Related Questions

An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?
A Cork
B Saw dust
C Sand
D Chemically prepared foam
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
A CO2
B N2
C O2
D CO
Thermal conductivity of refractory bricks
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 red house is built from red bricks . A blue house is built from blue bricks. A white house is built from white bricks. Then what is a greenhouse made from ?
A green bricks
B wood
C glass
D steel
The solid brick shown is made of small square shaped bricks of side 1. when the large brick is disassembled into its component small bricks. the total surface area of all the small bricks is how much greater than the surface area of the large brick?
A 32
B 40
C 60
D 72
High thermal conductivity of a refractory material is not important, when it is to be used in the
A Coke oven regenarators
B Muffle furnace
C Blast furnace
D Recuperators
If a refractory contains high content of silicon, it means refractory is
A Acidic
B Basic
C Neutral
D Brittle
For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally
A Decreases
B Increases
C Remains unchanged
D Increases exponentially
Refractory bricks having lower porosity have
A High insulating properties
B Low heat capacity
C Low thermal conductivity
D Greater strength
Refractory bricks burnt at very high temperature have got
A Greater resistance to corrosion by slags
B Less resistance to corrosion by slags
C High spalling tendency
D None of these

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