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GATE 2017-2018 :: GATE Production

  1. An ideal gas of mass m and temperature T1 undergoes a reversible isothermal process from an initial pressure P1 to final pressure P2. The heat loss during the process is Q. The entropy change ∆S of the gas is
  2. A.
    mR ln(P2/P1)
    B.
    mR ln(P1/P2)
    C.
    mR ln(P2/P1) - Q/T1
    D.
    zero

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  3. For an opaque surface, the absorptivity (α), transmissivity (t) and reflectivity (ρ) are related by the equation:
  4. A.
    α + ρ = t
    B.
    α + ρ + t = 0
    C.
    α + ρ = 1
    D.
    α + ρ = 0

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  5. Which one of the following configurations has the highest fin effectiveness?
  6. A.
    Thin, closely spaced fins
    B.
    Thin, widely spaced fins
    C.
    Thick, widely spaced fins
    D.
    Thick, closely spaced fins

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  7. Oil flows through a 200 mm diameter horizontal cast iron pipe (friction factor, f = 0.0225) of length 500 m. The volumetric flow rate is 0.2 m3/s. The head loss (in m) due to friction is (assume g = 9.81 m/s2)
  8. A.
    116.18
    B.
    0.116
    C.
    18.22
    D.
    232.36

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  9. In an interchangeable assembly, shafts of size   mate with holes of size . The maximum interference (in microns) in the assembly is
  10. A.
    40
    B.
    30
    C.
    20
    D.
    10

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  11. A CNC vertical milling machine has to cut a straight slot of 10 mm width and 2 mm depth by a cutter of 10 mm diameter between points (0, 0) and (100, 100) on the XY plane (dimensions in mm). The feed rate used for milling is 50 mm/min. Milling time for the slot (in seconds) is
  12. A.
    120
    B.
    170
    C.
    180
    D.
    240

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  13. Match the following metal forming processes with their associated stresses in the workpiece.
    Metal forming process   Type of stress
    1. Coining                             P. Tensile
    2. Wire Drawing                  Q. Shear
    3. Blanking                           R. Tensile and compressive
    4. Deep Drawing                 S. Compressive
  14. A.
    1-S, 2-P, 3-Q, 4-R
    B.
    1-S, 2-P, 3-R, 4-Q
    C.
    1-P, 2-Q, 3-S, 4-R
    D.
    1-P, 2-R, 3-Q, 4-S

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  15. During normalizing process of steel, the specimen is heated
  16. A.
    between the upper and lower critical temperature and cooled in still air.
    B.
    above the upper critical temperature and cooled in furnace.
    C.
    above the upper critical temperature and cooled in still air.
    D.
    between the upper and lower critical temperature and cooled in furnace.

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  17. In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate
  18. A.
    increases continuously.
    B.
    decreases continuously.
    C.
    decreases, becomes stable and then increases.
    D.
    increases, becomes stable and then decreases.

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  19. Which one of the following is NOT a decision taken during the aggregate production planning stage?
  20. A.
    Scheduling of machines
    B.
    Amount of labour to be committed
    C.
    Rate at which production should happen
    D.
    Inventory to be carried forward

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