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Q 1/330
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1. Enthalpy of an ideal gas is a function only of ________
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B. Internal energy
D. Pressure
C. Temperature
A. Entropy
Q 2/330
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2. Which of the following is the most efficient thermodynamic cycle?
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B. Otto
D. Diese
C. Carnot
A. Brayton
330 questions
Q.
1. Enthalpy of an ideal gas is a function only of ________
1
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Q.
2. Which of the following is the most efficient thermodynamic cycle?
2
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3. What is the law of thermodynamics?
3
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4. An ideal gas is compressed isothermally. What is the enthalpy change?
4
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5. Name the process that has no heat transfer.
5
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6. An ideal gas is compressed in a cylinder so well insulated that there is essentially no heat transfer. The temperature of the gas.
6
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7. What is the SI unit of pressure?Ā²
7
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8. The equation Cp=Cv+R applies to which of the following?
8
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9. In the flow process, neglecting kinetic and potential energy, the integral of VdP represents what?
9
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10. Mechanical energy of pressure transformed into energy of heat.
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11. The theory of changing heat into mechanical work.
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12. Average pressure on a surface when a changing pressure condition exist.
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13. Which of the following cycles consists two isothermal and two constant volume processes?
13
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14. A control volume refers to what?
14
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15. In the polytropic process, PVāæ=constant, if the value of n is infinitely large, the process is
15
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16. If the temperature is held constant and the pressure is increased beyond the saturation pressure, then the working medium must be: Untitled Question
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17. Is one whose temperature is below the saturation temperature corresponding to its pressure.
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18. Number of molecules in a mole of any substance is a constant called________
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19. If the pressure of a gas is constant the volume is directly proportional to absolute temperature.
19
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20. The number of protons in the nucleus of an atom or the number of electrons in the orbit of an atom.
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21. In a P-T diagram of a pure substance, the curve separating the solid phase from the liquid phase is:
21
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22. A water temperature of 18 Ā°F in the water-cooled condenser is equivalent in Ā°C to ________
22
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23. The latent heat of vaporized in joules per kg is equal to ____________.
23
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24. From of energy associated with the kinetic energy of the random motion of large number of molecules
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25. If the temperature is held constant and the pressure is increased beyond the saturation pressure, then the working medium must be:
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26. Is the condition of pressure and temperature at which a liquid and its vapor are indistinguishable.
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27. When a substance in gaseous state is below the critical temperature it is called _________
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28. Superheated vapor behaves
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29. Which of the following provides the basis for measuring thermodynamic property of temperature?
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30. Which of the following is commonly used as liquid absorbent? Untitled Question
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31. Mechanism designed to lower the temperature of air passing through it.
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32. A device for measuring the velocity of wind
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33. Heat normally flowing from a high temperature body to a low temperature body wherein it is impossible to convert heat without other effects.
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34. The temperature at which its vapor pressure is equal to the pressure exerted on the liquid.
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35. A nozzle is used to
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36. The sum of the energies of all the molecules in a system where energies appear in several complex form.
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37. The total energy in a compressible fluid flowing across any section in a pipeline is a function of.
37
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38. The ratio of the density of a substance to the density of some standard substance.
38
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39. Is one whose pressure is higher than the saturation pressure corresponding to its temperature.
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40. The changing of solid directly to vapor without passing through the liquid state is called
40
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41. Weight per unit volume is termed as ________
41
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42. What is the SI unit of force?
42
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43. The volume of fluid passing a cross-section of steam in unit time.
43
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44. What equation applies in the first law of thermodynamics for an ideal gas in a reversible open steady state system?
44
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45. A pressure of 1 milli bar is equivalent to
45
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46. When a system deviates infinitesimally from equilibrium at every instant of its state, it is undergoing:
46
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47. What is the force which tends to draw a body toward the center about which it is rotating?
47
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48. What is the process that has no heat transfer?
48
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49. Which of the engine is used for fighter bombers?
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50. Exhaust gases from an engine posses
50
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51. At critical point the latent enthalpy of vaporization is
51
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52. What is the force which tends to draw a body toward the center about which it is rotating?
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53. When a system deviates infinitesimally from equilibrium at every instant of its state, it is undergoing
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54. A pressure of 1 milli bar is equivalent to
54
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55. Work done per unit charge when changed is moved from one point to another
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56. How many independent properties are required to completely fix the equilibrium state of a pure gaseous compound? Untitled Question
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57. Which of the following relations defines enthalpy?
