# Casting Questions and Answers – Rotory Melting Furnace

This set of Metal Casting Multiple Choice Questions & Answers (MCQs) focuses on “Rotory Melting Furnace”.

1. Where was the rotary melting furnace originated?
a) Germany
b) Italy
c) U.S.A
d) England

Explanation: The concept of the rotary melting furnace was first developed in Germany, and later because of its success, was adopted by the U.S.A and other countries of Europe.

2. What is the shape of a rotary melting furnace?
a) Spherical
b) Cylindrical
c) Cuboidal
d) Hemi-spherical

Explanation: The rotary melting furnace is a cylindrical shell made up of steel shell. The rotary melting furnace is used for rotating or rocking purposes.

3. What is the speed of rotation of a rotary melting furnace?
a) 0.5 rpm
b) 1 rpm
c) 2 rpm
d) 3 rpm

Explanation: The rotary melting furnace is used for rotating and rocking purposes. This furnace makes a complete rotation about itself every minute, hence the speed of rotation of a rotary melting furnace is 1 rpm.

4. After how many heats, should the refractory lining be renewed?
a) 50-100
b) 100-200
c) 200-300
d) 300-400

Explanation: The refractory lining must be renewed, as the constant heating processes may cause it to damage. After approximately, 200 to 300 heats, the refractory lining should be renewed for a smooth operation.

5. In the given figure of a rotary melting furnace, what does the question mark depict?

a) Burner
b) Exhaust box
c) Refractory lining
d) Molten metal

Explanation: In this given figure of a rotary melting furnace, the question mark is depicting the refractory lining, which is just below the steel shell. This lining has to be renewed after a certain usage.

6. In the given figure of a rotary melting furnace, what does the question mark depict?

a) Steel shell
b) Exhaust box
c) Refractory lining
d) Molten metal

Explanation: The question mark is depicting the steel shell, which is the outer body of the furnace. The shape of this furnace is typically cylindrical.

7. In the given figure of a rotary melting furnace, what does the question mark depict?

a) Steel shell
b) Exhaust box
c) Refractory lining
d) Molten metal

Explanation: None.

8. In the given figure of a rotary melting furnace, what does the question mark depict?

a) Steel shell
b) Exhaust box
c) Refractory lining
d) Molten metal

Explanation: In this given figure of a rotary melting furnace, the question mark is depicting the molten metal, which is then being heated and further treated for the production of malleable cast iron.

9. In the given figure of a rotary melting furnace, what does the question mark depict?

a) Exhaust box
b) Burner
c) Refractory lining
d) Molten metal

Explanation: Here the question mark is depicting the burner. This burner is situated at the opening of the furnace at its mouth. The burner simply burns the fuel and air mixture for heating operations.

10. The rotary furnace can have a capacity of 80 tons.
a) True
b) False

Explanation: A typical rotary melting furnace cannot have a capacity of 80 tons, the reason being, its minimum capacity to be 1 ton, and maximum capacity to be up to only 50 tons.

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