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Why entropy change for a reversible adiabatic process is zero ?

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ds= dq/T . In a adiabatic process dq=o .therefore ds=0
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For reversible process entropy change (?S)=?Q/T where ?Q=heat transfer to the system at boundary Temple T....and we know ?Q=0 for adiabatic so ?S=0
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LEARNING IS FUN !!

Entropy change is associated solely with HEAT TRANSFER. Reversible Adiabatic process is process with no heat transfer.Hence, Entropy is zero.Therefore,it is also called isentropic process.(same entropy )
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Chemistry is my best subject

Entropy is state function. Gain of energy will be equal to loss of energy
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Sir I want to prepare for gate from now..how I should prepare for it and when what books I should refer..??
Don't worry I am always there to help you prepare for the GATE entrance exam. All you need to do is to contact me through UrbanPro and let me know your requirements. Thank you and wish you all the best for your future career.
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What are the important books for GATE in ece?
My suggestion is that first take up previous 25 years of GATE questions and start preparing subject by subject. Any standard book which you studied your Engineering sufficient.
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GATE ME 2016 online classes from 17th March 2015. For more details, please feel free to contact.
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Do all the engineering streams have the same syllabus for first semester?
Almost same except Architecture. However, Some subjects are interchanged between 1st sem and 2nd sem for some departments.
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When is right time to start preparing for GATE to secure AIR 1 in ECE? I am in my 2nd year of B.Tech.
to secure Rank 1 u hv to learn from second year whatever u r learning learn it in deep and in third year start practice on it
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