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GATE Past Year Questions: Availability & Irreversibility | Thermodynamics - Mechanical Engineering PDF Download

Question for GATE Past Year Questions: Availability & Irreversibility
Try yourself:A heat reservoir at 900 K is brought into contact with the ambient at 300 K for a short time. During this period 9000 kJ of heat is lost by the heat reservoir. The total loss in availability due to this process is

[1995]

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Question for GATE Past Year Questions: Availability & Irreversibility
Try yourself:Availability of a system at any given state is

[2000]

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Question for GATE Past Year Questions: Availability & Irreversibility
Try yourself:Considering the relationship TdS = dU + pdV between the entropy (S), internal energy (U), pressure (p), temperature (T) and volume (V), which of the following statements is correct?

[2003]

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Question for GATE Past Year Questions: Availability & Irreversibility
Try yourself:A steel billet of 2000 kg mass is to be cooled from 1250 K to 450 K. The heat released during this process is to be used as a source of energy. The ambient temperature is 303 K and specific heat of steel is 0.5 kJ/kgK. The available energy of this billet is

[2004]

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Question for GATE Past Year Questions: Availability & Irreversibility
Try yourself:The pressure, temperature and velocity of air flowing in pipe are 5 bar, 500 K and 50 m/s, respectively. The specific heats of air at a constant pressure and at constant volume are 1.005 kJ/kgK and 0.718 kJ/kgK, respectively.Neglect potential energy. If the pressure and temperature of the surroundings are 1 bar and 300 K, respectively, the available energy in kJ/ kg of the air stream is

[2013]

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Question for GATE Past Year Questions: Availability & Irreversibility
Try yourself:The maximum theoretical work obtainable, when a system interacts to equilibrium with a reference environment, is called

[2014]

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FAQs on GATE Past Year Questions: Availability & Irreversibility - Thermodynamics - Mechanical Engineering

1. What is the meaning of availability in the context of mechanical engineering?
Ans. Availability in the context of mechanical engineering refers to the ability of a system or component to perform its intended function at a given point in time. It is a measure of the readiness of the system or component to deliver its required performance when needed.
2. How is irreversibility defined in mechanical engineering?
Ans. In mechanical engineering, irreversibility refers to the loss or dissipation of energy within a system or process that cannot be recovered or reused. It is accompanied by an increase in entropy, indicating the degradation or decrease in the quality of energy.
3. What are some common examples of irreversible processes in mechanical engineering?
Ans. Some common examples of irreversible processes in mechanical engineering include friction between moving parts, heat transfer through a temperature gradient, and fluid flow with pressure drop. These processes lead to energy losses and irreversibilities within the system.
4. How does availability relate to irreversibility in mechanical engineering?
Ans. The concept of availability in mechanical engineering is closely related to irreversibility. Irreversible processes within a system result in energy losses, reducing the availability of the system. Therefore, minimizing irreversibilities is essential to improve the availability and efficiency of mechanical systems.
5. What are some strategies to reduce irreversibilities and improve availability in mechanical systems?
Ans. Some strategies to reduce irreversibilities and improve availability in mechanical systems include optimizing component design to minimize friction and energy losses, using efficient heat transfer mechanisms, employing proper lubrication techniques, and implementing control systems to optimize system performance. Additionally, regular maintenance and monitoring can help identify and rectify any sources of irreversibility to enhance system availability.
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