Materials Science and Manufacturing Engineering Miscellaneous


Materials Science and Manufacturing Engineering Miscellaneous

Materials Science and Manufacturing Engineering

  1. The principle of material removal in Electrochemical machining is









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    NA

    Correct Option: B

    NA


  1. The process utilizing mainly thermal energy for removing material is









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    Machining by laser beam is achieved through thermo – optic interaction between the beam and work material.

    Correct Option: D

    Machining by laser beam is achieved through thermo – optic interaction between the beam and work material.



  1. The following four unconventional machining processes are available in a shop floor. The most appropriate one to drill a hole of square cross section of 6 mm × 6 mm and 25 mm deep is









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    EDM is most suitable process of square holes, intricate triangular holes etc.

    Correct Option: D

    EDM is most suitable process of square holes, intricate triangular holes etc.


  1. During the electrochemical machining (ECM) of iron (atomic weight = 56, valency = 2) at current of 1000 A with 90% current efficiency, the material removal rate was observed to be 0.26 cc/s. If Titanium (atomic weight = 48, valency = 3) is machined by the ECM process at the current of 2000 A with 90% current efficiency, the expected material removal rate in gm/s will be









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    MRR =
    AI
    ρZF

    0.26 =
    56 × 1000 × 0.9
    ρ × 2 × 96500

    ρ = 0.9956.
    Now,   Expected MRR =
    48 × 2000 × 0.9
    0.9956 × 3 × 96500

    = 0.30 gm/s

    Correct Option: C

    MRR =
    AI
    ρZF

    0.26 =
    56 × 1000 × 0.9
    ρ × 2 × 96500

    ρ = 0.9956.
    Now,   Expected MRR =
    48 × 2000 × 0.9
    0.9956 × 3 × 96500

    = 0.30 gm/s



  1. Match the following non-traditional machining processes with the corresponding material removal mechanisms:
    Machining process
    P. Chemical machining
    Q. Electro-chemical machining
    R. Electro-discharge machining
    S. Ultrasonic machining
    Mechanism of material removal
    1. Erosion
    2. Corrosive reaction
    3. lon displacement
    4. Fusion and vaporization









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    P – 2, Q – 3, R – 4, S – 1

    Correct Option: A

    P – 2, Q – 3, R – 4, S – 1