Tensile strength of steel can be safely in-creased by________________?
(A) adding carbon up to 2.8%
(B) adding carbon up to 6.3%
(C) adding carbon up to 0.83%
(D) adding small quantities of copper
(D) adding copper and carbon
Connecting rod is usually made of_________________?
(A) aluminium
(B) low carbon steel
(C) medium carbon steel
(D) high carbon steel
(D) cast iron
Tungsten in high speed steel provides________________?
(A) hot hardness
(B) toughness
(C) wear resistance
(D) sharp cutting edge
(D) cold hardness
Sulphur in steel________________?
(A) acts as deoxidiser
(B) reduces the grain size
(C) decreases tensile strength and hardness
(D) lowers the toughness and transverse ductility
(D) increases hardness
The ultimate tensile strength of low carbon steel by working at a high strain rate will_________________?
(A) decrease
(B) increase
(C) remain constant
(D) first increase and then decrease
(D) first decrease and then increase
The tensile strength of wrought iron is maximum _________________?
(A) along the lines of slag distribution
(B) perpendicular to lines of slag distribution
(C) uniform in all directions
(D) unpredictable
(D) none of the above
Preheating is essential in welding ___________________?
(A) cast iron
(B) high speed steel
(C) all non-ferrous materials
(D) all of the above
(D) none of the above
Balls for ball bearings are made of_________________?
(A) cast iron
(B) mild steel
(C) stainless steel
(D) carbon-chrome steel
(D) high carbon steel
Which is the false statement about wrought iron. It has________________?
(A) high resistance to rusting and corrosion
(B) high ductility
(C) ability of hold protective coating
(D) easily weldable characteristics
(D) uniform strength in all directions
Taps, dies and drills contain carbon________________?
(A) below 0.5%
(B) below 1%
(C) above 1%
(D) above 2.2%
(D) nil