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GATE Past Year Questions: Properties of Pure Substances | Thermodynamics - Mechanical Engineering PDF Download
Question for GATE Past Year Questions: Properties of Pure Substances
Try yourself:2 moles of oxygen are mixed adiabatically with another 2 moles of oxygen in a mixing chamber, so that the final total pressure and temperature of the mixtures become same as those of the individual constituents at their initial states.The universal gas constant is given as R. The change in entropy due to mixing, per mole of oxygen, is given by
[2008]
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Question for GATE Past Year Questions: Properties of Pure Substances
Try yourself:Water has a critical specific volume of 0.003155 m3/kg. A closed and rigid steel tank of volume 0.025 m3 contains a mixture of water and steam at 0.1 MPa. The mass of the mixture is 10 kg. The tank is now slowly heated. The liquid level inside the tank
[2007]
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Question for GATE Past Year Questions: Properties of Pure Substances
Try yourself:Which combination of the following statements is correct?
P : A gas cools upon expansion only when its Joule-Thomson coefficient is positive in the temperature range of expansion.
Q : For a system undergoing a process, its entropy remains constant only when the process is reversible.
R : The work done by a closed system in an adiabatic is a point function.
S : A liquid expands upon freezing when the slope of its fusion curve on pressureTemperature diagram is negative.
P : A gas cools upon expansion only when its Joule-Thomson coefficient is positive in the temperature range of expansion.
Q : For a system undergoing a process, its entropy remains constant only when the process is reversible.
R : The work done by a closed system in an adiabatic is a point function.
S : A liquid expands upon freezing when the slope of its fusion curve on pressureTemperature diagram is negative.
[2007]
WView Solution
Question for GATE Past Year Questions: Properties of Pure Substances
Try yourself:When wet steam flows through a throttle valve and remains wet at exit
[1996]
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Question for GATE Past Year Questions: Properties of Pure Substances
Try yourself:Constant pressure lines in the superheated region of the Mollier diagram will have
[1995]
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Question for GATE Past Year Questions: Properties of Pure Substances
Try yourself:Which one of the following statements is correct for a superheated vapour?
[2018,Set-1]
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Question for GATE Past Year Questions: Properties of Pure Substances
Try yourself:The INCORRECT statement about the characteristics of critical point of a pure substance is that
[2016,Set-3]
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Question for GATE Past Year Questions: Properties of Pure Substances
Try yourself:A rigid container of volume 0.5 m3 contains 1.0 kg of water at 120°C (vf = 0.00106 m3/kg, vg = 0.8908 m3/kg). The state of water is
[2015,Set-3]
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Question for GATE Past Year Questions: Properties of Pure Substances
Try yourself:At the triple point of a pure substance, the number of degrees of freedom is
[1993]
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Question for GATE Past Year Questions: Properties of Pure Substances
Try yourself:During the phase change of a pure substance
[1993]
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FAQs on GATE Past Year Questions: Properties of Pure Substances - Thermodynamics - Mechanical Engineering
| 1. What are the properties of pure substances in mechanical engineering? |  |
Ans. Properties of pure substances in mechanical engineering refer to the characteristics that define the behavior of substances, such as water or refrigerants, under various conditions. These properties include specific volume, specific enthalpy, specific entropy, specific internal energy, and temperature.
| 2. How is specific volume defined for pure substances in mechanical engineering? | |
Ans. Specific volume is the ratio of the volume of a substance to its mass. In mechanical engineering, it is expressed as the volume occupied by one unit mass of a substance. It is denoted by the symbol "v" and is typically measured in cubic meters per kilogram (m^3/kg).
| 3. What is the significance of specific enthalpy in the study of pure substances in mechanical engineering? | |
Ans. Specific enthalpy is a property that represents the energy content of a unit mass of a substance. It accounts for both the internal energy and the flow work associated with the substance. In mechanical engineering, specific enthalpy is particularly important in thermodynamic analysis, as it helps determine the amount of heat transfer or work done during a process.
| 4. How is specific entropy useful in the analysis of pure substances in mechanical engineering? | |
Ans. Specific entropy is a property that measures the level of disorder or randomness in a unit mass of a substance. It provides insights into the changes in the entropy of a substance during processes such as heat transfer or phase transitions. In mechanical engineering, specific entropy plays a crucial role in determining the efficiency of thermodynamic systems and the irreversibility of processes.
| 5. Why is temperature considered a key property of pure substances in mechanical engineering? | |
Ans. Temperature is a fundamental property that characterizes the thermal state of a substance. In mechanical engineering, it is vital for analyzing and predicting the behavior of pure substances in various thermodynamic processes. Temperature influences the direction and rate of heat transfer, as well as the phase changes and equilibrium conditions of substances. It serves as a basis for designing efficient heat exchange systems and understanding the thermal performance of mechanical devices.
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