Test 1~2

100問 • 3年前

Jacky Shane Luyas Buhia

通報

問題一覧

1. Devices for converting heat transfer to work are called

C. Heat Engines

2. Use to measure the performance of the engine is

A. Efficiency

3. Internal combustion uses the ignition of combustible fuel within the engine itself as the source of energy which is partially converted into

C. Work

4. Heat is transferred during ______________ in Carnot cycle.

A. Isothermal process

5. During the isentropic compression of Carnot cycle, the pressure

B. Increases

6. During the isentropic expansion of Carnot cycle, the pressure

A. Decreases

7. The temperature during the heat rejection in Carnot cycle is known as

B. Temperature sink

8. The efficiency of Carnot cycle depends mainly in

D. Temperature ranges

9. The net area under T-s diagram of Carnot cycle is

C. Work

10. Mean effective pressure is the ratio of Net Work and

B. Volume displacement

11. A Carnot cycle has two isothermals and two

B. Isentropic process

12. Stirling cycle uses a _________ as a working fluids.

D. Compressible fluids

13. Stirling cycle has two isothermals and two constant

A. Volumes process

14. In Stirling process the heat is added during

C. Isothermal process

15. A chamber containing wire or ceramic mesh or fine metallic gauze and is used for the temporary storage of

B. energy

16. The energy stored and released by the regenerator is known as

C. Internal energy

17. The efficiency of Stirling cycle is the same as that of efficiency.

D. Carnot cycle

18. The Ericsson cycle has two isothermals and two constant

D. pressure process

19. The heat exchanger used in an Ericsson cycle is known as

D. Recuperator

20. The energy exchange process in Ericsson cycle takes place during

B. isobaric process

21. The greatest net work output per cycle in Stirling cycle is obtained with the smallest pressure ratio across the turbine; the greatest volumetric expansion ratio and operating at the highest temperature at

A. Turbine inlet

22. Brayton cycle is also known as

B. Joule cycle

23. The heat in Brayton cycle is added during

D. isobaric process

24. The Brayton cycle has isobaric and two

C. isentropic process

25. The efficiency of the closed-cycle Brayton engine is found to depend on the

B. pressure ratio only

26. If the inlet pressure to the turbine increases, the inlet temperature to the turbine will also

A. increase

27. Higher inlet pressure and temperature to the turbine as well as a larger temperature ratio, resulting from greater heat transfer per cycle, per cycle.

C. will increase the mean effective pressure

28. The is the ratio of compressor work input to the turbine work output.

D. work ratio

29. As the work ratio approaches unity, the net work output of the Brayton engine approaches

A. zero

30. If the turbine and/or compressor efficiency becomes low enough, the efficiency of the cycle can become zero and the work ratio can exceed in Gas turbine.

C. unity

31. A recuperation can ________ of Brayton cycle.

B. improved the efficiency

32. The total energy of the gas leaving the turbine is minimized so that the turbine work output is

A. maximized

33. Is applied to propulsion of vehicles because of certain practical characteristics.

D. Brayton cycle

34. The has the general advantage of being able to burn fuels that required little refining and of having few moving parts.

A. automotive gas-turbine engine

35. Aircraft Brayton cycle engines is also known as

A. Turbojet

36. Is commonly used is stationary power plants,

C. Brayton cycle

37. Otto cycle has two constant volume and two

D. isentropic process

38. The heat added in Otto cycle is during process

B. constant volume process

39. The efficiency of Otto cycle is dependent on the only.

D. compression ratio

40. Exhaust stroke of Gasoline engine is also known as

B. scavenging

41. Under steady operation, the mass flow rate of each fluid stream flowing through a heat exchanger

C. remains constant

42. Heat exchangers typically involve

A. no work interactions

43. When the entire heat exchanger is selected as control volume, heat becomes

A. zero

44. If the process involved changes within the control volume with time then is called

A. transient flow process

45. A process will not occur unless

A. it satisfies both the first and the second laws of thermodynamics

46. The________ is also used in determining the theoretical limits for the performance of

C. Second law of thermodynamics

47. Thermal energy capacity is the product of

B. mass and specific heat

48. A two phase system can be modeled as a reservoir also since it can absorb and release large quantities of heat while at