57
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58. Which of the following is true for water at a reference temperature where enthalpy is zero?
58
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59. On what plane is the mollier diagram plotted?
59
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60. The compressibility factor z, is used for predicting the behavior of non-ideal gasses. How is the compressibility factor defined relative to an ideal gas? (Subscript c refers to critical value.)
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61. How is the quality x of a liquid vapor mixture defined?
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62. What is the expression for heat of vaporization?
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63. What is the value of the work done for a closed, reversible, isometric system?
63
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64. What is the equation for the work done by a constant temperature system?
64
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65. What is true about the polytropic exponent n for a perfect gas undergoing an isobaric process?
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66. How does an adiabatic process compare to an isentropic process?
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67. During an adiabatic, internally reversible process, what is true about the change in entropy?
67
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68. For an irreversible process, what is true about the change in entropy of the system and surroundings? Untitled Question
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69. For which type of process does the equation dQ = Tds hold?
69
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70. Which of the following is true for any process?
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71. Which of the following thermodynamic cycle is the most efficient?
71
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72. The ideal reversible carnot cycle involves four basic processes. What type of processes are they?
72
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73. What is the temperature difference of the cycle if the entropy difference is āS , and work done is W?
73
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74. Which of the following is not an advantage of a superheated, closed rankine cycle over an open Rankine cycle?
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75. Which of the following statements regarding Rankine cycle is not true?
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76. Which one of the following is standard temperature and pressure (STP)
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77. A substance is oxidized when which of the following occurs?
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78. Which of the following is not a unit of pressure?
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79. Which of the following is the definition of joule?
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80. Which of the following is the basis for Bernoulliās law for fluid flow?
80
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82. The state of a thermodynamic system is always define by its:
81
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83. In any non quasi-static thermodynamics process, the overall entropy of an isolated system will
82
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84. Entropy is the measure of:
83
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85. Which of the following statement about entropy is false?
84
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86. Work energy can be a function of all the following except:
85
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87. Energy change are represented by all except which one of the following:
86
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88. U + pV is a quantity called:
87
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89. In flow process, neglecting KE and PE changes, ŹvdP represents which item below?
88
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90. Power may be expressed in units of
89
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91. Equilibrium condition exist in all except which of the following?
90
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92. In a closed system (with a moving boundary) which of the following represents work done during an isothermal process?
91
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93. A substance that exists or is regarded as existing as a continuous characterized by a low resistance to flow and the tendency to assume the shape of its container.
92
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4. A substance that is homogenous in composition and homogenous and invariable in chemical aggregation.
93
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95. A substance whose state is defined by variable intensive thermodynamic properties.
94
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96. A system in which there is no exchange of matter with the surrounding or mass does not cross its boundaries
95
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97. A system that is completely impervious to its surrounding or neither mass nor energy cross its boundaries.
96
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98. A system in which there is a flow of mass across its boundaries.
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99. The properties that are dependent upon the mass of the system and are total values such as total volume and total internal energy.
98
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100. The properties that are independent of the mass of the system such as temperature, pressure, density and voltage.
99
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101. The properties for a unit mass and are intensive by definition such as specific volume.
100
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102. The condition as identified through the properties of the substance, generally defined by particular values of any two independent properties.
101
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103. The only base unit with a prefix kilo is
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104. The force of gravity on the body.
103
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105. The mass per unit volume of any substance.
104
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106. The force of gravity on unit volume is
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107. The reciprocal of density is
106
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108. Avogadroās number, a fundamental constant of nature is the number of molecules in gram mole This constant is
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109. The ratio of the gas constant to Avogadroās number is:
108
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110. The absolute zero on the Fahrenheit scale is at
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111. Absolute temperature on the Fahrenheit scale are called:
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112. The absolute zero on the celcius scale is at
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113. What is the absolute temperature in celsius scale?
112
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115. The centigrade scale was introduced by Andres Celcius in what year?
113
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116. The National Bureau of Standard uses, among others, the liquid vapor equilibrium of hydrogen at
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117. The national Bureau of Standard uses among others, the liquid vapor equilibrium of nitrogen at
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118. The liquid vapor equilibrium of oxygen is at what temperature?
116
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119. The solid liquid equilibrium of mercury is at what temperature?
117
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120. The solid liquid equilibrium of Tin is at what temperature?
118
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121. The solid liquid equilibrium of Zinc is at what temperature?
119
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122. The liquid vapor equilibrium of sulfur is at what
120
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123. The solid liquid equilibrium of Antimony is at what temperature?
121
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124. The solid liquid equilibrium of silver is at what temperature?
122
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125. The solid liquid equilibrium of gold is at what temperature?
123
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126. The solid liquid equilibrium of platinum is at what temperature?
124
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127. The solid liquid equilibrium of Tungsten is at what temperature?
125
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128. The device that measures temperature by the electromotive force.
126
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129. The emf is a function of the temperature difference between the junction a phenomenon called.
127
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130. The device that measure temperature by the electromotive force called thermocouple was discovered by:
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131. When two bodies isolated from other environment are in thermal equilibrium with a third body, two are in thermal equilibrium with each other.
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132. The total entropy of pure substance approaches zero as the absolute thermodynamics temperature approaches zero
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133. If any one or more properties of as system change the system is said to have undergone a _______
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134. When a certain mass of fluid in a particular state passes through a series of processes and returns to its initial state it undergoes a:
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135. The term given to the collection of matter under consideration enclosed within a boundary.
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136. The region outside the boundary or the space and matter external to a system:
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137. The true pressure measured above a perfect vacuum.
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138. The pressure measured from the level of atmospheric pressure by most pressure recording instrument like pressure gage and open ended manometer.
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139. The pressure obtained from barometer reading
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140. It is a form of energy associated with the kinetic random motion of large number of molecules.
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141. The heat needed to change the temperature of the body without changing its phase.
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142. The heat needed by the body to change its phase without changing its temperature.
140
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143. The measure of the randomness of the molecules of a substance.
141
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144. The heat energy transferred to a substance at a constant pressure process is ________
142
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145. It is the energy stored within the body
143
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146. A theoretically ideal gas which strictly follows Boyleās law and Charleās law of gases.
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147. In a confined gas, if the absolute temperature is held constant, the volume is inversely proportional to the absolute pressure.
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148. In a confined gas if the absolute pressure is held constant the volume is directly proportional to the absolute temperature.
146
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149. The pressure exerted in a vessel by a mixture of gases is equal to the sum of the pressure that each separate gas would exert if it alone occupied the whole volume of the vessel
147
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150. At equal volume at the same temperature and pressure conditions, the gases contain the same number of molecules.
148
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151. A process in which the system departs from equilibrium state only infinitesimally at every instant.
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152. A process which gives the same state/conditions after the system undergoes a series of processes
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153. A thermodynamic system that generally serves as a heat source or heat sink for another system.
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154. A thermodynamic system that operates continuously with only energy (heat and work) crossing its boundaries; its boundaries are impervious to the flow of mass.
152
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155. A surface that is impervious to heat is
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156. One of the consequences of Einsteinās theory of relativity is that mass may be converted into energy and energy into mass the relation being given by the famous equation. E = mcĀ².What is the value of the speed of light c?
154
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157. In the polytrophic process we have pvāæ = constant,if the value of n is infinitely large,the process is called.
155
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158. The thermodynamic cycle used in a thermal power plants
156
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159. For the same heat input and same compression ratio ;
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160. A heat exchanger process where in the product of pressure and volume remains constant called:
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161. Which of the following provides the basis for measuring thermodynamic property of temperature?
159
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163. Under ideal conditions, isothermal, isobaric, isochoric and adiabatic processes are;
160
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164. Isentropic flow is
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165. Exhaust gases from an engine possess
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166. The extension and compression of a helical spring is an example of what process?
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167. At critical point the latent enthalpy of vaporization is
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168. Which of the following relating is not applicable in a free expansion process?
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169. The triple point of a substance is the temperature and pressure at which: A. The solid and liquid
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170. According to Clausius statement
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171. A heat engine is supplied heat at rate of 30,000 J/s gives an output of 9kW.The thermal efficiency of the engine is
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172. The RMS velocity of hydrogen gas at N.T.P is approximately _________
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173. Which of the following cycles has two isothermal and two constant volume processes?
