Match the items in Column I and Column II.
Column I Column II
P. Charpy test 1. Fluidity
Q. Knoop test 2. Micro hardness
R. Spiral test 3. Formability
S. Cupping test 4. Toughness
Decreasing grain size in a polycrystalline material
A carbon steel having Brinell Hardness number 100 should ultimate tensilestrength closer it
Which one of the following factors is more relevant to represent completesolubility of two metals in each other?
Herbert cloudburst Hardness test is conducted to know
In this metal surface is subjected to rain of several hundred thousand 3 mm diameter hard steel balls talling from a known height. The impact of each ball produces an imprint varying inversely in size with the hardness of the material at the point of impact. The imprint-size pattern shows whether or not there is uniformity of hardness over the entire test are.
Which of the following statement is true about brittle fracture?
A measure of Rockwell hardness is the
The material property which depends only on the basic crystal structure is
Ans. (c) The material property which depends only on the basic crystal structure is fracture strength. Elastic constant depends not only on material parameters but also on the experimental geometry.
Which one of the following pairs of axis lengths (a, b, c) and inter-axial angles (α,β, γ) represents the tetragonal crystal system?
Match List-I (Crystal Structure) with List-II (Example) and select the correct answer using the codes given below the Lists:
(Crystal Structure) (Example)
A. Simple Cubic 1. Zinc
B. Body-centered Cubic 2. Copper
C. Face-centered Cubic 3. Alpha iron at room temperature
D. Hexagonal Close Packed 4. Manganese
Codes: A B C D A B C D
(a) 4 3 1 2 (b) 4 3 2 1
(c) 3 4 2 1 (d) 3 4 1 2
No of lattice point = 1 + (1/4) x 1 = 2; area a2 planner densiy = 2 / a2
What is the planar density of (100) plane in FCC (face-centred cubic) crystal with unit cell side a equal to?
Ans. (b) Plane (100) intercepts (1,α,α )
In Zinc Blende structure, each atom is surrounded by four atoms of the oppositekind which are located at the comers of which one of the following?
A metal has FCC structure. Suppose its atomic weight and atomic radius is A and r respectively. Let N denotes Avogadro's number. What is the density of the material?
latice conotant (a) =
For F.C.C. n = 4,
Consider the following temperature ranges:
1. Room temperature
2. 0 to 910°C
3. 910°C to 1400oC
4. 1400oC to below melting pointIn which of the above temperature ranges ferrite with body centered cubic structure isindicated in, the Fe-Fe3C phase diagram?
The effective number of lattice points in the unit cell of simple cubic, bodycentered cubic, and face cantered cubic space lattices, respectively, are
The micro structure composition of pearlite for a Fe3C diagram consists of
Atomic packing factor (APF) in the case of copper crystal is
Which one of the following is the correct ascending order of packing density forthe given crystal structures of metals?
Assertion (A): Plastic deformation in metals and alloys is a permanentdeformation under load. This property is useful in obtaining products by coldrolling.
Reason (R): Plastic or permanent deformation in metal or alloy is caused bymovement or dislocations.
Ans. (c) The deformation of metals, which is caused by the displacement of the atom is
achieved by one or both of the processes called slip and twinning.
The B.C.C. and H.C.P. metals undergo plastic deformation by: