41.
The diaphragm moulding machine is used to

42.
In a centrifugal casting method

43.
The temperature of the inner luminous cone of neutral flame is about

44.
The acetylene cylinder is usually painted with

45.
The oxygen cylinder is usually painted with

46.
The operation of cutting a cylindrical hole in a sheet of metal by the punch and die is called

48.
The electrode tip diameter (d) in spot welding should be equal to (where t = Thickness of plate to be welded)

49.
Which of the following statement is wrong?

50.
Which of the following statement is wrong?

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