170
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174. āIt is impossible to construct a heat engine that operates in a cycle and receives a given quantity of heat from a high temperature body and does an equal amount of work ā The above statement is known as:
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175. For steam nozzle, which of the following ratios will have the value less than unity?
172
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176. A Bell Coleman cycle is a reversed
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177. Ericson cycle consists of the following four processes:
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178. A steam nozzle changes
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179. Which is not correct for calculating air standard efficiency?
176
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180. According to Pettlier Thomson effect;
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181. In actual gases the molecular collision is:
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182. The Beatle-Bridgeman equation of state is quite accurate in cases of:
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183. Which of the following statement about Van der Waals equation is correct?
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184. The Clapeyronās equation is applicable to:
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185. The vapor pressure is related to the enthalpy of vaporization by the;
182
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186. Solubility of gas in a liquid at small concentration can be represented by which law?
183
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187. A compound pressure gauge is used to measure:
184
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188. Which of the engine is used for fighter bombers?
185
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189. The thermal efficiency of gas vapor cycle as compared to steam turbine or gas turbine
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190. The process in which heat energy is transferred to a thermal energy storage device is known as;
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191. The absolute zero in celsius scale is;
188
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192. What is the temperature when water and vapor are in equivalent with the atmospheric pressure?
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193. The temperature of a pure substance at a temperature of absolute zero is;
190
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194. When the number of reheat stage in a reheat cycle is increased, the average temperature;
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195. A temperature measurement in an ordinary thermometer which has constant specific humidity
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196. In a closed vessel when vaporization takes place, the temperature rises, due to the rising temperature, the pressure increases until an equilibrium is established between the temperature and pressure, The temperature of equilibrium is called:
193
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197. When hot soup was served in a cup during dinner an engineer was so eager to drink it. Since it was hot, he added cubes of ice to cool the soup and stirred it. He noticed that dew starts to form on the outermost surface of the cup. What is this temperature equal to?
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198. Is a measure of the energy that is no longer available to perform useful work within the current environment.
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199. A graph of enthalpy versus entropy for steam
196
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200. The reaction of inertia in an accelerated body is called
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201. A Mollier chart of thermodynamic properties is shown in which of the following diagrams?
198
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202. The following are included in the first law of thermodynamics for closed system EXCEPT
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203. All processes below are irreversible except one, Which one?
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204. The combination of conditions that best describes a thermodynamic process is given by which of the following?
I. Has successive states through which the system passes
II. When reversed leaves no change in the system
III. When reversed leaves no change in the system or the surroundings
IV. States are passes through so quickly that the surroundings do not change
201
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205. The sum of the energies of all the molecules in a system where energies appear in several complex forms is the;
202
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206. The Carnot refrigeration cycle includes all of the following process except:
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207. The maximum possible work that can be obtained a cycle operating between two reservoirs is found from
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208. The following factors are necessary to define a thermodynamic cycle except
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209. All of the following terms included in the second law for open system except
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210. The following terms are included in the first law of thermodynamics for open system except
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211. The following terms are included in the first law of thermodynamics for closed system except
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212. Which of the following statements about a path function is not true?
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213. A constant pressure thermodynamic process obeys:
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215. Represent the temperature an ideal gas will attain when it is brought to rest adiabatically
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216. Gauge pressure and absolute pressure differ from each other by.
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217. Each of the following are correct values of standard atmospheric pressure except;
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218. All of the following are the properties of an ideal gas except:
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219. Which of the following is not the universal gas constant?
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220. The following are all commonly quoted values of standard temperatures and pressure except:
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221. The variation of pressure in an isobaric process is;
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222. For liquid flow the enthalpy is the sum of internal energy and _________
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223. A thermodynamic process whose deviation from equilibrium is infinitesimal at all times is ________
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224. Which thermodynamics property best describe the molecular activity of a substance?
220
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225. Stagnation enthalpy represents the enthalpy of a fluid when it is brought to rest _________
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226. During stagnation process the kinetic energy of a fluid is
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227. The properties of fluid at the stagnation in state are called
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228. All of the following are thermodynamic properties except ________
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229. A liquid boils when its vapor pressure equals
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230. A system composed of ice and water at 0Ā°C is said to be ;__________
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231. The heat of fusion of a pure substance is:
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232. The heat of vaporization involves the change in enthalpy due to:
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233. The heat of sublimation involves the change in enthalpy due to ______________
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234. A specific property
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235. A materialās specific heat can be defined as:
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236. If a substance temperature is less than its saturation temperature, the substance is:
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237. If a substance temperature is equal to its saturation temperature, the substance is a _________
233
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238. If a substanceās temperature is greater than its saturation temperature, the substance is a __________
234
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239. Critical properties refer to
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240. For a saturated vapor, the relationship between temperature and pressure is given by.
