Home / GATE 2017-2018 / GATE Metallurgical :: Practice Test Paper 2

GATE 2017-2018 :: GATE Metallurgical

  1. Degree and order of the differential equation d2y/dx2 + 3 dy/dx - 6y = 0, respectively, are
  2. A.
    1 and 2
    B.
    2 and 1
    C.
    1 and 1
    D.
    2 and 2

  3. As the concentration of point defects in a crystal increases, its configurational entropy
  4. A.
    does not change
    B.
    increases
    C.
    initially increases and then decreases

  5. In a binary system A-B, εAA, εBB and εAB correspond to A-A, B-B and A-B bond energies respectively. The miscibility gap will occur if
  6. A.
    εAB > 1/2 (εAA + εBB)
    B.
    εAB < 1/2 (εAA + εBB)
    C.
    εAB = 1/2 (εAA + εBB)
    D.
    εAB < 1/4 (εAA + εBB)

  7. Critical value of the Gibbs energy of nucleation at equilibrium temperature is
  8. A.
    zero
    B.
    infinite
    C.
    positive
    D.
    negative

  9. With respect to the matrix of Al-Cu alloys, G-P zones are
  10. A.
    coherent
    B.
    incoherent
    C.
    semi-coherent
    D.
    chemically indistinguishable

  11. Which one of the following techniques does NOT require quenching to obtain final case hardness?
  12. A.
    Flame hardening
    B.
    Induction hardening
    C.
    Nitriding
    D.
    Carburizing

  13. Which one of the following elements is an austenite stabilizer?
  14. A.
    Nitrogen
    B.
    Molybdenum
    C.
    Vanadium
    D.
    Tungsten

  15. A 0.2 wt.% plain carbon steel sheet is heated and equilibrated in the inter-critical region followed by instant water quenching. The microstructure of the quenched steel sheet consists of
  16. A.
    fully martensite
    B.
    proeutectoid ferrite + martensite
    C.
    martensite + pearlite
    D.
    martensite + austenite

  17. As compared to the engineering stress-engineering strain curve, the true stress-true strain curve for a given material
  18. A.
    lies above and to the left
    B.
    lies below and to the right
    C.
    crosses the engineering stress-engineering strain curve
    D.
    is identical

  19. Which one of the following does NOT improve fatigue life of a steel component?
  20. A.
    Nitriding
    B.
    Decarburization
    C.
    Improving surface finish
    D.
    Shot-peening