Question

______________ is the only feeder force in the open riser.

(a) Centrifugal force

(b) Gravitation force

(c) Centripetal force

(d) Compression force

The question was asked by my college director while I was bunking the class.

The origin of the question is Types of Risers in division Concept of Gating and Risering of Foundry and Forging

Answer 1

Correct choice is (b) Gravitation force

The explanation is: The liquid metal in the open riser is fed to the solidifying casting under the force of gravity and the atmospheric pressure till the top surface of the riser solidifies and thereafter it is observed that the gravity is only feeder force.