Material Engineering Test

Material Engineering Test

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As per Chvorinov's rule, calculate the total freezing time of a casting whose volume is 8 cubic meters and surface area 4 square meters. The Boltzmann's constant is 10?

a. 20 minutes

b. 30 minutes

c. 40 minutes

d. 50 minutes

Premature failure of a material under the action of repeated stresses is known as _____________.

a. fatigue

b. creep

c. fracture

d. notch sensitivity

Which among the following types of nuclear fuels is used as structural components in water cooled systems as well as for cladding fuel elements?

a. Uranium

b. Thorium

c. Zirconium

d. Plutonium

On the basis of which of the following factors do metals tend to form an intermediate phase rather than a solid solution?

a. Crystal structure factor

b. Relative size factor

c. Chemical affinity factor

d. Relative valence factor

Which of the following increases the tendency towards brittle fracture in materials?

a. increasing temperature

b. decreasing strain rate

c. decreasing temperature

d. increasing strain rate

By which of the following equations can the number of defects at equilibrium be determined?

where

n_d = number of defects
Ne = number of atomic sites per cubic mole
Ed = energy of activation necessary to produce a defect
k = Boltzman's constant
T = Absolute temperature

a. n_d=Ne^-Ed/kT

b. n_d=Ne^-Ed*kT

c. n_d=Ne^kT/-Ed

d. n_d=Ne^kT*-Ed

Calculate the value of D₂₀₀ in a metal. The metal has a face centered cubic structure and an atomic radius equal to 5 Å.

a. 2.5 Å

b. 1.5 Å

c. 3.5 Å

d. 4.5 Å

Which of the following lines of the phase in a phase diagram does liquid line represent?

a. Where solidification starts

b. Where solidification completes

c. Below which the alloy is in a solid state

_____________ of a material represents the condition in which the deformation of a material is elastic.

a. The yield strength

b. The tensile strength

c. The impact strength

d. The compression strength

Which of the following types of iron is used to make piston rings?

a. Gray cast iron

b. Malleable cast iron

c. Noducal cast iron

d. White cast iron

Which among the following solid solution alloys are considered typical solid solution alloys?

a. Ni-Cu alloys

b. Cu-Zn alloys

c. Au-Ag alloys

A metal above the freezing point is in a:

a. liquid state

b. solid state

c. gaseous state

d. supercooled state

Which among the following materials is used for making coins and medals?

a. Gilding metal

b. Aluminium brass

c. Admiralty brass

d. Muntz metal

The concentration of impurities arising during freezing is known as:

a. segregation

b. homogenization

c. sublimation

d. solidification

Calculate the D₂₂₀ spaces of a face centered cubic structure having an atomic radius equal to 2Å.

a. 2 Å

b. 3 Å

c. 4 Å

d. 5 Å

Which among the following is a microstructure of ferrite and cementite produced on tempering martensite at a temperature above 400ºC?

a. Trostite

b. Sorbite

c. Bainite

d. Pearlite

Which of the following thermal properties of materials is related to the rate at which heat can flow through a material at a given temperature?

a. Specific heat

b. Thermal expansion

c. Thermal conductivity

d. Thermal shock resistance

How many grain boundaries are there in a single crystal material?

a. 0

b. 1

c. 2

d. 3

e. 4

_____________ is the capacity of a material to absorb energy when it is deformed.

a. Resilience

b. Toughness

c. Plasticity

d. Elasticity

Critical cooling rate is the slowest rate of cooling at which _____________.

a. martensite is converted into austenite

b. austenite is converted into martensite

c. cementite is converted into austenite

d. cementite is converted into martensite

Calculate the thickness of the deposition of a solid metal on the basis of the given parameters:

Aj = 10 mm / hour (where Aj is a constant which depends upon the poured metal and the mold material)

T = 25 hours (time required for the metal to solidify)

a. 40mm

b. 50mm

c. 60mm

d. 70mm

While checking the microstructure of iron under a microscope, which form of iron exhibits a ferrite grain boundary?

a. Grey cast iron

b. Graphite cast iron

c. White cast iron

d. Pearlitic grey cast iron

_____________ is the ability of a material to take a different shape as a result of hammering or rolling.

a. Ductility

b. Malleability

c. Brittleness

Which among the following tests is used for impact testing?

a. Izod test

b. Brinnel test

c. Rockwell test

d. Charpy test

What is the importance of Burger's vector in line defect?

a. It marks the magnitude of the strain component of dislocation.

b. It marks the direction of the strain component of dislocation.

c. It marks the magnitude and direction of the strain component of dislocation

d. It marks the velocity of the strain component of dislocation.

e. It marks the velocity and direction of the strain component of dislocation.

Which type of diffusion occurs due to the atomic migration along the surface of a phase?

a. Self-diffusion

b. Inter-diffusion

c. Volume diffusion

d. Surface diffusion

In the austenite phase which form of heat treatment processes is used to deform metastable steel?

a. Ausforming

b. Maraging

c. Austempering

d. Martempering

e. Interrupted quenching

Which of the following materials has the highest bond energy (Kilojoules per mole)?

a. Iron

b. Sodium chloride

c. Silicon dioxide

d. Nitrogen

Which among the following determines the vacancy mechanism of diffusion?

a. Kirkindell effect

b. Fick's effect, first law

c. Fick's effect, second law

d. Horst stormer effect

e. Jahn teller effect

Which type of defect is formed when an atom is removed from a normal lattice site?

a. Schottky defect

b. Vacancy defect

c. Interstitial defect

d. Frankel defect

Which technique is used to make the grain boundaries of a material visible for micro or macro examination?

a. Etching

b. Polishing

c. Grinding

d. Cutting

A boundary at which atomic planes meet at a low angle and then form a structure with boundaries having higher angles is known as _____________.

a. Recovering

b. Polyganizing

c. Crystallizing

d. Re-crystallizing

Which among the following is not a property of molecular crystals?

a. They can be both crystalline and non-crystalline by nature.

b. Good insulators

c. Soluble in non-polar solvents only

d. High melting point

The absorptivity for any material having any wavelength is equal to its _____________.

a. Emissivity

b. Reflectivity

c. Refractive Index

Which among the following is not a function of plastic deformation in materials?

a. Applied stress

b. Temperature

c. Strain rate

d. Load removal

e. Material distortion

The electrical property of a material due to which it offers resistance to high voltages is known as _____________.

a. resistivity

b. conductivity

c. dielectric strength

d. thermo-electricity

Which among the following is not a destructive testing method for materials?

a. Tensile test

b. Impact test

c. Bend test

d. Ultrasonic inspection test

e. Torsion test

Which among the following type of steels is used to make milk cans for dairy industry?

a. Maraging steels

b. Martensitic stainless steels

c. Ferritic stainless steels

d. Austenitic stainless steels

An interstitial solid solution is formed when _____________.

a. Solute atoms are smaller than solvent atoms

b. Solute atoms are larger than solvent atoms

c. Solute atoms are of the same size as solvent atoms

Body centered cubic structured materials have _____________.

a. 4 planes

b. 5 planes

c. 6 planes

d. 7 planes