For which one of the following processes, a wax pattern is required-
centrifugal casting
investment casting
shell moulding
gravity die casting
A fusible alloy used in brazing is known as
flux
slag
spelter
brazer
Solder has the following composition
lead and tin
tin and copper
lead and copper
lead and iron
Thermit welding is a mixture of
When oxygen and acetylene gas are mixed in equal proportions, what type of flame is produced
oxidising flame
carburizing
neutral flame
none
Which type of flame is produced by burning excessive acetylene
neutral flame
carburizing
oxidising
reducing
In the metal joining process joined
one metal to other metal
one metal only
both of the above
none of the above
Which process has a chemical reaction
arc welding
resistance welding
gas welding
beam welding
The pattern cannot be reused in
centrifugal casting
investment casting
shell casting
gravity die casting
Swell is the casting defect due to
less ramming
excess ramming
dry sand
inadequate feeding
A defect which can be caused due to the low strength of mold is
blow holes
sand wash
pin holes
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