Thermodynamics MCQ
1. What can never be reached in reality?
Answer
Correct Answer:
Reversible processes
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2. What happens when the Reverse Carnot Cycle is reversed?
Answer
Correct Answer:
Carnot refrigeration cycle
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3. What type of cycle is a reversible cycle?
Answer
Correct Answer:
Carnot cycl
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4. What is another term for the reversible cycle in which all four processes that comprise the Carnot cycle are reversed during operation?
Answer
Correct Answer:
Reversed Carnot cycl
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5. What is used in isentropic processes of ideal gases?
Answer
Correct Answer:
Relative specific volume
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6. What is Pr used for in ideal gas processes?
Answer
Correct Answer:
Isentropic processes
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7. What is Pr the quantity defined as the exp(s°/R)?
Answer
Correct Answer:
Relative pressure
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8. Pr is a relative pressure that is a function of what?
Answer
Correct Answer:
Temperature only
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9. What is the humidity expressed as?
Answer
Correct Answer:
The ratio of the vapour pressure to the saturation pressure of water
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10. What is the measure of the amount of moisture the air holds relative to the maximum amount the air can hold?
Answer
Correct Answer:
Relative humidity
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11. What does the term 'regenerator effectiveness' refer to?
Answer
Correct Answer:
The extent to which a regenerator approaches an ideal regenerator
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12. The ratio of heat transfer to the compressor exit gas to the maximum possible heat transfer to the compressor exit gas is known as what?
Answer
Correct Answer:
Regenerator effectiveness
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13. During what part of the cycle is heat transferred back to the working fluid?
Answer
Correct Answer:
Another part of the cycle
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14. What type of storage device is used during regeneration?
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15. A what is a thermal energy storage device called?
Answer
Correct Answer:
Regenerator
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16. What are refrigerators?
Answer
Correct Answer:
Cyclic devices which allow the transfer of heat from a low-temperature medium to a high-temperature medium
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17. Refrigerators allow the transfer of what from a low-temperature medium to a high-temperature medium?
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18. What is the efficiency of a refrigerator indicated by the term COPR?
Answer
Correct Answer:
Refrigerator coefficient of performance
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19. What does a refrigerator do to remove heat from a space?
Answer
Correct Answer:
Maintain the refrigerated space at a low temperature
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20. What does the term "refrigerator" mean?
Answer
Correct Answer:
A cyclic device which causes the transfer of heat from a low-temperature region to a high-temperature region
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21. What causes the transfer of heat from a low-temperature region to a high-temperature region?
Answer
Correct Answer:
Refrigerator
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22. What type of cycle is used to move refrigerant?
Answer
Correct Answer:
Refrigeration
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23. What is the working fluid used in the refrigeration cycle?
Answer
Correct Answer:
Refrigerant
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24. What property or properties is chosen to assign a value of zero?
Answer
Correct Answer:
Convenient
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25. What is chosen to assign a value of zero for a convenient property or properties at that state?
Answer
Correct Answer:
Reference state
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26. What does TR stand for?
Answer
Correct Answer:
Reduced temperature
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27. What is the ratio of the temperature to the critical temperature known as?
Answer
Correct Answer:
Reduced temperature TR
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28. What is the ratio of reduced pressure to critical pressure?
Answer
Correct Answer:
Reduced pressure PR
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29. What kind of pressure reduction is the ratio of the pressure to the critical pressure?
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30. What does reciprocity relation show?
Answer
Correct Answer:
That the inverse of a partial derivative is equal to its reciprocal
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31. A partial derivative is equal to its what?
Answer
Correct Answer:
Reciprocal
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32. What do reactants consist of?
Answer
Correct Answer:
The components that exist before the reaction
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33. What are the components that exist before a reaction in a combustion process?
Answer
Correct Answer:
Reactants
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34. What is the Rayleigh line the locus of all states for?
Answer
Correct Answer:
Frictionless flow
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35. What is the Rayleigh line the locus of in a constant area duct with heat transfer plotted on a T-s diagram?
Answer
Correct Answer:
All states for frictionless flow
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36. What is the amount of heat transferred per unit time?
Answer
Correct Answer:
Rate of heat transfer
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37. How much heat is transferred per unit time?
Answer
Correct Answer:
Heat transfer
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38. What does the law relate the mole fractions of in the liquid and gas phases of a two-phase mixture?
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39. What scale is used for thermodynamic temperature?
Answer
Correct Answer:
Rankine scale
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40. Who is the scale named after?
Answer
Correct Answer:
William Rankine
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41. What process does reheating serve to fix in the lower-pressure stages of turbines?
Answer
Correct Answer:
Excessive moisture
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42. What is the name of the modification of the Rankine cycle in which the steam is expanded in two stages?
Answer
Correct Answer:
Rankine cycle with reheat
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43. What is the name of the engine that uses a ramjet?
Answer
Correct Answer:
Ramjet engine
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44. Ramjet engines need to be brought to a sufficiently high speed by an external source before they can be fired, this speed is provided by what?
Answer
Correct Answer:
Ram effect
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45. Ramjet engines are sometimes used for what?
Answer
Correct Answer:
High-speed propulsion of missiles and aircraft
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46. What is the transfer of energy due to the emission of electromagnetic waves?
Answer
Correct Answer:
Radiation
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47. What type of transfer does radiation imply?
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48. What can an equilibirum process be viewed as being if it is not a quasi-equilibrium process?
Answer
Correct Answer:
A sufficiently slow process
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49. What could a sufficiently slow process be thought of as allowing a system to do?
Answer
Correct Answer:
Adjust itself
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50. Which term is used to describe the ratio of mass of vapor to the total mass?
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51. What is the ratio of vapor to the total mass of a saturated mixture called?
Answer
Correct Answer:
Quality x
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52. What is a three dimensional surface in space that represents the behaviour of a substance?
Answer
Correct Answer:
P-v-T surface
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53. What are the single-phase regions in the P-v-T surface of a substance?
Answer
Correct Answer:
Curved surfaces
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54. What has an unchanging chemical composition?
Answer
Correct Answer:
Substance
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55. What does having a fixed chemical composition throughout mean?
Answer
Correct Answer:
Pure substance
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56. What does a pump increase the pressure of?
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57. What device increases the pressure of liquids?
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58. What is the property of air at a given pressure and two independent intensive properties?
Answer
Correct Answer:
Psychrometric chart
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59. When using the generalized compressibility chart, what is the value used when determining the third property?
Answer
Correct Answer:
Pseudo-reduced specific volume
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60. In what chart is the pseudo-reduced specific volume used to determine the third property?
Answer
Correct Answer:
Generalized compressibility chart
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61. In what form is the amount of specific volume used in the generalized compressibility chart?
Answer
Correct Answer:
Pseudo-reduced
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62. What does the distance per unit time measure?
Answer
Correct Answer:
The aircraft velocity
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63. What is the power developed from the thrust of aircraft gas turbines?
Answer
Correct Answer:
Propulsive power
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64. What does the term "propulsive efficiency" refer to?
Answer
Correct Answer:
The ratio of the power produced to propel the aircraft
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Power Engineering, Power Plant Engineering MCQs | Topic-wise
