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Furnaces



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Q1. Why are flux added to the charge ( parent metal to be melted) during melting of a metal?

(a) To increase carbon content
(b) To increase refractoriness
(c) To add specific oxides
(d) To remove specific oxides

Q2. What is hearth in a furnace?

(a) The electrodes are often called hearth
(b) The walls of the furnace
(c) The bowl shaped bottom of the furnace
(d) The dome shaped roof of the furnace

Q3. There is no direct contact of flame and metal in which of the following type of furnace?

(a) Cupola
(b) Crucible
(c) Electric arc
(d) Induction

Q4. Electric arc furnaces are most suitable for which of the following type of material?

(a) Ferrous
(b) Non-Ferrous
(c) Both ferrous and nonferrous
(d) Neither ferrous nor nonferrous

Q5. Which of the following metal has a melting point of about 1537oC and latent heat of fusion 65.0 cal/g?

(a) Nickel
(b) Copper
(c) Zinc
(d) Iron

Q6. Which of the following chemical compound, is the most common flux added to the charge in a cupola furnace?

(a) Coke
(b) Methane
(c) Carbon dioxide
(d) Limestone

Q7. Incoming air pressure and quantity in cupola furnace are controlled by which of the following element?

(a) Tuyeres
(b) Tapping spout
(c) Wind box
(d) Blast pipe

Q8. What is the function of slag hole in a cupola furnace?

(a) To tap the slag generated
(b) To generate the slag
(c) To allow outflow of gases
(d) All of the mentioned

Q9. Why is sand bed prepared for melting of metal in Cupola furnace?

(a) It provides a refractory bottom
(b) It soaks the moisture from the metal
(c) It conducts the heat faster and uniformly
(d) None of the mentioned

Q10. For melting of cast iron, which of the following furnace is used?

(a) Rotary furnace
(b) Cupola furnace
(c) Pit furnace
(d) Electric furnace


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