Thermodynamics I Quiz

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Core concepts in CET.

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Marj B

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Thermodynamics I Quiz


Froggy Jumps Thermodynamics I QuizVersion en ligne Core concepts in CET. par Marj B 1 The triple point on a p–T diagram is represented by a/an _____ a point b line c envelope 2 The triple point on a p–V diagram is represented by a/an _____ a line b point c envelope 3 Which law relates internal energy change to heat and work? a First Law of Thermodynamics b Third Law of Thermodynamics c Second Law of Thermodynamics 4 In a closed system, energy transfer as heat or work changes the system's what? a Internal energy b Enthalpy c Entropy 5 The validity of thermodynamic laws relies on ______. a lack of experimental contradiction b rigorous mathematical proof c statistical assumptions only 6 A rigid container holds a saturated liquid substance. If the substance is cooled while the volume remains constant, what state will the substance be in afterward? a Mixture of liquid and vapor b Saturated liquid c Saturated vapor 7 A rigid, insulated container of volume 𝑉 is split by a negligible partition. One side has 𝑛 moles of an ideal gas at 𝑇_𝑖; the other is a vacuum. The partition breaks, and the gas fills the whole volume. What is the work done? a W = 0 b W = Q c W = delta(H) 8 A rigid, insulated container of volume 𝑉 is split by a negligible partition. One side has 𝑛 moles of an ideal gas at 𝑇_𝑖; the other is a vacuum. The partition breaks, and the gas fills the whole volume. What is the change in internal energy? a delta(U) = 0 b delta(U) = Q c delta(U) = delta(H) 9 A rigid, insulated container of volume 𝑉 is split by a negligible partition. One side has 𝑛 moles of an ideal gas at 𝑇_𝑖; the other is a vacuum. The partition breaks, and the gas fills the whole volume. What will be the final temperature? a 𝑇_𝑖 b 2𝑇_𝑖 c 𝑇_𝑖 / nCv 10 True or False: Vaporization of liquid water into steam in a rigid container produces zero expansion work. a True b False c Not enough information 11 True or False: Heating of an ideal gas in a rigid, sealed container produces zero expansion work. a True b False c Not enough information 12 True or False: Expansion of an ideal gas into a vacuum, doubling its volume, produces zero expansion work. a True b False c Not enough information 13 A fluid passes through a valve, causing its pressure to drop without any heat transfer or work interaction. The process is best described as a _____. a steady-state flow process b unsteady-state flow process c quasi-flow process 14 Which of the following statements about a throttling process is TRUE? a The enthalpy of the fluid remains constant. b The process occurs in a closed system. c The process involves significant shaft work. 15 A continuous stirred-tank reactor (CSTR) carries out an exothermic reaction. The reactor has no cooling jacket, and the impeller rotates to mix the contents. In the energy balance, which assumption about shaft work is valid? a Shaft work is negligible. b Shaft work equals the heat released. c Shaft work is the main energy contributor. 16 An ideal gas undergoes a pressure change from 𝑝_1 to 𝑝_2 in two different processes: Isothermal (constant temperature) Isochoric (constant volume) Which statement about the entropy change of the gas is correct? a The entropy changes for the two processes have opposite signs. b The entropy change is the same for both processes. c The entropy change is zero for both processes. 17 Which of the following statements about work and reversible processes is TRUE? a A reversible process places an upper limit on the work done by a work-producing process. b The efficiency of a reversible process is 1. c A reversible process places a lower limit on the work done by a work-producing process. 18 Which of the following statements about a Carnot engine is FALSE? a The temperature increases during the adiabatic expansion step. b Heat enters the engine during the isothermal expansion at the high temperature. c Heat is rejected from the engine during the isothermal compression at the low temperature. 19 When a liquid is cooled, its molecules become more ordered, so its entropy decreases. Why does this not violate the second law of thermodynamics? a The entropy increase of the surroundings is larger than the decrease of the liquid’s entropy. b The liquid’s entropy actually increases. c The second law only applies to the surroundings. 20 True or False: dH = TdS + Vdp is a fundamental property relation. a True b False c Neither 21 True or False: U = TS − pV is a fundamental property relation. a False b True c 22 True or False: G = U + pV − TS is a fundamental property relation. a False b True c 23 Which residual property serves as a generating function for calculating other residual properties of a real gas? a Gibbs energy b Enthalpy c Hemholtz energy 24 A driver accidentally puts unleaded gasoline in a diesel car and starts driving. Which sequence of events is most likely to occur? a Gasoline’s lower flash point may cause early ignition, leading to piston or injector damage. b The engine will run normally, but fuel economy will improve. c The engine will stall immediately, but no long-term damage will occur. 25 True or False: The Linde process relies only on the Joule-Thomson effect, while the Claude process uses both the Joule-Thomson effect and mechanical expansion for greater efficiency. a True b False c Neither 26 True or False: In a Rankine cycle, superheating increases the average temperature of heat addition, resulting in a higher thermal efficiency. a True b False c Neither 27 Conceptually, as evaporator temperature decreases while condenser temperature is fixed, the COP decreases because the ______. a compressor requires more work for less cooling b cycle approaches the Carnot ideal c temperature difference between heat addition and rejection becomes smaller 28 The thermal efficiency of a Brayton cycle mainly depends on the turbine inlet temperature and the pressure ratio across the compressor. a True b False c Neither

