Related Questions

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
For hardening alloy steels and high speed steels, they are heated to
A 1100 to 1300°C
B 1300 to 1500°C
C 500 to 600°C
D 700 to 900°C
'Killed steels' are those steels
A Which are destroyed by burning
B Which after their destruction are recycled to produce fresh steel
C Which are deoxidized in the ladle with silicon and aluminium
D In which carbon is completely burnt
Steels with high carbon equivalent have poor weldability, because in these steels during welding
A Carbon and other alloying elements get oxidised from the weld pool
B Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld
C Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld
D Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld
Ferric stainless steels compared to austenitic stainless steels
A Have lower corrosion resistance
B Are harder to fabricate
C Are less ductile and hence less suitable for cold pressing
D All of the above
Which of the following is the softest material?
A Quartz
B Calcite
C Corrundum
D Flourite
The softest material just next to talc in the Mho's scale is
A Quartz
B Gypsum
C Feldspar
D Fluorite
The softest rock is
A Marble
B Diamond
C Talc
D Quartz
The softest material in Mho's scale (for measuring hardness) is
A Talc
B Gypsum
C Rubber
D None of these
The softest material just next to talc in the Mhos scale is
A Quartz
B Gypsum
C Feldspar
D Fluorite

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