An engineer’s hammer is made of___________________?
(A) cast iron
(B) forged steel
(C) mild steel
(D) high carbon steel
(D) H.S.S
By severely deforming a metal in a particular direction it becomes _________________?
(A) ductile
(B) malleable
(C) homogeneous
(D) isotropic
(D) anisotropic
Cyaniding is the process of________________?
(A) dipping steel in cyanide bath
(B) reacting steel surface with cyanide salts
(C) adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
(D) obtaining cyanide salts
(D) making corrosion resistant steel
The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as________________?
(A) hysteresis
(B) creep
(C) visco elasticity
(D) Boeschinger effect
(D) inelasticity
The surface hardness of the following order is achieved by nitriding operation__________________?
(A) 600 VPN
(B) 1500 VPN
(C) 1000 to 1100 VPN
(D) 250 VPN
(D) 2000 VPN
Pick up wrong statement about wrought iron ?
(A) It contains carbon of the order of 0 to 0.25%
(B) It melts at 1535°C
(C) It is very soft and ductile
(D) It can be easily forge welded
(D) It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling
A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as_________________?
(A) allotropic change
(B) recrystallisation
(C) heat treatment
(D) precipitation
(D) austempering
Cast iron has_________________?
(A) high tensile strength
(B) its elastic limit close to the ultimate breaking strength
(C) high ductility
(D) all of the above
(D) none of the above
In mottled cast iron, carbon is available in__________________?
(A) free form
(B) combined form
(C) nodular form
(D) flat form
(D) partly in free and partly in combined state
An important property of malleable cast iron in comparison to grey cast iron is the high___________________?
(A) compressive strength
(B) ductility
(C) carbon content
(D) hardness
(D) surface finish