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For the following questions answer them individually
In arc welding, eyes need to be protected against:-
intense glare
sparks
infra-red rays only
both infra-red rays and ultraviolet rays
The main criterion for selection of electrode diameter in arc welding is:-
materials to be welded
type of welding process
thickness of material
voltage used
Open circuit voltage for arc welding is of the order of:-
18 - 40 volts
40 - 95 volts
100 - 125 volts
130 - 170 volts
Which of the following is not a casting defect?
hot tear
blow hole
scab
decarburization
The chief advantage of die casting is:-
possibility of incorporating thick sections in small castings
casting of inserts is possible
wide tolerances are possible
high production rates are possible
For mounting several patterns at a time, which of the following type of pattern is used?
combined pattern
loose, piece pattern
sweep pattern
match plate pattern
Casting process is preferred for parts having ______.
a few details
many details
no details
non-symmetrical shape
Holes in parts which have been hardened by heat treatment can be finished to accurate size only by:-
drilling
boring
internal grinding
reaming
A grinding wheel gets glazed due to:-
wear of abrasive grains
wear of bond
breaking of abrasives
cracks in wheel
Which of the following is the not a natural abrasive?
Garnet
Emery
Borron-carbide
Corundum
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