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Solution to Previous Year Exam Questions for Thermodynamics - TD of by Shibasis Tripathy

  • Thermodynamics - TD
  • 2018
  • PYQ Solution
  • Silicon Institute of Technology - SIT-SBP
  • Mechanical Engineering
  • B.Tech
  • Uploaded 9 months ago
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Module 1- Thermodynamics 1. An isentropic process is always: a) Reversible and adiabatic b) Frictionless c) Reversible and isothermal d) Irreversible and adiabatic (Ans) In a isentropic process entropy remains constant, i.e. change in entropy is Zero, which is only possible in a reversible and adiabatic process. 1

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2. Among the following which is not property of the system? a) Pressure b) Temperature c) Heat d) Specific volume (Ans) o Extensive properties are not property of the system. o Pressure, Temperature, Specific volume are intensive properties. o Extensive properties depends upon mass. o Heat and work are extensive properties. o Heat and work are path function (inexact differential) 3. The efficiency of the Carnot engine …………………., if the temperature of the source is increased. a) Does not change other factors b) Increases c) Decreases 4. On what does the efficiency of an ideal Carnot engine depends? a) The working substance b) The construction of engine c) The temperature of the sink only d) The temperatures of both the source and the sink 2 d) Depends on

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(Ans) Efficiency of an ideal Carnot engine depends only on source and sink temperature. 5. What do the second law of thermodynamics defines? a) Heat b) Work c) Entropy (Ans) From 1st Law, we get internal energy, from 2nd law we get entropy, from zeroth law we get temperature. 6. In free expansion process, work done is……………….. (Ans) 3 d) Internal energy

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7. First law of thermodynamics sates that………………… (Ans) MODULE- 2 Introduction to Fluid Mechanics and Heat transfer 8. According to Newton's law of cooling, the heat transfer from a hot body to a cold body is A. directly proportional to the surface area B. directly proportional to the difference of temperatures between the two bodies C. either (a) or (b) D. both (a) and (b) 4

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