GATE ME Engineering Materials : National Champion Test for ESE & GATE ME Exams

Question 1

Statement (I):Cobalt exhibits hexagonal close-packed structure below 420 °C.
Statement (II): Structure of cobalt changes to face-centred cubic structure above 420 °C.

Question 2

Assertion (A):Solid solutions of metal are crystals whose properties are close to those of the solvent.
Reason (R): They retain the same crystal lattice and type of bond.

Question 3

Spheroidal or nodular graphite iron is designated as SG 500/7. Here ‘500’ and ‘7’ stand for

Question 4

Very small quantity of carbon in iron as in steels forms interstitial solid solution mainly because atomic size(s) of

Question 5

Which one of the following cast irons consists of carbon in rosette form __________?

Question 6

Addition of which one of the following elements, shifts the lower critical temperature line in iron-iron carbide diagram towards the higher side?

Question 7

In Eutectoid reaction a solid phase transforms into two other solid phases upon cooling. Which one of the following is correct in the case of Eutectoid reaction occurring in Iron-Carbon phase diagram?

Question 8

Consider the following statements regarding the behavior of dislocation:
[1]. Only edge dislocation and mixed dislocation can have glide motion.
[2]. A screw dislocation cannot have glide motion.
[3]. Dislocation moves in the direction perpendicular to that of shear stress.
[4]. Motion of dislocation occurs on slip plane that contains Burger’s vector and direction vector.
Which of the above statements are correct?

Question 9

A constitutional diagram shows relationship among which of the following combinations in a particular alloy system?

Question 10

What is a surface imperfection, which separates crystals of different orientations a poly-crystalline aggregate, called?

Question 11

Elements A and B form eutectic type binary phase diagram and the eutectic composition is 60 wt% [B]. If just below eutectic temperature, the eutectic phase contains equal amounts (by wt) of two solid phases, then the compositions of the two solid phases are

Question 12

Which one of the following statements is correct in the case of screw dislocations?
(

= Burger’s Vector;

= Imaginary Vector)

Question 13

Which one of the following is correct for ‘Climb’ ________?

Question 14

In a triclinic unit cell

Question 15

Vibration damping in machinery is best achieved by means of base structures made of which one of the following material?

Question 16

Solid material chemical bonds are

Question 17

What is the diameter of the largest sphere in terms of lattice parameter a, which will fit the void at the centre of the cube edge of a BCC crystal?

Question 18

Consider the following:
[1]. Crystal structure
[2]. Relative size
[3]. Chemical affinity
[4]. Valency
Which of these factors govern relative solubility of two metals in each other in the solid state?

Question 19

Copper has FCC structure, its atomic radius is 1.28 Å and atomic mass is 63.5. The density of copper will be

Question 20

What is the interplanar spacing having miller indices as [2 0 0], [2 2 0], [1 1 1] respectively in an FCC crystal of atomic radius 1.246 Å?

Question 21

What is the planar density of (100) plane in FCC (face-centred cubic) crystal with unit cell side a equal to?

Question 22

What is the approximate strain energy expression for a dislocation of unit length, irrespective of its edge or screw character?

where, G = shear modulus of elasticity & b = burger vector magnitude

Question 23

Which of the following materials is used in the manufacture of extrusion nozzles?

Question 24

The elements which, added to steel, help in chip formation during machining are

Question 25

In the designation of Aluminium casting A5 14.0 14 indicates