Explanation: The essential feature of centrifugal casting is the introduction of liquid metal into a rotating mould. The force responsible for it is the centrifugal force which plays a major role in shaping and feeding of the casting.

Explanation: The true centrifugal castings are straight and have uniform inner diameter is produced by spinning the mold about its own axis. It is rotated either vertically or horizontally as needed to do it.

Explanation: A cylindrical mold is utilized in the true centrifugal casting and is made to rotate on its own axis at such a speed that the metal is poured is thrown to the outer surface of the mould cavity. The metal solidifies to form a hollow cylinder.

Explanation: The De Lavaud process makes use of the metal moulds. The machine contains an accurately machined metal mould (die), entirely surrounded by the cooling water to keep it cool and to increase the production.

Explanation: The De Lavaud machine makes use of the metal moulds. This machine is mounted on wheels and it can be moved lengthwise. This is placed on a slightly inclined track to increase flexibility.

Explanation: Metal moulds prove to be economical when larger quantities of castings are required to be produced. The true centrifugal castings may be produced in metal or sand lined moulds, depending largely upon the quantity desired.

Explanation: Parts not symmetrical about any axis of rotation may be cast in the group of moulds arranged in a circle to balance each other. The axis of mold and that of rotation does not coincide with wach other. The set up is revolved around centre to induce pressure on the metal moulds.

Explanation: In centrifuge castings, the shape of the castings imposes no special limitations in this process and an almost unlimited variety of smaller shapes can be cast using this process.

Explanation: In centrifuge castings, when the castings in multiple layers one above the other are produced in one mould, the method is called stack molding. It is used for producing valves bodies, plugs, yokes etc.

Explanation: Spinning speeds in the semi centrifuge casting need not be as high as those used for true centrifuge castings. A linear speed of the order of 180-200 rpm at the outside edge of the casting is generally recommended.