For stress relieving, castings are
A.heated to low temperature and furnace cooled
B.heated by flame and air cooled
C.heated to a temperature around melting point and slowly cooled
D.heated in stages and also cooled in stages
Category: Foundry Technology Mcqs
In furan moulding which of the following is used as a catalyst?
A.Ammonium hydroxide
B.Potassium hydroxide
C.Phosphoric acid
D.Phenol formaldehyde
In small castings which of the following allowance can be ignored?
A.Shrinkage allowance
B.Rapping allowance
C.Draft allowance
D.Machining allowance
Wood used for pattern making has knots. This is likely to affect
A.warping of the piece
B.machinability of pattern
C.moisture content of wood
D.all of the above
Which of the following facilitates shaking and lifting large pattern from the mould?
A.Trowel
B.Swab
C.Bellows
D.Ripping plate
Consumable patterns are made of
A.polystyrene
B.wax
C.plaster of paris
D.any of the above
Sprues are generally
A.uniform size
B.tapered downwards
C.tapered upwards
In case of cast steel, the contraction allowance will be least for castings having dimensions
A.upto 600 mm
B.600 to 1000 mm
C.1000 mm to 1800 mm
D.above 1800 mm
Gold melts at
A.1063?C
B.1444?C
C.2100?C
D.3300?C
A drawback is employed when
A.the pattern is too bulky
B.the pattern is too long
C.the pattern cannot be drawn from mould due to projection
D.the pattern is not made of wood