Thermodynamics I Quiz

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Thermodynamics I QuizVersion en ligne

par Marj B

The triple point on a p–T diagram is represented by a/an _____

The triple point on a p–V diagram is represented by a/an _____

Which law relates internal energy change to heat and work?

In a closed system, energy transfer as heat or work changes the system's what?

The validity of thermodynamic laws relies on ______.

A rigid container holds a saturated liquid substance. If the substance is cooled while the volume remains constant, what state will the substance be in afterward?

A rigid, insulated container of volume 𝑉 is split by a negligible partition. One side has 𝑛 moles of an ideal gas at 𝑇_𝑖; the other is a vacuum. The partition breaks, and the gas fills the whole volume. What is the work done?

A rigid, insulated container of volume 𝑉 is split by a negligible partition. One side has 𝑛 moles of an ideal gas at 𝑇_𝑖; the other is a vacuum. The partition breaks, and the gas fills the whole volume. What is the change in internal energy?

A rigid, insulated container of volume 𝑉 is split by a negligible partition. One side has 𝑛 moles of an ideal gas at 𝑇_𝑖; the other is a vacuum. The partition breaks, and the gas fills the whole volume. What will be the final temperature?

True or False: Vaporization of liquid water into steam in a rigid container produces zero expansion work.

True or False: Heating of an ideal gas in a rigid, sealed container produces zero expansion work.

True or False: Expansion of an ideal gas into a vacuum, doubling its volume, produces zero expansion work.

A fluid passes through a valve, causing its pressure to drop without any heat transfer or work interaction. The process is best described as a _____.

Which of the following statements about a throttling process is TRUE?

A continuous stirred-tank reactor (CSTR) carries out an exothermic reaction. The reactor has no cooling jacket, and the impeller rotates to mix the contents. In the energy balance, which assumption about shaft work is valid?

An ideal gas undergoes a pressure change from 𝑝_1 to 𝑝_2 in two different processes: Isothermal (constant temperature) Isochoric (constant volume) Which statement about the entropy change of the gas is correct?

Which of the following statements about work and reversible processes is TRUE?

Which of the following statements about a Carnot engine is FALSE?

When a liquid is cooled, its molecules become more ordered, so its entropy decreases. Why does this not violate the second law of thermodynamics?

True or False: dH = TdS + Vdp is a fundamental property relation.

True or False: U = TS − pV is a fundamental property relation.

True or False: G = U + pV − TS is a fundamental property relation.

Which residual property serves as a generating function for calculating other residual properties of a real gas?

A driver accidentally puts unleaded gasoline in a diesel car and starts driving. Which sequence of events is most likely to occur?

True or False: The Linde process relies only on the Joule-Thomson effect, while the Claude process uses both the Joule-Thomson effect and mechanical expansion for greater efficiency.

True or False: In a Rankine cycle, superheating increases the average temperature of heat addition, resulting in a higher thermal efficiency.

Conceptually, as evaporator temperature decreases while condenser temperature is fixed, the COP decreases because the ______.

The thermal efficiency of a Brayton cycle mainly depends on the turbine inlet temperature and the pressure ratio across the compressor.