Adiabatic process: identify the correct defining properties An adiabatic process for a gas is characterized by no heat transfer; infer its implications for temperature and energy balance. Choose the correct option.
Mechanical Engineering
Thermodynamics
Difficulty: Easy
Choose an option
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ANo heat enters or leaves the gas
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BThe temperature of the gas changes
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CChange in internal energy equals mechanical work done
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DAll of the above
Answer
Correct Answer: All of the above
Explanation
ConceptAdiabatic process: Q = 0. From the first law, ΔU = Q − W (sign convention: W is work done by the system). With Q = 0, ΔU = −W (or equivalently, the change in internal energy equals the negative of work by the system; equals work on the system). Temperature generally changes when a gas compresses/expands adiabatically.
Why all are true(a) is the definition; (b) typically occurs in adiabatic expansion/compression; (c) follows directly from the first law with Q = 0.
Final AnswerAll of the above