236
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241. Properties of a superheated vapor are given by
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242. Properties of non-reacting gas mixture are given by:
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243. The relationship between the total volume of a mixture of non-reaching gases and their partial volume is given by ;
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244. The relationship between the total pressure of a mixture of non-reacting gases and the partial pressures of constituents is given by:
240
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245. Which of the following is the best definition of enthalpy?
241
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246. Which of the following statement is not true real gases?
242
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247. The stagnation state is called the isentropic stagnation state when the stagnation process is;
243
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248. The entropy of a fluid remains constant during what process?
244
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249. All of the following processes are irreversible except
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250. All of the following processes are irreversible except
246
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251. All of the following processes are irreversible except;
247
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252. Which of the following state(s) is/are necessary for a system to be in thermodynamic equilibrium?
248
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253. Adiabatic heat transfer within a vapor cycle refers to
249
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254. The work done in a adiabatic process in a system:
250
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255. Based on the first law of thermodynamics which of the following is wrong?
251
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256. Assuming real processes the entropy change in the universe:
252
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257. Which of the following types of flow meters is most accurate?
253
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258. What is referred by control volume?
254
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259. What is the most efficient thermodynamic cycle?
255
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260. How do you treat a statement that is considered a scientific law?
256
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261. An instrument commonly used in most research and engineering laboratories because it is small and fast among the other thermometers
257
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262. In an actual gas, the molecular collision are
258
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263. Which of the following is used in thermal power plant?
259
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264. The elongation and compression of a helical spring is an example of A. Irreversible p
260
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265. Otto cycle consist of
261
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266. Brayton cycle has
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267. A bell coleman cycle is a reversed
263
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268. A steam nozzle changes
264
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269. The pitot tube is a device used for measurement of
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270. The continuity equation is application to
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Q.
271. The work done by a force of R Newtons moving in a distance of L meters is converted entirely into kinetic energy and expressed by the equation:
267
30 sec
Q.
272. Gas being heated at constant volume is undergoing the process of :
268
30 sec
Q.
273. Dew point is defined as.
269
30 sec
Q.
274. What do you call the changing of an atom of element into an atom of a different element with a different atomic mass?
270
30 sec
Q.
275. What do you call the weight of the column of air above the earthās surface
271
30 sec
Q.
276. What keeps the moisture from passing through the system?
272
30 sec
Q.
277. What condition exist in an adiabatic throttling proces?
273
30 sec
Q.
278. The specific gravity of a substance is the ratio of its density to the density of;
274
30 sec
Q.
279. A compound pressure gauge is used to measure
275
30 sec
Q.
280. Isentropic flow is
276
30 sec
Q.
281. Under ideal conditions, isothermal, isobaric, isochoric and adiabatic processes are ;
277
30 sec
Q.
282. One watt is:
278
30 sec
Q.
283. A temperature above which a given gas cannot be liquefied:
279
30 sec
Q.
284. The effectiveness of a body as a thermal radiator at a given temperature.
280
30 sec
Q.
285. Which of the following occurs in a reversible polytrophic process?
281
30 sec
Q.
286. The instrument used to measure atmospheric pressure is:
282
30 sec
Q.
287. A pneumatic tool is generally powered by
283
30 sec
Q.
288. Which of the following gases can be used to measure the lowest temperature?
284
30 sec
Q.
289. The triple point of a substance is the temperature and pressure at which:
285
30 sec
Q.
290. Which of the following relation is not application in a free expansion process?
286
30 sec
Q.
291. Ericsson cycle has
287
30 sec
Q.
292. A stirling cycle has
288
30 sec
Q.
293. The temperature of the fluid flowing under pressure through a pipe is usually measured by;
289
30 sec
Q.
294. Specific heat capacity is an SI derived unit describe as
290
30 sec
Q.
295. Which of the following is mathematically a thermodynamic property?
291
30 sec
Q.
296. When the expansion or compression of gas takes place without transfer of heat to or from the gas process is called:
292
30 sec
Q.
