Chemical Engineering Mcqs

Hot blast main (carrying air at 1000°C) in blast furnace are lined with ______________ bricks?

• (A)  Silica
• (B)  Fireclay
• (C)  Magnesite
• (D)  Zirconia

Answer

Submitted By :Ali Uppal

The maximum linear expansion of silica bricks during firing is about ______________ percent?

• (A)  0.5
• (B)  1
• (C)  2
• (D)  3.5

Answer

Submitted By :Ali Uppal

Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for _____________ bricks?

• (A)  Fireclay
• (B)  Silica
• (C)  Dolomite
• (D)  Very low alumina

Answer

Submitted By :Ali Uppal

Dilatometer is used for the determination of ______________ of refractories?

• (A)  Modulus of rupture
• (B)  Permanent linear change
• (C)  Resistance to CO attack
• (D)  RUL

Answer

Submitted By :Ali Uppal

Highest melting (m.p = 3070°C) oxide refractory is__________________?

• (A)  Alumina
• (B)  Thoria
• (C)  Zirconia
• (D)  Magnesia

Answer

Submitted By :Ali Uppal

Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with _____________ bricks?

• (A)  Bakelite impregnated or fused periclase
• (B)  Silica
• (C)  Semi-silica
• (D)  Fireclay

Answer

Submitted By :Ali Uppal

Bottom of basic open hearth furnace are constructed of__________________?

• (A)  Dead burnt magnesite ramming mass
• (B)  Porous fireclay bricks
• (C)  Semi-silica bricks
• (D)  Silicon carbide bricks

Answer

Submitted By :Ali Uppal

Fusion temperature of pure silica (SiO2) is _______________ °C?

• (A)  1350
• (B)  1715
• (C)  2570
• (D)  2800

Answer

Submitted By :Ali Uppal

Porosity of fireclay refractories is _______________ percent?

• (A)  5-10
• (B)  10-25
• (C)  25-35
• (D)  35-50

Answer

Submitted By :Ali Uppal

High alumina refractory compared to fireclay bricks have____________________?

• (A)  Less load bearing capacity
• (B)  Less resistance to slag attack
• (C)  Low refractoriness
• (D)  High resistance to thermal shock and creep

Answer

Submitted By :Ali Uppal