In furan moulding which of the following is used as a catalyst?
A.Ammonium hydroxide
B.Potassium hydroxide
C.Phosphoric acid
D.Phenol formaldehyde
A.Ammonium hydroxide
B.Potassium hydroxide
C.Phosphoric acid
D.Phenol formaldehyde
A.Shrinkage allowance
B.Rapping allowance
C.Draft allowance
D.Machining allowance
A.warping of the piece
B.machinability of pattern
C.moisture content of wood
D.all of the above
A.Trowel
B.Swab
C.Bellows
D.Ripping plate
A.polystyrene
B.wax
C.plaster of paris
D.any of the above
A.uniform size
B.tapered downwards
C.tapered upwards
A.upto 600 mm
B.600 to 1000 mm
C.1000 mm to 1800 mm
D.above 1800 mm
A.1063?C
B.1444?C
C.2100?C
D.3300?C
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
A.less than that of the casting
B.same as that for the casting
C.more than that of the casting