Presence of cobalt in steel improves its____________________?
A. Cutting ability
B. Corrosion resistance
C. Tensile strength
D. None of these
Materials and Construction
A hardness depth of about 3 mm can be achieved by induction hardness in ______________ seconds?
A hardness depth of about 3 mm can be achieved by induction hardness in ______________ seconds?
A. 5
B. 100
C. 250
D. 500
Wrought iron is having very high ________________?
Wrought iron is having very high ________________?
A. Hardness
B. Strength
C. Corrosion resistance
D. Susceptibility to changes in its properties by heat treatment
Rotary kilns in cement industry are lined with _____________bricks?
Rotary kilns in cement industry are lined with _____________bricks?
A. Fireclay
B. Silica
C. Lead
D. High alumina & high magnesia
Post weld heat treatment is done by____________________?
Post weld heat treatment is done by____________________?
A. Normalising
B. Stress relieving
C. Tempering
D. Solution annealing
High speed steel tools retain their hardness upto a temperature of _____________ °C?
High speed steel tools retain their hardness upto a temperature of _____________ °C?
A. 500
B. 750
C. 900
D. 1100
When iron is rusted, it is__________________?
When iron is rusted, it is__________________?
A. Converted to a fine powder
B. Reduced
C. Oxidised
D. None of these
Caustic soda is transported in _____________ lined containers ?
Caustic soda is transported in _____________ lined containers ?
A. Glass
B. Nickel
C. Neoprene
D. Either B. or C.
_______________ is a donor impurity for semi-conductors ?
_______________ is a donor impurity for semi-conductors ?
A. Boron
B. Antimony
C. Gallium
D. None of these
Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the ______________ stress?
Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the ______________ stress?
A. Ultimate
B. Yield point
C. Proof
D. None of these