance is: molecular activity of a substance? A. the change in phase from solid to gas A. Enthalpy B. the change in phase from liquid to gas B. Entropy C. the energy released in a chemical reaction C. Internal energy D. the energy required to melt the substance D. External energy 225. Stagnation enthalpy represents the enthalpy of a 232. The heat of vaporization involves the change in fluid when it is brought to rest ________ enthalpy due to: A. isometrically A. the change in phase from solid to gas B. adiabatically B. the change in phase from liquid to gas C. isothermally C. the energy released in a chemical reaction D. disobarically D. the change in phase from solid to liquid 233. The heat of sublimation involves the change in 240. For a saturated vapor, the relationship between enthalpy due to _________. temperature and pressure is given by: A. the change in phase from solid to gas A. the perfect gas law B. the change in phase from liquid to gas B. Van der Waal's equation C. the energy released in a chemical reaction C. the steam table D. the change in phase from solid to liquid D. a Viral equation of state 234. A specific property 241. Properties of a superheated vapor are given by A. defines a specific variable (e.g., temperature) A. the perfect gas law B. is independent of mass B. a superheated table C. is an extensive property multiplied by mass C. a one to one relationship, such as the properties D. is dependent of the phase of the substance of saturated steam 235. A material's specific heat can be defined as D. a Viral equation of state A. the ratio of heat required to change the temperature of mass by a change in temperature 242. Properties of non-reacting gas mixtures are given by B. being different for constant pressure constant A. geometric weighting temperature processes B. volumetric weighting C. all function of temperature C. volumetric weighting for molecular weight and D. all of the above density, and geometric weighting for all other properties except entropy 236. If a substance temperature is less than its saturation D. arithmetic average temperature, the substance is : A. subcooled liquid 243. The relationship between the total volume of a B. wet vapor mixture of non-reacting gases and their partial volume C. saturated vapor given by : D. superheated vapor A. gravimetric fractions 237. If a substance temperature is equal to its saturation B. Amagat's law temperature, the substance is a ______ C. Dalton's law A. subcooled liquid D. mole fractions B. wet vapor C. saturated liquid and vapor 244. The relationship between the total pressure of a D. superheated vapor mixture of non-reacting gases and the partial pressures 238. If a substance's temperature is greater than its of constituents is given by : saturation temperature, the substance is a ______ A. gravimetric fractions A. subcooled liquid B. volumetric fractions B. wet vapor C. Dalton's law C. saturated vapor D. mole fractions D. superheated vapor 245. Which of the following is the best definition of 239. Critical properties refer to enthalpy? A. extremely important properties, such as A. The ratio of heat added to the temperature temperature and pressure. increases in a system B. heat required for phase change and important B. The amount of useful energy in a system for energy production C. The amount of energy no longer available to the C. property values where liquid and gas phase are system indistinguishable D. The heat required to cause a complete D. properties having to do with equilibrium conversion between two phases at a constant conditions, such as the Gibbs and Helmholtz temperature functions. 246. Which of the following statements is not true for 253. Adiabatic heat transfer within a vapor cycle refers real gases? to: A. Molecules occupy a volume not negligible in A. heat transfer that is atmospheric but not comparison to the total volume of gas reversible B. Real gases are subjected to attractive forces B. the transfer of energy from one stream to between molecules (e.g., Van der Waal's forces) another in a heat exchanger so that the energy C. The law of corresponding states may be used for of the input streams equals the energy of the real gases output streams D. Real gases are found only rarely in nature C. heat transfer that is reversible but not isentropic D. there is no such thing as adiabatic heat transfer 247. The stagnation state is called the isentropic stagnation state when the stagnation process is: 254. Which of the following gives polytropic under n? 