297. Another name for the liquid valve is:
293
30 sec
Q.
298. A liquid whose temperature is lower than the saturation temperature corresponding to the existing pressure:
294
30 sec
Q.
299. The law that state āEntropy of all perfect crystalline solids is zero at absolute zero temperature:
295
30 sec
Q.
300. What should be the temperature of both water and steam whenever they are present together?
296
30 sec
Q.
301. A manometer is an instrument that is used to measure:
297
30 sec
Q.
302. What is the area under the curve of a temperature entropy diagram?
298
30 sec
Q.
303. What do bodies at a temperature above absolute zero emit?
299
30 sec
Q.
304. In the absence of any irreversibilities, a thermoelectric generator, a device that incorporates both thermal and electric effects, will have the efficiency of a/an
300
30 sec
Q.
305. Both steam engines and ericson engines are
301
30 sec
Q.
306. Nozzles does not involve any work interaction. The fluid through this device experience:
302
30 sec
Q.
307. If the actual kinetic energy of a nozzle is Ka and Ki is the maximum value that can be attained by an isentropic expansion from an initial to final state, then the efficiency of the nozzle is:
303
30 sec
Q.
308. The conversion section of a nozzle increases the velocity of the flow of the gas. What does it to do on its pressure?
304
30 sec
Q.
309. In closed vessel, when vaporization takes place, the temperature rises. Due to the rising temperature, the pressure increases until an equilibrium is established between the temperature and pressure. The temperature of equilibrium is called _____
305
30 sec
Q.
310. At steam point the temperatures of water and its vapor at standard pressure are:
306
30 sec
Q.
311. When hot soup was served in a cup during dinner, an engineer was so eager to drink it. Since it was hot, he added cubes of ice to cool the soup and stirred it. He noticed that dew start to form on the outermost surface of the cup, He wanted to check the temperature of the outermost surface of the cup. What is this temperature equal to?
307
30 sec
Q.
312. What do you call a conversion technology that yields electricity straight from sunlight without the aid of a working substance like gas or steam without the use of any mechanical cycle?
308
30 sec
Q.
313. Which of the following property of liquid extend resistance to angular or shear deformation:
309
30 sec
Q.
314. What is the pressure at the exit of a draft tube in a turbine?
310
30 sec
Q.
315. When change in kinetic energy of a compressed gas are negligible or insignificant, the work input to an adiabatic compressor is _______
311
30 sec
Q.
316. What is the area under the curve of a pressure volume diagram?
312
30 sec
Q.
317. In Stirling and Ericson cycle, regeneration can
313
30 sec
Q.
318. The first law of thermodynamics is based on which of the following principles?
314
30 sec
Q.
319. In two phase system, 30% moisture means
315
30 sec
Q.
320. At 101.325 kPa, the boiling point of water is 100 Ā°C. If the pressure is decreased, the boiling temperature will:
316
30 sec
Q.
321. Which of the following is equivalent to 1hp in Btu/hr?
317
30 sec
Q.
322. What is the pressure above zero?
318
30 sec
Q.
323. One Newton - meter is equal to :
319
30 sec
Q.
324. Which of the following is the instrument used to measure fluid velocity?
320
30 sec
Q.
325. Cryogenic temperature ranges from:
321
30 sec
Q.
326. Steam at 2 kPa is saturated at 17.5 Ā°C.in what state will the state be at 40Ā°C if the pressure is 2.0 kPa?
322
30 sec
Q.
327. Acceleration is proportional to force.
323
30 sec
Q.
328. Which of the following could be defined as simply push and pull?
324
30 sec
Q.
329. The true pressure measured above a perfect vacuum is:
325
30 sec
Q.
330. If an initial volume of an ideal gas is compressed to one half its original volume and to twice its original temperature the pressure:
326
30 sec
Q.
331. When the expansion or compression of gas takes place without transfer of heat to or from the gas, the process is called:
327
30 sec
Q.
332. A body radiates heat proportional to the fourth power of its absolute temperature:
328
30 sec
Q.
333. All substance emit radiation, the quantity and quality of which depends upon the absolute temperature and the properties of the material, composing the radiating body.
329
30 sec
Q.
334. For bodies in thermal equilibrium with their environment the ratio of total emissive power to the absorption is constant at any temperature.
