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The case hardening technique suitable for steels with very low carbon content
A) Cyaniding B) Induction hardening
C) Electron beam hardening D) Flame hardening

. Martensite is a

A) Stable phase with body centred tetragonal unit cell

B) Meta stable phase with body centred tetragonal unit cell
C) Meta stable phase with body centred cubic unit cell

D) Stable phase with body centred cubic unit cell

Name the type of cast iron in which carbon is present in the form of free graphite
flakes.

A) White cast iron B) Malleable cast iron
C) Grey cast iron D) Chilled cast iron

Due to its biocompatibility and properties very close to human bone, which of these
alloys are extensively used as bone implants ?

A) Copper alloys B) Aluminium alloys

C) Micro alloy steels D) Titanium alloys

Jominy end quench test is used to determine the
A) Hardness of a material B) Ductility of a material
C) Hardenability of a material D) Brittleness of a material

Which of the following statements are true for Mohr's circle in a plane stress condition ?
i. Maximum shear is at the top and bottom of the circle

ii. The maximum shear stress is equal to the radius of the circle

iii. The principal stresses are located at the horizontal axis where shear is zero

iv. The maximum shear stress is equal to twice the radius of the circle

A) iand iv B) i, ii and iii

C) iii and iv D) All the above

A metallic cube of side 5 cm is triaxially loaded with 50 KN and 75 kN tensile loads
and 100 kN compressive load in the x, y and z directions, respectively. If the Poisson’s
ratio is 0.25 and the Young’s modulus is E N/mm?, the volumetric strain will be

4) - 3305 8) 300/೯

0) 410/೯ 7) 330/೯