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Mechanical Engineering :: Workshop Technology

  1. The diaphragm moulding machine is used to

  2. A.

     Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould

    B.

     Ram the sand harder at the back of the mould and softer on the pattern face

    C.

     Produce uniform packing of sand in the mould

    D.

     Give uniform sand hardness throughout the mould


  3. In a centrifugal casting method

  4. A.

     Core is made of sand

    B.

     Core is made of ferrous metal

    C.

     Core is made of nonferrous metal

    D.

     No core is used


  5. The temperature of the inner luminous cone of neutral flame is about

  6. A.

     1000°C

    B.

     1250°C

    C.

     2100°C

    D.

     3200°C


  7. The acetylene cylinder is usually painted with

  8. A.

     Black colour

    B.

     White colour

    C.

     Maroon colour

    D.

     Yellow colour


  9. The oxygen cylinder is usually painted with

  10. A.

     Black colour

    B.

     White colour

    C.

     Maroon colour

    D.

     Yellow colour


  11. The operation of cutting a cylindrical hole in a sheet of metal by the punch and die is called

  12. A.

     Shearing

    B.

     Piercing

    C.

     Punching

    D.

     Blanking


  13. A moving mandrel is used in

  14. A.

     Wire drawing

    B.

     Tube drawing

    C.

     Metal cutting

    D.

     Forging


  15. The electrode tip diameter (d) in spot welding should be equal to (where t = Thickness of plate to be welded)

  16. A.

     √t

    B.

     1.5 t

    C.

     3 t

    D.

     6 t


  17. Which of the following statement is wrong?

  18. A.

     The hot chamber die casting machine is used for casting zinc, tin, lead and other low melting alloys.

    B.

     The cold chamber die casting machine is used for casting aluminium, magnesium, copper base alloys and other high melting alloys.

    C.

     The castings produced by centrifugal casting method have open and coarse grained structure.

    D.

     All of the above


  19. Which of the following statement is wrong?

  20. A.

     The angular clearance on dies varies from 0.5° to 1°

    B.

     In drawing operation, the metal flows due to plasticity

    C.

     In press operation, the size of the pierced hole is independent of the size of punch

    D.

     None of the above