A mould cracks after drying. It indicates
A.excess of clay
B.lack of clay
C.coarse irregular grains
D.none of the above
Category: Foundry Technology Mcqs
Pattern maker’s contraction rules are
A.different for different materials of patterns
B.different for different materials of castings
C.same for all materials of castings
Which statement is not true for green sand moulding?
A.Moulds are cheapest
B.Preparation of moulds is less time consuming
C.Defect free and castings with good surface is obtained
D.none of the above
Which of the following metal can be cast in plaster moulds?
A.Yellow brass
B.Manganese
C.Aluminium bronzes
D.All of the above
Polystyrene is generally available in the form of
A.plates
B.cylindrical bars
C.square sections
D.trapezoidal moulds
On drying the shrinkage of wood is least
A.along the grains
B.across the grains
C.along the direction of tangent to the annular rings
Average amount of sand required in a foundry for making one tonne of casting is nearly
A.0.1 tonne
B.0.2 tonne
C.2 tonnes
D.20 tonnes
Casting made in relatively simple shapes and designed for subsequent fabrication by rolling, forging etc. are known as
A.rolls
B.chills
C.ingots
D.pigs
Flash occurs on diecastings at the
A.parting surface of two dies
B.vents between the dies
C.ejection pins
D.gatting system
Tin coated low carbon steel chaplets are used in
A.ferrous foundries
B.non-ferrous foundries
C.both (A) and (B) above