𝑷𝟐 A. reversible as well dynamic 𝐥𝐨𝐠 𝑷𝟏 A. 𝑽𝟐 B. isotropic 𝐥𝐨𝐠 𝑽𝟏 C. adiabatic log 𝑃1 𝑃2 D. reversible as well as adiabatic B. 𝑉1 log 𝑉2 𝑉1 log 𝑉2 248. The entropy of a fluid remains constant during what C. 𝑃2 log 𝑃1 process? 𝑉1 log 𝑉2 A. polytropic stagnation process D. 𝑃1 log 𝑃2 B. unsteady stagnation process C. combustion process 255. The work done in an adiabatic process in a system: D. isentropic stagnation process A. is equal to the change in total energy in a closed system 249. All of the following processes are irreversible except B. is equal to the total net heat transfer plus the A. stirring of a viscous fluid entropy change B. an isentropic deceleration of a moving perfect C. is equal to the change in total energy of closed fluid system plus the entropy change C. an unrestrained expansion of a gas D. is equal to the change in total energy of closed D. phase changes system plus net heat transfer 250. All of the following processes are irreversible except 256. Based on the first law of thermodynamics, which of A. chemical reactions the following is wrong? B. diffusion A. The heat transfer equals the work plus energy C. current flow through an electrical resistance change D. an isentropic compression of a perfect gas B. The heat transfer cannot exceed the work done C. The net transfer equal the net work of the cycle 251. All of the following processes are irreversible except D. The net heat transfer equals the energy change if A. magnetization with hysteresis no work is done B. elastic tension and release of a steel bar C. inelastic deformation 257. Assuming real processes, the net entropy change in D. heat conduction the universe: A. must be calculated 252. Which of the following state(s) is/are necessary for B. equals zero a system to be in thermodynamic equilibrium? C. is negative A. Chemical equilibrium D. is positive B. Thermal equilibrium C. Mechanical equilibrium D. Chemical, mechanical, and thermal equilibrium 258. Which of the following types of flowmeters is most 265. The elongation and compression of a helical spring accurate? is an example of A. Venturi tube A. irreversible process B. Pitot tube B. reversible process C. Flow nozzle C. isothermal process D. Foam type D. adiabatic process 259. What is referred by control volume? 266. Otto cycle consists of A. An isolated system A. Two isentropic and two constant volume B. Closed system processes C. Fixed region in space B. Two isentropic and two constant pressure D. Reversible process only processes C. Two adiabatic and two isothermal processes 260. What is the most efficient thermodynamic cycle? D. Two isothermal and two constant volume A. Carnot processes B. Diesel C. Rankine 267. Brayton cycle has D. Brayton A. Two isentropic and two constant volume processes 261. How do you treat a statement that is considered a B. Two isentropic and two constant pressure scientific law? processes A. We postulate to be true C. One constant pressure, one constant volume and B. Accept as a summary of experimental two adiabatic processes observation D. Two isothermal, one constant volume and one C. We generally observed to be true constant pressure processes D. Believe to be derived from mathematical theorem 268. A Bell-Coleman cycle is a reversed A. Stirling cycle 262. An instrument commonly used in most research B. Joule cycle and engineering laboratories because it is small and fast C. Carnot cycle among the other thermometers D. Otto cycle A. Mercury thermometer B. Liquid-in-glass thermometer 269. A steam nozzle changes C. Gas thermometer A. kinetic energy into heat energy D. Thermocouple B. heat energy into potential energy C. heat energy into kinetic energy 263. In an actual gases, the molecular collisions are D. potential energy into heat energy A. plastic B. elastic 270. The pitot tube is a device used for measurement of C. inelastic A. pressure D. inplastic B. flow C. velocity 264. Which of the following is used in thermal power D. discharge plant? A. Brayton 271. The continuity equation is applicable to B. Reversed Carnot A. Viscous, unviscous fluids C. Rankine B. Compressibility of fluids D. Otto C. Conservation of mass D. Steady, unsteady flow 272. The work done by a force of R Newtons moving in a 278. What condition exists in