Materials Engineering deals in the study of material at atomic and molecular level. It is an amalgamation of engineering physics and chemistry, covering design, discovery and advancement of different materials . It includes understanding of building structure of materials at various subatomic levels including the influence in its properties with several external factors.
Question 1: The structure formed by the distribution and arrangement of crystal within material
a) Electronic structure b) Microstructure
c) Macrostructure d) Crystal structure
Answer: d) Crystal structure
Explanation: Crystal structures are basically the ordered arrangement of atoms and molecules within
Question 2: Which of the following materials is made from two or more materials.
a) Metal and non-metal b) Ceramic and organic
c) Composite and alloy d) Ions and compound
Answer: c) Composite and alloy
Explanation: Composite material is made up by combining two or more fibres with the help of binders, to obtain desired material properties.
Question 3: How many bravais lattices are there in three dimensional space ?
(a) 10 (b) 12
(c) 13 (d) 14
Answer: d) 14
Explanation: In the three dimensional space there are 14 distinct
Question 4: The type of defect when a pair of cation and anion are missing from the ionic crystal is
a) Schottky defect b) Frenkel defect
c) Vacancy defect d) Interstitial defect
Answer: a) Schottky defect
Explanation: Schottky defects are point defects caused by a vacant position that
Question 5: Which of the following are not hardness test.
a) Rockwell test b) Brinell test
c) Izod test d) Mho test
Answer: c) Izod test
Explanation: All the tests are hardness test except izod
Question 6: Which of the following micro constituents of steel is the combination of ferrite and cementite?
a) Pearlite b) Austentite
c) Bainite d) Sorbite
Answer: a) Pearlite
Explanation: Pearlite is a combination of about 87% of ferrite and 13%
Question 7: In an Iron-carbide equilibrium diagram, Iron carbon alloys containing __ % carbon are called steels.
a) 1.2% b) 2.5%
c) 2.1% d) 2.3%
Answer: c) 2.1%
Explanation: In an Iron-carbide equilibrium diagram, Iron carbon alloys containing 2.1% carbon are called steels and those containing over 2.1% carbon are called cast irons.
Question 8: Which of the following heat treatment processes involves heating steel to a temperature above critical point, holding, and then rapidly cooling in water or oil bath.?
a) Annealing b) Tempering
c) Normalising d) Quenching
Answer: d) Quenching
Explanation: In quenching (hardening), a metal is heated to temperature greater than normal condition
Question 9: Hardness in surface hardening followed by sequence
a) Nitriding > Cyaniding > Carburizing b) Nitriding < Cyaniding < Carburizing
c) Nitriding > Cyaniding = Carburizing d) Nitriding = Cyaniding > Carburizing
Answer: a) Nitriding > Cyaniding > Carburizing
Explanation: Normally, Carburising is followed by hardening and low temperature tempering.
Question 10: Which of the following alloying elements increases the strength and toughness of cast iron?
a) Vanadium b) Nickel
c) Copper d) Molybdenum
Answer: d) Molybdenum
Explanation: 0.25% - 1.25% of Molybdenum