- (A) Sand & coke is the main raw material for the manufacture of silicon carbide
- (B) Carbon refractories cannot be used in the furnaces operating under reducing conditions
- (C) Mullite can be obtained by the heating of alusite, kyanite or sillimanite
- (D) Silica occurs in nature in all cellular, amorphous or crystalline form
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- (A) Refractories used in muffle furnace should have low thermal conductivity
- (B) The electrical resistivity of refractories drops rapidly with rise in temperature
- (C) For reducing spalling tendency, the refractory should be well fired and its porosity should be more
- (D) Refractoriness under load (RUL) of a refractory is always less than its refractoriness
- (A) Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks
- (B) Graphite refractories are also called plumbago refractories
- (C) Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28
- (D) Calcined magnesite is also called dead burnt magnesite
- (A) Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive forces
- (B) A hydrometer used for the determination of specific gravities of liquids works on the principle of buoyant forces
- (C) In case of unsteady fluid flow, the velocity at any given point does not change with time
- (D) Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure & velocity at a point
- (A) Coke ovens
- (B) Annealing furnace
- (C) Glass tank furnace
- (D) None of these
- (A) Range of fuel firing rates
- (B) Volume of the combustion chamber
- (C) Maximum heat input rate only
- (D) Minimum heat input rate only
- (A) Updraft kiln
- (B) Muffle furnace
- (C) Continuous furnace
- (D) None of these
- (A) Briquettes
- (B) Wood
- (C) Oil gas
- (D) Pitch creosote mixture
- (A) Computing the excess/deficiency of combustion air
- (B) Calculation of flue gas temperature
- (C) Computation of flue gas analysis
- (D) None of these
- (A) Soaking pits
- (B) Walking beam reheating furnace
- (C) Boiler furnace
- (D) Rotary kilns
