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WorksheetsCasting
Total questions: 20
Worksheet time: 39mins
The low permeability in sand can cause which of the following defects in casting
Rough surface
Blow holes
Hot Tears
Drop
The distortion in casting cannot be prevented by
modification of casting design
modification of casting design
providing sufficient machining allowance to cover the distortion effect
providing proper shrinkage allowance
Which of the following is true in case of directional solidification?
all parts of a casting do not cool at the same time due to varying cross sections
The rate of heat loss varies to adjoining mould walls
The thinnest section solidify first and the riser solidify last
Which of the following is true about riser?
It permits the molten metal to rise above the highest point in the casting.
Filling up of mould cavity can be visually checked from it.
The casting solidifies directionally towards the riser
Which of the following is not a casting defect?
Swell
Hot Tears
Shrinkage
Hot Cracks
Which of the following is true for sand castings?
They cannot be used for pressure tight vessels
They are stronger than wrought products
They have lower density and poor strength
They have poor ductility
According to their use, which of the following is not a type of moulding sand?
Green Sand
Dry Sand
Loam Sand
Wet Sand
The function of cores in casting is to
form extended parts
form internal cavities
used for directional solidification
none of the above
In permanent mould casting, the molten metal is poured
under external pressure
under gravity
partially under gravity and partially under external
pressure
none of the above
Which of the true? In permanent mould casting, the moulds are usually coated with a refractory wash and then lamp black to
Reduce chilling effect
To prevent shrinkage
Facilitates the removal of casting
Which of the following is not true for permanent mould casting?
They are superior in hardness
can be used for pressure tight vessel (upto 15 Kgf/cm2)
can be used for large size castings
not suitable for alloys of high temperature
In semi permanent mould casting
metallic core is used
sand core is used
wooden core is used
no core is used
In hot chamber die casting machine
melting unit is an integral part of machine
It is used for high melting (above 500°C) alloys
No pressure is used for forcing the metal inside the
die
None of the above
In cold chamber die casting machine
melting unit is an integral part of machine
melting chamber is an external part of machine
melting chamber can be placed anywhere
low pressure is required to force the molten metal into
the die casting
Which of the following is true for die used in die casting machine?
One part of die is stationery and other is moveable
Both part of die are stationery
Both part of die are moveable
None of the above
Cast iron pipes and cylindrical barrels are produced in
true centrifugal casting
semi centrifugal casting
centrifuged casting
die casting
Dental castings and turbine blades are produced by
Centrifugal casting
Investment casting
Die casting
Sand casting
Petrol engine cylinder are made by
Shell moulding
Plaster mould casting
Investment casting
Centrifugal casting
In which of the following process, the metal is rapidly chilled to the point of solidification
Centrifugal casting
Investment casting
Continuous casting
Die casting
Use of runner, risers and cores are eliminated in
Centrifuged casting
Die casting
Permanent mould casting
Semi permanent mould casting