an adiabatic throttling distance of L meters is converted entirely into kinetic process? energy and expressed by the equation: A. Enthalpy is variable A. RL=2MV² B. Enthalpy is constant B. RL=2MV C. Entropy is constant 𝟏 D. Specific volume is constant C. RL= 𝟐 𝐌𝐕2 1 D. RL= MV 2 279. The specific gravity of a substance is the ratio of its density to the density of: 273. Gas being heated at constant volume is undergoing A. mercury the process of: B. gas A. isentropic C. air B. adiabatic D. water C. isometric D. isobaric 280. A compound pressure gauge is used to measure: A. complex pressures 274. Dew point is defined as B. variable pressures A. The temperature to which the air must be C. compound pressures cooled at constant pressure to produce D. positive and negative pressures saturation B. The point where the pressure and temperature 281. Isentropic flow is lines meet A. perfect gas flow C. The temperature which dew is formed in the air B. ideal fluid flow D. The pressure which dew is formed in the air C. frictionless reversible flow D. reversible adiabatic flow 275. What do you call the changing of an atom of element into an atom of a different element with a 282. Under ideal conditions, isothermal, isobaric, different atomic mass? isochoric, and adiabatic processes are: A. Atomization A. dynamic processes B. Atomic transmutation B. stable processes C. Atomic pile C. quasi-static processes D. Atomic energy D. static processes 276. What do you call the weight of the column of air 283. One Watt is: above the earth's surface? 𝐍.𝐦 A. 1 𝐬 A. Air pressure N.m B. Aerostatic pressure B. 1 min C. Wind pressure N.m C. 1 hr D. Atmospheric pressure kN.m D. 1 s 277. What keeps the moisture from passing through the system? 284. A temperature above which a given gas cannot be A. Dehydrator liquefied: B. Aerator A. Cryogenic temperature C. Trap B. Vaporization temperature D. Humidifier C. Absolute temperature D. Critical temperature 285. The effectiveness of a body as a thermal radiator at 292. Ericsson cycle has a given temperature. A. Two isothermal and two constant pressure A. Absorptivity processes. B. Emissivity B. Two isothermal and two constant volume C. Conductivity processes. D. Reflectivity C. Two isothermal and two constant entropy processes. 286. Which of the following occurs in a reversible D. Two adiabatic, one constant volume and polytropic process? constant pressure processes A. Enthalpy remains constant B. Internal energy does not change 293. A Stirling cycle has C. Some heat transfer occurs A. Two adiabatic processes and two constant D. Entropy remains constant volume processes B. Two adiabatic and two constant pressure 287. The instrument used to measure atmospheric processes pressure is: C. Two isothermal and two constant pressure A. Rotameter processes B. Manometer D. Two isothermal and two constant volume C. Venturi processes D. Barometer 294. The temperature of the fluid flowing under pressure 288. A pneumatic tool is generally powered by through a pipe is usually measured by: A. water A. a glass thermometer B. electricity B. an electric resistance thermometer C. steam C. a thermocouple D. air D. all of the above 89. Which of the following gases can be used to measure 295. Specific heat capacity is an SI derived unit described the lowest temperature? J A. kg A. Nitrogen I B. Helium B. mk 𝐤𝐉 C. Oxygen C. 𝐤𝐠𝐊 D. Hydrogen J D. m 90. The triple point of a substance is the temperature and pressure at which: 296. Which of the following is mathematically a A. The solid and liquid phases are in equilibrium thermodynamic property? B. The solid and gaseous phases are in equilibrium A. A point function C. The solid, liquid and gaseous phases are in B. Discontinuous equilibrium C. A path function D. The solid does not melt, the liquid does not boil D. Exact differential and the gas does not condense 297. When the expansion or compression of gas takes 291. Which of the following relations is not applicable in place "without transfer of heat" to or from the gas, the a free expansion process? process is called: A. Heat rejected is zero A. reversible B. Work done is zero B. adiabatic C. Change in temperature is zero C. polytropic D. Heat supplied is zero D. isothermal 298. Another name for the liquid valve is. 305.PAST ME BOARD QUESTION A. Freon valve In the absence of any irreversibilities, a thermoelectric B. Shut-off valve