Materials Science and Manufacturing Engineering Miscellaneous

Materials Science and Manufacturing Engineering Miscellaneous

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Materials Science and Manufacturing Engineering

Materials Science and Manufacturing Engineering Miscellaneous
  1. A. CNC1. Zero inventory
    B. MRP2. Rout sheet
    C. JIT3. DNC
    D. FMS4. Cutter path
    5. Lumped demand








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    A – 4, B – 5, C – 1, D–3.
    CNC - Cutter path.
    MRP - Lumped demand.
    JIT - Zero inventory
    FMS - DNC.

    Correct Option: C

    A – 4, B – 5, C – 1, D–3.
    CNC - Cutter path.
    MRP - Lumped demand.
    JIT - Zero inventory
    FMS - DNC.

  1. A DC servomotor is directly driving an NC table. The pitch of the lead screw of the table is 5 mm. The motor rotates at 100 rpm for an applied voltage of 10 V. If the voltage speed characteristic of the motor is linear, the applied voltage for a table of 3 m/min is equal to








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    Motor speed = 10 rpm.
    Distance = travelled on
    Lead screw = 5 mm.
    Line for one revolution = 1/100 min.
    Speed of motion on lead serew

    =
    5
    		= 500 mm/ min.
    1
    100

    Considering line characteristic of 0.5m/min to get travel speed of 3m/min, we have to increase the voltage by
    =
    3
    		= 6 times
    0.5

    i.e. 10 × 6 = 60 V

    Correct Option: B

    Motor speed = 10 rpm.
    Distance = travelled on
    Lead screw = 5 mm.
    Line for one revolution = 1/100 min.
    Speed of motion on lead serew

    =
    5
    		= 500 mm/ min.
    1
    100

    Considering line characteristic of 0.5m/min to get travel speed of 3m/min, we have to increase the voltage by
    =
    3
    		= 6 times
    0.5

    i.e. 10 × 6 = 60 V

  1. Control of group of NC machine by a supervisory computer is known as... control.








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    DNC (Distributed numerical control)

    Correct Option: A

    DNC (Distributed numerical control)

  1. Feed motion can be provided with stepper motors in CNC








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    In PTP type motion like in drilling, stepper motors could be used.

    Correct Option: B

    In PTP type motion like in drilling, stepper motors could be used.

  1. A 2(1/2 ) axis control in a typical CNC machine provides








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    programmable movement along 3 axes but allow simultaneous movement along 2 axes

    Correct Option: B

    programmable movement along 3 axes but allow simultaneous movement along 2 axes