A. constant temperature

49. A reservoir that supplies energy in the form of heat is called a

B. source

50. A reservoir that absorbs energy in the form of heat is called

A. sink

51. Thermal energy reservoir that supplies energy in the form of heat is called

A. work reservoir

52. A device that is used to convert the heat to work is called

C. heat engines

53. Heat engines rejects heat to a

A. low temperature sink

54. The work producing device that best fits into the definition of a heat engine is the

C. Steam power plant

55. The net work output of a heat engine is always

A. less than the amount of heat input

56. The fraction of the heat input that is converted to net work output is a measure of the performance of a heat engine and is called the

A. thermal efficiency

57. Is the ratio of desired output over the required input.

C. performance

58. Is the ratio of net work output and the total heat input.

A. Thermal efficiency

59. The thermal efficiency of a heat engine is always

C. less than unity

60. In a steam power plant, the device where large quantities of waste heat is rejected

B. to rivers, lakes or the atmosphere.

61. The energy that cannot be recycled, and it is properly called

C. waste energy

62. Statement states that it is impossible for any device that operates on a cycle to receive 'heat from a single reservoir and produce a net amount of work.

C. Kelvin-Planc

63. The transfer of heat from a low-temperature medium to a high temperature one requires a special devices called

B. refrigerators

64. The working fluid used in the refrigeration cycle is called

C. refrigerant

65. The efficiency of refrigerator is expressed in terms of the

C. Coefficient of performance

66. The objective of refrigerator is

A to remove heat from the refrigerated space

67. The device that transfers heat from a low temperature medium to a high temperature one is

C. heat pump

68. The objective of a heat pump is to maintain a heated space at

B. high temperature

69. Are basically refrigerators whose refrigerated space is a room or a building instead of the food compartment.

C. air conditioners

70. A _____ cools a room by absorbing heat from the room air and discharging it to the outside.

C. window air conditioning unit

71. EER means

A. Energy Efficiency Rating

72. Is the amount of heat removed from the cooled space in Btu's for 1 W-hr of electricity consumed.

B. Energy efficiency rating

73. Most air conditioning have an EER between

A. 8 and 12

74. States that it is impossible to construct a device that operates in a cycle an produces no effect other than the of heat from a lower temperature body to a higher temperature body.

A. Clausius statement

75. A device that violates the first law thermodynamics is called a

C. perpetual-motion machine of the first kind

76. A device that violates the second law of thermodynamics is called

A. perpetual motion machine of second kind

77. A ______ is which can be reversed without leaving any trace on the surroundings.

B. reversible process

78. The process that are not reversible are called

A. irreversible process

79. The factors that causes a process to be irreversible are called

A. irreversibilities

80. Any friction that involves friction is

B. irreversible

81. The heat transfer process becomes less and less irreversible as the temperature difference between two bodies

A. approaches zero

82. A process is called_____ if no irreversible occur within the boundaries of the system during the process.

A. internally reversible

83. A process Is called _____if no system irreversibilities occur outside boundaries during the process.

A. externally reversible

84. The efficiency of an irreversible heat engine_____ of a reversible one operating between two reservoirs.

B. is always less than the efficiency

85. The efficiencies of all reversible heat engines operating between the same two reservoirs

B. are the same

86. A temperature scale that is independent of the properties of the substances that are used to measure temperature is called

B. a thermodynamic temperature scale

87. The triple point temperature is 273.16°K. Most work producing devices in operation have efficiencies under ______

C. 40%

88. The thermal efficiency of actual heat engines can be ______ by supplying heat to the engine at the highest possible engine at the lowest possible temperature.

A. maximized

89. Heat transfer to a system will increase the entropy of that system whereas heat transfer from the system will

B. decrease

90. The energy change of a closed system equals the______ for any process whereas the entropy change of a closed system equals the entropy transfer only for a reversible process.

