Feb 28

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1. What is the importance of the Thermodynamics in the field of Mechanical Engineering?
All the mechanical engineering systems are studied with the help of thermodynamics. Hence it is very important for the mechanical engineers.

2. How many Laws of Thermodynamics are there?
There are three laws of the thermodynamics.

First Law: Energy can be neither created nor destroyed. It can only change forms.In any process in an isolated system, the total energy remains the same.

Second Law: When two isolated systems in separate but nearby regions of space, each in thermodynamic equilibrium in itself, but not in equilibrium with each other at first, are at some time allowed to interact, breaking the isolation that separates the two systems, and they exchange matter or energy, they will eventually reach a mutual thermodynamic equilibrium. The sum of the entropies of the initial, isolated systems is less than or equal to the entropy of the final exchanging systems. In the process of reaching a new thermodynamic equilibrium, entropy has increased, or at least has not decreased.

Third Law: As temperature approaches absolute zero, the entropy of a system approaches a minimum.

3. State Laws of conservation of energy?
According to the laws of conservation of energy, “energy can neither be created nor be destroyed. It can only be transformed from one form to another.”

4. Is the boiler a closed system?
Yes definitely the boiler is a closed system.

5. What is Carnot engine?
It was being designed by Carnot and let me tell you that Carnot engine is an imaginary engine which follows the Carnot cycle and provides 100% efficiency.

6. Which formula forms a link between the Thermodynamics and Electro chemistry?
Gibbs Helmholtz formula is the formula which forms the link between the thermodynamics and electromagnetism.

∆Hs/R = [∂ lnp /∂ (1/T)]x

where: x – mole fraction of CO2 in the liquid phase
p – CO2 partial pressure (kPa)
T – temperature (K)
R – universal gas constant
α – mole ratio in the liquid phase (mole CO2 per mole of amine)

7. Which is the hardest compound known?

8. What is Hess Law?
According to the Hess law the energy transfer is simply independent of the path being followed. If the reactant and the product of the whole process are the same then same amount of energy will be dissipated or absorbed.

9. Which has more efficiency: Diesel engine or Petrol engines?
Off course Diesel engine has the better efficiency out of two.

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43 Responses to “Latest Interview Questions in Mechanical | Mechanical Engineering Interview Questions and Answers | Mechanical Engineer Job Interview Questions | Latest Placement Papers | Mechanical Engg Questions”

  1. Rahul says:

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  2. Ganesan says:

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  3. mehedi says:

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  4. rahis says:

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  5. muthu kumar samy says:

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  6. keen says:

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  9. siva says:

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  10. M.S.GANESH says:

    I need more questions and answer

  11. viresh says:

    attention plz……. no cycle can be 100% efficient. if it happens then it is clearly the violation of the thermodynamics 2nd law ( kelvin plank statement), as this law states” it is impossible to construct a device which while working in a cyclic manner would convert the heat into work completely without rejecting any amount of the heat to the sink.” 100% efficiency means that all the heat input is converted into work without any rejection of heat. it is a case of PMM2.
    this can also be understood in the way that efficiency of carnot cycle is given by the formula= 1-T2/T1, where T2= temperature of source, T1= temp of sink.

    • viresh says:

      carnot engine is the idealization of an engine and is completely reversible engine which have the higher efficiency than any other irreversible engine. also according to carnot theorem all the reversible engine have the same efficiency.

  12. chandan says:

    in interview all question come from main books branch paper … ya technical question plz reply me

  13. Krishna says:

    pls post any such sites which would provide useful information for gate aspirants….

  14. Nitesh says:

    this is very important for M.E.

  15. sudhakar says:

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  16. guna says:

    it is very useful for preparing placement

  17. sajjad says:

    it best ans in which all question paper

  18. satish kumar says:

    this system is very usefull aa me

  19. satish kumar says:

    this is mostimportent and very usefull in mach final year students

  20. satish kumar.K says:

    this is most importent and very usefull in mach final year students

  21. indira says:

    hello viresh your right all te revesible engines has same efficiency…but clause is ter they must operate at same temperature…and carnot engine is the hypothetical engine with which we used to compare remaining engines…

  22. vikasbindra says:

    good qestion thankyou for these questions

  23. student may ask any question being asked says:

    Any question you wana ask related to mechanical engineering ?

  24. himanshu says:

    difference between pressure and stress

  25. parmjeet says:


  26. siddharth mourya says:

    i want latest updates of interviews questions on my email id.

  27. harish says:

    stress is the resisting force within the body when it is subjected to load, but pressure is load acting per unit area.

  28. pratik says:

    Diamond is no more Hardest one. Wurtzite boron nitride, 18% stronger than diamond and lonsdaleite, a whopping 58% tougher (Hexagonal Diamond)

  29. ramesh says:

    what is the difference between strees and strain…

  30. diffrence between distance and isplacement

  31. Yudhisthir Baghel says:

    Nice work. This is very usefull for interviews.

  32. saikiran says:

    it is good for the students who is going to attend an interview……..thanx for provoiding this information to us……..

  33. mech engg says:

    dis is the mst necesary thing 4 mech enginers…..plz put up some mre variety of questions….

  34. varun vashisht says:

    Can anybody please post some questions about engines and turbines?

  35. SAAD says:

    the boiler is open system not close system but when it is become in a power plant with others part( condenser+pump+turbine) then all system will be close system

  36. saddam says:

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  37. jeevca says:

    ya its useful