Friday, February 22, 2019

Refractory Technology (Objective Questions With Answers)

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01. Silica refractories are not used in
(A) Coke oven walls
(B) Beehive coke ovens
(C) Dome and upper portion of B.F. stoves
(D) Open hearth furnace roof
Answer: Option B

02. Si percentage in silica refractories used in the walls of coke oven is about
(A) 45
(B) 60
(C) 80
(D) 95
Answer: Option D

03. Porosity of silica bricks varies from __________ percent.
(A) 5 to 10
(B) 20 to 30
(C) 45 to 60
(D) 60 to 75
Answer: Option B

04. Chrome magnesite bricks are
(A) Acidic in nature
(B) Neutral in nature
(C) Having higher RUL than silica bricks
(D) Made by mixing 30% Chromite and 70% Periclase
Answer: Option C

05. Alumina-graphite bricks are used for lining the
(A) Slide gate in teeming laddies
(B) Continuous casting systems
(C) Both (A) and (B)
(D) Neither (A) nor (B)
Answer: Option C

06. Maximum shrinkage in volume occurring during burning/firing of dried refractories may be
as high as __________ percent.
(A) 10
(B) 15
(C) 20
(D) 30
Answer: Option D

07. The main raw material for manufacture of silicon carbide refractories is
(A) Corundum
(B) Carborundum
(C) Bauxite
(D) Periclase
Answer: Option B

08. Which of the following consumes the maximum tonnage of refractories annually in an
integrated steel plant?
(A) Soaking pits
(B) Reheating furnace
(C) L.D. converter
(D) Rotary lime kiln
Answer: Option C

09. Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the
(A) Washing action of metal
(B) Corrosion by layer of slag
(C) Both (A) & (B)
(D) Neither (A) nor (B)
Answer: Option A

10. Lower part of hot metal mixer are lined with __________ bricks.
(A) Superduty fireclay
(B) High alumina
(C) Silica
(D) Carborundum
Answer: Option D

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