A. energy transfer

91. Energy is transferred in the form of_____ whereas entropy is transferred only with heat.

A. heat or work

93. An energy interaction which is not accompanied by entropy transfer is

C. work

94. The entropy transfer for adiabatic system is

A. zero

95. Is generated during an irreversible process.

A. entropy

96. Total entropy change associated with a process must be

C. positive or zero

97. The entropy change of a buffer zone will be

A. zero

98. Heat transfer to a system increases the entropy of that system and heat transfer from a system

B. decrease

99. Irreversibilities always cause entropy to

A. increase

100. If the process involves no heat transfer, the entropy of a fixed mass must______during that process.

C. remains constant

100

92. An energy interaction which is accomplished by entropy transfer is

C. heat transfer

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問題一覧

1. Devices for converting heat transfer to work are called

C. Heat Engines

2. Use to measure the performance of the engine is

A. Efficiency

3. Internal combustion uses the ignition of combustible fuel within the engine itself as the source of energy which is partially converted into

C. Work

4. Heat is transferred during ______________ in Carnot cycle.

A. Isothermal process

5. During the isentropic compression of Carnot cycle, the pressure

B. Increases

6. During the isentropic expansion of Carnot cycle, the pressure

A. Decreases

7. The temperature during the heat rejection in Carnot cycle is known as

B. Temperature sink

8. The efficiency of Carnot cycle depends mainly in

D. Temperature ranges

9. The net area under T-s diagram of Carnot cycle is

C. Work

10. Mean effective pressure is the ratio of Net Work and

B. Volume displacement

11. A Carnot cycle has two isothermals and two

B. Isentropic process

12. Stirling cycle uses a _________ as a working fluids.

D. Compressible fluids

13. Stirling cycle has two isothermals and two constant

A. Volumes process

14. In Stirling process the heat is added during

C. Isothermal process

15. A chamber containing wire or ceramic mesh or fine metallic gauze and is used for the temporary storage of

B. energy

16. The energy stored and released by the regenerator is known as

C. Internal energy

17. The efficiency of Stirling cycle is the same as that of efficiency.

D. Carnot cycle

18. The Ericsson cycle has two isothermals and two constant

D. pressure process

19. The heat exchanger used in an Ericsson cycle is known as

D. Recuperator

20. The energy exchange process in Ericsson cycle takes place during

B. isobaric process

A. Turbine inlet

22. Brayton cycle is also known as

B. Joule cycle

23. The heat in Brayton cycle is added during

D. isobaric process

24. The Brayton cycle has isobaric and two

C. isentropic process

25. The efficiency of the closed-cycle Brayton engine is found to depend on the

B. pressure ratio only

26. If the inlet pressure to the turbine increases, the inlet temperature to the turbine will also

A. increase

27. Higher inlet pressure and temperature to the turbine as well as a larger temperature ratio, resulting from greater heat transfer per cycle, per cycle.

C. will increase the mean effective pressure

28. The is the ratio of compressor work input to the turbine work output.

D. work ratio

29. As the work ratio approaches unity, the net work output of the Brayton engine approaches

A. zero

30. If the turbine and/or compressor efficiency becomes low enough, the efficiency of the cycle can become zero and the work ratio can exceed in Gas turbine.

C. unity

31. A recuperation can ________ of Brayton cycle.

B. improved the efficiency

32. The total energy of the gas leaving the turbine is minimized so that the turbine work output is

A. maximized

33. Is applied to propulsion of vehicles because of certain practical characteristics.

D. Brayton cycle

34. The has the general advantage of being able to burn fuels that required little refining and of having few moving parts.

A. automotive gas-turbine engine

35. Aircraft Brayton cycle engines is also known as

A. Turbojet

36. Is commonly used is stationary power plants,

C. Brayton cycle

37. Otto cycle has two constant volume and two

D. isentropic process

38. The heat added in Otto cycle is during process

B. constant volume process

39. The efficiency of Otto cycle is dependent on the only.

D. compression ratio

40. Exhaust stroke of Gasoline engine is also known as

B. scavenging

41. Under steady operation, the mass flow rate of each fluid stream flowing through a heat exchanger

C. remains constant

42. Heat exchangers typically involve

A. no work interactions

43. When the entire heat exchanger is selected as control volume, heat becomes

A. zero

44. If the process involved changes within the control volume with time then is called

A. transient flow process

45. A process will not occur unless

A. it satisfies both the first and the second laws of thermodynamics

46. The________ is also used in determining the theoretical limits for the performance of

C. Second law of thermodynamics

47. Thermal energy capacity is the product of

B. mass and specific heat

48. A two phase system can be modeled as a reservoir also since it can absorb and release large quantities of heat while at

