Which of the following materials can be used for making patterns?
Lead is not used for making patterns.
Match the List-I (Equipment) with List-II (Functions):
A. Hot chamber machine
C. Dielectric baker
D. Sand blasting
2. Core making
3. Die casting
A B C D
(a) 3 5 2 1
(b) 4 2 5 3
(c) 4 2 3 1
(d) 3 5 1 2
Which of the following materials requires highest shrinkage allowance?
Chills are used in casting moulds to
Directional solidification can be achieved by providing
Chaplets are used in mould for
Chaplets are used to support the core inside the mould cavity, take care of its own weight and overcome the metallostatic forces.
The casting defect which is not caused by the high pouring temperature of melt is
Metal penetration is not caused due to high pouring temperature. It caused due to improper ramming of sand.
Fluidity is greatly influenced by
Fluidity can be defined as the length of spiral covered by the molten metal before it get solidifies.
Fluidity is the function of temperature, higher the temperature, more will be the fluidity.
Which of the following materials has more shrinkage allowances
The two parts of a sand casting mould are called
Cope and drag are two parts of the casting mould.
Upper part is called cope and lower part is called drag.
While pouring molten metal in the mould of the molten metal does not appear in the riser. It indicates
In solidification of metal during casting, compensation for solid contraction is
Liquid shrinkage and shrinkage during phase change is provided by riser and solid shrinkage can be compensated by providing allowances over the pattern.
Which of the following casting mould uses metal moulds?
In die casting some permanent mould is used which may be made of metal.
What is the purpose of inoculation
Cores are used in the casting to
Misrun is a casting defect which occur due to
Misrun is a casting defect caused due to insufficient fluidity of molten metal.
Scab is a
Scab is sand casting defect caused due to improper ramming of moulding sand.
An improper riser may give rise to a defect called
An improper riser may give rise to a defect called shrinkage cavity
The casting defect caused by the erosion of sand
The purpose of gate is to
Gate is the opening through which the molten metal enters the mould cavity. The shape and the cross section of the ingot should be such that it can readily be broken off after casting solidification and also allow the molten metal to enter quietly into the mould cavity.
The purpose of riser is to
A riser, also known as a feeder, is a reservoir built into a metal casting mold to prevent cavities due to shrinkage.
Most metals are less dense as a liquid than as a solid so castings shrink upon cooling, which can leave a void at the last point to solidify.
The casting method adopted for ornament toys of nonferrous alloys is
Slush casting is used to produce ornament, small toys etc.
Sprue in casting refers to
hence sprue is a vertical passage in the parting plane through which molten metal from the pouring basin reaches the mould cavity.
Bottom gating system is sometimes preferred in casting because
Which one of the following processes produces a casting when pressure forces the molten metal into the mould cavity.
Die casting are of two types:
1. Pressure die casting
2. Gravity die casting
In pressure die casting the molten metal is pressurized to enter into the mould while in case of gravity die casting molten metal fined into the mould by means of gravitational force.
In a green sand moulding process, uniform ramming leads to
In the green sand moulding process due to improper raming of moulding sand defects like sand expansion, metal penetration, run out etc. are generated.
Which of the following are the most likely characteristics in centrifugal casting?
Casting acquired high density and are distinguished for their fine grained structure and high mechanical strength
The centrifugal casting method is used for casting articles of
In centrifugal casting mould in rotated about horizontal axis.
The impurities in true centrifugal casting
Since impurities are lighter than the metal hence they get collected at the inner surface of the casting.
Consider the following ingredients used in moulding
1. Dry silica sand
3. Phenol formaldehyde
4. Sodium silicate
Q. These used for shell moulding include