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Mechanical Engineering Exam  >  Mechanical Engineering Notes  >  Thermodynamics  >  GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy

GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy | Thermodynamics - Mechanical Engineering PDF Download

Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:For an ideal gas with constant properties undergoing a quasi-static process, which one of the following represents the change of entropy (Δs) from state 1 to 2?

[2018, Set-2]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:Which one of the following pairs of equations describes an irreversible heat engine?

[2014, Set-3]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:An ideal gas of mass m and temperature T1 undergoes a reversible isothermal process from an initial pressure P1 to final pressure P2. The heat loss during the process is Q. The entropy change ΔS of the gas is

[2012]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:One kilogram of water at room temperature is brought into contact with a high temperature thermal reservoir. The entropy change of the universe is

[2010]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:If a closed system is undergoing an irreversible process, the entropy of the system

[2009]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:A system undergoes a State change from 1 to 2. According to the second law of thermodynamics, for the process to be feasible, the entropy change, S2 – S1 of the system

[1997]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:For an ideal gas the expression

GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy | Thermodynamics - Mechanical Engineering
is always equal to

[1997]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:One kilomole of an ideal gas is throttled from an initial pressure of 0.5 MPa to 0.1 MPa. The initial temperature is 300 K. The entropy change of the universe is

[1995]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:Which among the following relations is/are valid only for reversible process undergone by a pure substance?

[1993]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:A Carnot cycle is having an efficiency of 0.75. If the temperature of the high temperature reservoir is 727°C. What is the temperature of low temperature reservoir?

[2001]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:Consider a refrigerator and a heat pump working on the reversed Carnot cycle between the same temperature limits. Which of the following is correct?

[1995]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:The figure shows a heat engine (HE) working between two reservoirs. The amount of heat (Q2) rejected by the heat engine is drawn by a heat pump (HP). The heat pump receives the entire work out put (W) of the heat engine. If temperatures, T1 > T3 > T2, then the relation between the efficiency (η) of the heat engine and the coefficient and the coefficient of performance (COP) of the heat pump is
GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy | Thermodynamics - Mechanical Engineering

[2019, Set -2]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:A reversible heat engine receives 2 kJ of heat from a reservoir at 1000 K and a certain amount of heat from a reservoir at 800 K.It rejects 1 kJ of heat to a reservoir at 400 K.
The net work output (in kJ) of the cycle is

[2014, Set-1]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:Consider the following two processes;
I. A heat source at 1200 K loses 2500 kJ of heat to a sink at 800 K
II. A heat source at 800 K loses 2000 kJ of heat to a sink at 500 K
Which of the following statements is true?

[2010]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:An irreversible heat engine extracts heat from a high temperature source at a rate of 100 kW and rejects heat to a sink at a rate of 50 kW.The entire work output of the heat engine is used to drive a reversible heat pump operating between a set of independent isothermal heat reservoirs at 17°C and 75°C. The rate (in kW) at which the heat pump delivers heat to its high temperature sink is

[2009]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:A cyclic device operates between three thermal reservoirs, as shown in the figure. Heat is transferred to/from the cycle device. It is assumed that heat transfer between each thermal reservoir and the cyclic device takes place across negligible temperature difference.
Interactions between the cyclic device and the respective thermal reservoirs that are shown in the figure are all in the form of heat transfer.
GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy | Thermodynamics - Mechanical Engineering

The cyclic device can be

[2008]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:A heat transformer is device that transfers a part of the heat, supplied to it at an intermediate temperature, to a high temperature reservoir while rejecting the remaining part to a low temperature heat sink.In such a heat transformer, 100 kJ of heat is supplied at 350 K. The maximum amount of heat in kJ that can be transferred to 400 K, when the rest is rejected to a heat sink at 300 K is

[2007]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:A solar collector receiving solar radiation at the rate of 0.6 kW/m2 transforms it to the internal energy of a fluid at an overall efficiency of 50%. The fluid heated to 350 K is used to run a heat engine which rejects heat at 313 K.If the heat engine is to deliver 2.5 kW power, the minimum area of the solar collector required would be

[2004]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:A cycle heat engine does 50 kJ of work per cycle. If the efficiency of the heat engine is 75%. The heat rejected per cycle is

[2001]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:For two cycles coupled in series, the topping cycle has an efficiency of 30% and the bottoming cycle has an efficiency of 20%. The overall combined cycle efficiency is

[1996]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:A solar energy based heat engine which receives 80 kJ of heat at 100°C and rejects 70 kJ of heat to the ambient at 30°C is to be designed. The thermal efficiency of the heat engine is

[1996]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:When a system executes an irreversible cycle

[1994]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:A reversible heat transfer demands:

[1993]

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Question for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy
Try yourself:A condenser of a refrigeration system rejects heat at a rate of 120 kW, while is compressor consumes a power of 30 kW. The coefficient of performance of the system would be

[1992]

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FAQs on GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy - Thermodynamics - Mechanical Engineering

1. What is the second law of thermodynamics and why is it important?
Ans. The second law of thermodynamics states that in any natural process, the total entropy of a closed system always increases or remains constant. It is important because it helps us understand the direction of heat flow, the efficiency of energy conversion, and the limitations of various thermodynamic processes.
2. How does the Carnot cycle work and what is its significance in thermodynamics?
Ans. The Carnot cycle is a theoretical thermodynamic cycle that consists of four reversible processes: isothermal expansion, adiabatic expansion, isothermal compression, and adiabatic compression. It is significant because it represents the maximum efficiency that any heat engine can achieve operating between two given temperature reservoirs.
3. What is entropy and how does it relate to the second law of thermodynamics?
Ans. Entropy is a thermodynamic property that measures the level of disorder or randomness in a system. The second law of thermodynamics states that the entropy of an isolated system always tends to increase over time. This means that natural processes are characterized by an increase in entropy, leading to a decrease in the availability of energy to do useful work.
4. Can the second law of thermodynamics be violated?
Ans. No, the second law of thermodynamics is a fundamental principle that has been experimentally verified and holds true for all natural processes. It is considered a universal law of nature and cannot be violated.
5. How does the concept of entropy relate to everyday life and practical applications?
Ans. Entropy is a concept that extends beyond thermodynamics and has implications in various fields. In everyday life, entropy can be understood as a measure of disorder or chaos. It helps explain why things tend to naturally become disorganized over time. In practical applications, the concept of entropy is used in areas such as information theory, statistical mechanics, and engineering to optimize processes, improve efficiency, and understand the behavior of complex systems.
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Document Description: GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy for Mechanical Engineering 2024 is part of Thermodynamics preparation. The notes and questions for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy have been prepared according to the Mechanical Engineering exam syllabus. Information about GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy covers topics like and GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy Example, for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for GATE Past Year Questions: Second Law Of Thermodynamics, Carnot Cycle, And Entropy.
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