A. constant temperature

49. A reservoir that supplies energy in the form of heat is called a

B. source

50. A reservoir that absorbs energy in the form of heat is called

A. sink

51. Thermal energy reservoir that supplies energy in the form of heat is called

A. work reservoir

52. A device that is used to convert the heat to work is called

C. heat engines

53. Heat engines rejects heat to a

A. low temperature sink

54. The work producing device that best fits into the definition of a heat engine is the

C. Steam power plant

55. The net work output of a heat engine is always

A. less than the amount of heat input

56. The fraction of the heat input that is converted to net work output is a measure of the performance of a heat engine and is called the

A. thermal efficiency

57. Is the ratio of desired output over the required input.

C. performance

58. Is the ratio of net work output and the total heat input.

A. Thermal efficiency

59. The thermal efficiency of a heat engine is always

C. less than unity

60. In a steam power plant, the device where large quantities of waste heat is rejected

B. to rivers, lakes or the atmosphere.

61. The energy that cannot be recycled, and it is properly called

C. waste energy

62. Statement states that it is impossible for any device that operates on a cycle to receive 'heat from a single reservoir and produce a net amount of work.

C. Kelvin-Planc

63. The transfer of heat from a low-temperature medium to a high temperature one requires a special devices called

B. refrigerators

64. The working fluid used in the refrigeration cycle is called

C. refrigerant

65. The efficiency of refrigerator is expressed in terms of the

C. Coefficient of performance

66. The objective of refrigerator is

A to remove heat from the refrigerated space

67. The device that transfers heat from a low temperature medium to a high temperature one is

C. heat pump

68. The objective of a heat pump is to maintain a heated space at

B. high temperature

69. Are basically refrigerators whose refrigerated space is a room or a building instead of the food compartment.

C. air conditioners

70. A _____ cools a room by absorbing heat from the room air and discharging it to the outside.

C. window air conditioning unit

71. EER means

A. Energy Efficiency Rating

72. Is the amount of heat removed from the cooled space in Btu's for 1 W-hr of electricity consumed.

B. Energy efficiency rating

73. Most air conditioning have an EER between

A. 8 and 12

74. States that it is impossible to construct a device that operates in a cycle an produces no effect other than the of heat from a lower temperature body to a higher temperature body.

A. Clausius statement

75. A device that violates the first law thermodynamics is called a

C. perpetual-motion machine of the first kind

76. A device that violates the second law of thermodynamics is called

A. perpetual motion machine of second kind

77. A ______ is which can be reversed without leaving any trace on the surroundings.

B. reversible process

78. The process that are not reversible are called

A. irreversible process

79. The factors that causes a process to be irreversible are called

A. irreversibilities

80. Any friction that involves friction is

B. irreversible

81. The heat transfer process becomes less and less irreversible as the temperature difference between two bodies

A. approaches zero

82. A process is called_____ if no irreversible occur within the boundaries of the system during the process.

A. internally reversible

83. A process Is called _____if no system irreversibilities occur outside boundaries during the process.

A. externally reversible

84. The efficiency of an irreversible heat engine_____ of a reversible one operating between two reservoirs.

B. is always less than the efficiency

85. The efficiencies of all reversible heat engines operating between the same two reservoirs

B. are the same

86. A temperature scale that is independent of the properties of the substances that are used to measure temperature is called

B. a thermodynamic temperature scale

87. The triple point temperature is 273.16°K. Most work producing devices in operation have efficiencies under ______

C. 40%

88. The thermal efficiency of actual heat engines can be ______ by supplying heat to the engine at the highest possible engine at the lowest possible temperature.

A. maximized

89. Heat transfer to a system will increase the entropy of that system whereas heat transfer from the system will

B. decrease

90. The energy change of a closed system equals the______ for any process whereas the entropy change of a closed system equals the entropy transfer only for a reversible process.

A. energy transfer

91. Energy is transferred in the form of_____ whereas entropy is transferred only with heat.

A. heat or work

93. An energy interaction which is not accompanied by entropy transfer is

C. work

94. The entropy transfer for adiabatic system is

A. zero

95. Is generated during an irreversible process.

A. entropy

96. Total entropy change associated with a process must be

C. positive or zero

97. The entropy change of a buffer zone will be

A. zero

98. Heat transfer to a system increases the entropy of that system and heat transfer from a system

B. decrease

99. Irreversibilities always cause entropy to

A. increase

100. If the process involves no heat transfer, the entropy of a fixed mass must______during that process.

C. remains constant

100

92. An energy interaction which is accomplished by entropy transfer is

C. heat transfer