- (A) The minimum value of baffle spacing is 50 mm
- (B) The maximum value of baffle spacing is equal to the I.D. of the shell
- (C) The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these
- (D) Disk and doughnut baffle is the most commonly used baffle
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- (A) Blast furnace
- (B) Hot blast stove
- (C) Cupola
- (D) Wall of coke oven
- (A) Quartz
- (B) Cristobalite
- (C) Tridymite
- (D) All have the same specific gravity
- (A) Increases with decrease in porosity
- (B) Decreases with decreases in porosity
- (C) Is independent of its porosity and is maximum for insulating bricks
- (D) Increases with the amount of air entrapped in pores
- (A) Electric furnace walls
- (B) Steel melting furnace
- (C) Open hearth furnace
- (D) Burning zone of cement kilns
- (A) Silica
- (B) Fireclay
- (C) High alumina refractory
- (D) Carbon black
- (A) Graphite
- (B) Magnesite chrome
- (C) Silica
- (D) Magnesia
- (A) Magnesite
- (B) Dolomite
- (C) Fireclay
- (D) Chrome magnesite
- (A) 700
- (B) 1000
- (C) 1600
- (D) 2000
- (A) Cupola
- (B) Gas producer
- (C) Bottom of hot metal mixer
- (D) Roof of open hearth furnace
