Top 350+ Solved Engineering Materials MCQ Questions Answer
Q. If steel is slowly cooled in furnace, the structure obtained is
a. Pearlite
b. Martensite
c. Sorbite
d. Acicular
e. Troosite
Q. Machinability of a metal depends on
a. Tensile strength
b. Hardness
c. Toughness
d. (A) and (B) above
e. (B) and (C) above
Q. Which is expected to be strongest in tension?
a. Aluminium wire
b. Mild steel wire
c. Piano wire
d. Stainless steel wire
e. Brass wire
Q. When metal is deformed by cold work, severe stresses known as residual stresses are undesirable and to remove them
a. The metal should be stressed in reverse direction
b. The metal should be painted
c. The metal should be reheated below recrystallization temperature
d. The metal should be reheated above recrystallization temperature
e. None of the above
Q. The ability of a tool to resist softening at high temperatures is known as
a. Super hardness
b. Red hardness
c. Extended hardness
d. Double hardness
e. None of the above
Q. Electron with energy level of 2 MeV is considered as
a. Fast electron
b. There is no consideration as such
c. Dead slow electron
d. Slow electron
e. Super-fast electron
Q. Shot peening
a. Changes the crystalline structure of material
b. Refines the grain structure
c. Is done at recrystallization temperature
d. Improves fatigue life of small parts
e. Causes metal surface to be in tension and the layer beneath in compression
Q. when atoms are hold together by the sharing of valence electrons
a. They form a covalent bond
b. The valence electrons are free to move away from the atom
c. Each shared electron leaves a hole
d. Each atom becomes free to move
e. None of the above
Q. When piece of 0.2% carbon steel is heated above third critical point the steel is a solid solution of carbon in gamma iron and called
a. Ferrite
b. Austenite
c. Pearlite
d. Eutectoid
e. Cementite
Q. The common household glass is
a. Lead glass
b. Borosilicate glass
c. Semi-conductors
d. Soda lime glass
e. High silica glass
Q. Silicon doped with phosphorous is an
a. intrinsic semi-conductor
b. extrinsic semi-conductor
c. p-type semi-conductor
d. n-type semi-conductor
e. None of the above
Q. When a normal atom loses an electron, the atom
a. Becomes a positive ion
b. Becomes a negative ion
c. Becomes a electrically neutral
d. Is then free to move about
e. None of the above
Q. Steel pipes are generally manufactured by
a. Forging process
b. Machining process
c. Extrusion process
d. Cold working process
e. Electroforming process
Q. Which of the following class of materials are good conductors of heat and electricity?
a. Polymers
b. Dielectries
c. Ceramics
d. Semi-conductors
e. Metals