generator, a device that incorporates both thermal and C. King valve electric effects, will have the efficiency of a/an D. Master valve A. Carnot cycle B. Otto cycle 299. A liquid whose temperature is lower than the C. Diesel cycle saturation temperature corresponding to the existing D. Rankine cycle pressure: A. Subcooled liquid 306. Both Stirling and Ericson engines are B. Saturated liquid A. internal combustion engines C. Pure liquid B. external combustion engines D. Compressed liquid C. Carnot engines D. Brayton engines 300. The law that states "Entropy of all perfect crystalline solids is zero at absolute zero temperature: 3O7. Nozzles does not involve any work interaction. The A. Zeroth law of thermodynamics fluid through this device experiences: B. First law of thermodynamics A. no change in potential energy C. Second law of thermodynamics B. no change in kinetic energy D. Third law of thermodynamics C. no change in enthalpy D. vacuum 301. What should be the temperature of both water and steam whenever they are present together? 308. If the actual kinetic energy of a nozzle is Ka and Ki is A. Saturation temperature for the existing the maximum value that can be attained by an isentropic pressure expansion from an initial to final state, then the efficiency B. Boiling point of water at 101.325 kPa of the nozzle is: C. Superheated temperature 𝐾𝑖 A. 𝐾𝑎 D. One hundred degrees centigrade 𝐾𝑎−𝐾𝑖 B. 𝐾𝑎 𝐾𝑎−𝐾𝑖 302. A manometer is an instrument that is used to C. 𝐾𝑖 measure: 𝑲𝒂 D. 𝑲𝒊 A. air pressure B. heat radiation 309. The convergent section of a nozzle increases the C. condensate water level velocity of the flow of the gas. What does it to do on its D. air volume pressure? A. Pressure becomes constant 303. What is the area under the curve of a temprature- B. Pressure equals the velocity entropy diagram? C. It increases the pressure A. Volume D. It decreases the pressure B. Heat C. Work 310. In a closed vessel, when vaporization takes place, D. Entropy the temperature rises. Due to the rising temperature, pressure increases until an equilibrium is established 304. What do bodies at a temperature above absolute between the temperature and pressure. The zero emit? temperature of equilibrium is called ________. A. Energy A. dew point B. Heat of convection B. ice point C. Thermal radiation C. boiling point D. Heat of compression D. superheated temperature 311. At steam point, the temperatures of water and its 317. What is the area under the curve of a pressure- vapor at standard pressure are: volume diagram? A. extremes or maximum A. Nonflow work B. unity B. Steadyflow work C. in equilibrium C. Heat D. undefined D. Power 312. When hot soup was served in a cup during dinner, 318. In Stirling and Ericson cycle, regeneration can g an engineer was so eager to drink it. Since it was hot, he A. increase efficiency added cubes of ice to cool the soup and stirred it. He B. decrease efficiency noticed that dew starts to form on the outermost surface C. control efficiency of the cup. He wanted to check the temperature of the D. limit efficiency outermost surface of the cup. What is this temperature equal to? 319. The first law of thermodynamics is based on which A. Superheated temperature of the following principles? B. Equal to zero A. Conservation of mass C. Standard temperature B. Enthalpy-entropy relationship D. Equal to air's dew point temperature C. Entropy-temperature relationship D. Conservation of energy 313. What do you call a conversion technology that yields electricity straight from sunlight without the aid of a 320. In a two-phase system, 30% moisture means working substance like gas or steam without the use of A. 70% liquid and 30% vapor any mechanical cycle? B. 70% vapor and 30% liquid A. Power conversion C. 30% liquid and 100% vapor B. Stirling cycle conversion D. 30% vapor and 100% liquid C. Solar thermal conversion D. Photovoltaic-energy conversion 321. At 101.325 kPa, the boiling point of water is 100 °C the pressure is decreased, the boiling temperature will: 314. Which of the following property of liquid extend A. increase resistance to angular or shear deformation: B. decrease A. Specific gravity C. remain the same B. Specific weight D. drop to zero C. Viscosity D. Density 322. Which of the following is equivalent to 1 hp in Btu/hr A. 778 315: What is the pressure at the exit of a draft tube in a B. 2545 turbine?