The defect known as ‘drop’ occurs when the upper surface of the mould cracks and pieces of sand fall into the molten metal. This defect occurs due to
A.low mould hardness
B.insufficient reinforcement
C.low green strength
D.any of the above
Category: Foundry Technology Mcqs
Presence of sulphur in cast iron
A.retards fluidity
B.promotes brittleness
C.promotes oxidation
D.all of the above
Thermal efficiency of cupola is in the range
A.80 to 90 percent
B.60 to 75 percent
C.50 to 65 percent
D.30 to 50 percent
Graphitic cast iron is
A.hard
B.non-machinable
C.high in compressive strength
D.low in damping capacity
Contraction allowance for grey cast iron is (in mm/m)
A.30
B.10.5
C.21
Investment casting is also known as
A.lost wax casting
B.lost pattern casting
C.hot investment casting
D.any of the above
Lowest pouring temperature alloy is
A.Tin bronze
B.Phosphor bronze
C.Monel metal
D.Cupro nickel alloy
Pneumatic tools find application in foundries normally for
A.fin removal
B.surface finish
C.filling of cavities
D.none of the above
The hardness of the mould is affected by the proportion of ingredients in the sand and
A.the temperature
B.refractoriness
C.degree of ramming
D.shape of particles
The location of riser least depends on
A.the metal to be cast
B.the size of core
C.design of casting
D.feasibility of directional solidification
