A. 450
B. 250
C. 150
D. 65
Related Mcqs:
- Cold crushing strength of fireclay bricks is about ______________ kgf/cm2?
A. 50-100
B. 100-150
C. 200-400
D. 500-1000 - Cold crushing strength of a refractory does not depend upon its ____________________?
A. Shape
B. Composition
C. Firing temperature
D. Texture - Cold crushing strength of refractories depends upon its_________________?
A. Composition
B. Texture
C. Firing temperature
D. All A., B. and C. - . Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2) is ______________ °C?
A. 500
B. 1000
C. >1350
D. >2000 - Addition of grog in fireclay brick during its manufacture is advantageous, because it results in_____________________?
A. Less shrinkage in heating, decreased apparent porosity & increased specific gravity
B. High strength & thermal spalling resistance
C. Less addition of water to get a workable plasticity & lesser time required for drying the raw
refractories and hence increased rate of production
D. All A., B. and C. - Grog addition in fireclay during brick manufacture is done to_________________?
A. Reduce its shrinkage on heating
B. Impart greater spalling resistance
C. Enhance the strength of fired refractories
D. All A., B. and C. - Crushing strength of a refractory____________________?
A. Increases with rise in service temperature
B. Decreases with rise in service temperature
C. Is unaffected with change in service temperature
D. Decreases with increase in porosity - Maximum safe working temperature for fireclay bricks is about __________ °C?
A. 1150
B. 1300
C. 1450
D. 1550 - Refractoriness of a typical silica brick corresponds to Segar cone number, ’32’, which is equivalent to a temperature of _____________ °C?
A. 1380
B. 1520
C. 1710
D. 1915 - 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
