Which of the following is the correct statement of the second law of thermodynamics?

A. It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.

B. It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source.

C. There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy.

D. All of the above

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. Which of the following statement is incorrect?
  2. The pull required to crush the rivet per pitch length is
  3. A fletched beam is used to
  4. The section modulus of a circular section about an axis through its C.G., is
  5. The pull required to tear off the plate per pitch length is (where p = Pitch of rivets, t = Thickness…
  6. A simply supported beam with a gradually varying load from zero at B and w per unit length at A is shown…
  7. If the value of n = 0 in the equation pvn = C, then the process is called
  8. Diamond riveted joint can be adopted in the case of following type of joint
  9. According to Kelvin-Planck's statement of second law of thermodynamics,
  10. Select the wrong statement
  11. When a body is subjected to three mutually perpendicular stresses, of equal intensity, the ratio of…
  12. The radius of the Mohrs circle in the given figure is equal to
  13. Which of the following materials is most elastic?
  14. During which of the following process does heat rejection takes place in Carnot cycle?
  15. An isothermal process is governed by
  16. Which of the following statement is incorrect?
  17. The __________ is obtained when carbonisation of coal is carried out at 500° to 700° C.
  18. The amount of heat required to raise the temperature of 1 kg of water through one Kelvin is called
  19. The ratio of elongation in a prismatic bar due to its own weight (W) as compared to another similar…
  20. The value of one bar (in S. I. units) is equal to
  21. In an irreversible process, there is a
  22. When the gas is heated at constant pressure, the heat supplied
  23. An open cycle gas turbine works on
  24. Impact strength of a material is an index of its
  25. For a beam, as shown in the below figure, when the load W is applied in the centre of the beam, the…
  26. The general law of expansion or compression is pvn = C, The process is said to be hyperbolic, if n is…
  27. Percentage reduction in area performing tensile test on cast iron may be of the order of
  28. The ratio of maximum shear stress developed in a rectangular beam and a circular beam of the same cross-sectional…
  29. Which of the following is the correct statement?
  30. When a closely-coiled helical spring of mean diameter (D) is subjected to an axial load (W), the stiffness…