Hardened steel is softened by___________________?
A. Normalising
B. Tempering
C. Annealing
D. Carburising
Materials and Construction
The ‘bomb’ in the bomb calorimeter is made of___________________?
The ‘bomb’ in the bomb calorimeter is made of___________________?
A. Molybdenum stainless steel
B. Mild steel
C. High silicon iron (14% Si)
D. Copper
_____________________ is used for determining the tensile strength of steels ?
_____________________ is used for determining the tensile strength of steels ?
A. Hydraulic press
B. Universal testing machine
C. Mechanical press
D. None of these
For storing water and acid free benzol, use a ______________ vessel?
For storing water and acid free benzol, use a ______________ vessel?
A. Steel
B. Karbate
C. Stainless steel
D. None of these
Gas holder of a gobar (cow-dung) gas plant is made of___________________?
Gas holder of a gobar (cow-dung) gas plant is made of___________________?
A. Molybdenum stainless steel
B. Tin
C. Mild steel
D. Aluminium
Copper is dissolved from its ore by H2SO4 in a percolation tank made of_________________?
Copper is dissolved from its ore by H2SO4 in a percolation tank made of_________________?
A. Wood
B. Stainless steel
C. Reinforced concrete lined with lead
D. High silicon iron (14% Si)
Addition of ______________ in steel is helpful in increasing the depth of hardness?
Addition of ______________ in steel is helpful in increasing the depth of hardness?
A. Chromium
B. Sulphur
C. Vanadium
D. Tungsten
Addition of nickel to copper improves its_________________?
Addition of nickel to copper improves its_________________?
A. Machinability
B. Ductility
C. Strength
D. Hardness
Clock pendulums are usually made of _______________ steel?
Clock pendulums are usually made of _______________ steel?
A. High speed
B. Stainless
C. Heat resisting
D. None of these
A chemical change takes place when iron_____________?
A chemical change takes place when iron_____________?
A. Rusts
B. Melts
C. Is heated
D. None of these