Interview Questions.

Question 1. What Is The Difference Between The Isotropic And An Isotropic Materials?

Answer :

If a material reveals equal mechanical residences irrespective of loading route, it's far isotropic.
Ex:homogeneous forged materials. Materials lacking this property are anisotropic.

Question 2. What Are Orthotropic Materials?

Answer :

Orthotropic substances are a unique elegance of isotropic substances which can be defined by using giving their residences in three perpendicular directions
ex: wooden; composites.

Mechanical Engineering Interview Questions
Question 3. A Plain Carbon Steel Has Brinell Hardness Number (bhn) Of 180. What Are The Values Of Rc, Vhn And Ultimate Strength?

Answer :

Rc = BHN/10 = 18, VHN = BHN = one hundred eighty

Ultimate energy = 3.Forty eight × BHN MPa = 620 MPa.

Question 4. What Properties Are Needed To Be Considered For Application Calling For Following Requirements?
I) Rigidity.
Ii) Strength Of No Plastic Deformation Under Static Load.
Iii) Strength To Withstand Overload Without Fracture.

Answer :

i) Reliability – elastic modulus and yield electricity.

Ii) Strength (for no plastic deformation below static loading) – yield point.

Iii) Strength (overload) – Toughness and impact resistance.

Iv) Wear resistance – Hardness.

V) Reliability and safety – Endurance restriction and yield.

Question five. Explain The Effects Of Alloying Chromium And Nickel In Stainless Steel.?

Answer :

The addition of nickel and chromium increases the tensile strength and increase in resistance to corrosion takes place.

Manufacturing Industries Interview Questions
Question 6. Mention Two Types Of Dislocations?

Answer :

Dislocation refers to a destroy within the continuity of the lattice. In an edge dislocation, one aircraft of atoms receives squeezed out. In screw dislocation, the lattice atoms pass from their normal perfect positions.

Question 7. What Are The Principal Constituents Of Brass?

Answer :

Principal elements of brass are copper and zinc.

Thermodynamics Interview Questions
Question eight. What Is Curie Point?

Answer :

Curie factor is the temperature at which ferromagnetic substances can now not be magnetized by way of out of doors forces.

Question nine. Specific Strength Of Materials Is Very High When They Are In Fibre Size But Lower When They Are In Bar Form - Why?

Answer :

The crystal shape has ordered, repeating association of atoms. Fibers are liable to preserve this and for this reason have excessive particular power. As for size increases, the circumstance of ordered and repeating preparations can’t be guaranteed because of numerous forms of defects and dislocations, and accordingly the precise electricity receives decrease.

Metallurgy Interview Questions
Question 10. What Is The Percentage Of Carbon In Cast Iron?

Answer :

2.5%.

Question 11. Which Element Is Added In Steel To Increase Resistance To Corrosion?

Answer :

Chromium.

Virtual Iron Interview Questions
Question 12. Whether Individual Components In Composite Materials Retain Their Characteristics Or Not?

Answer :

Yes.

Mechanical Engineering Interview Questions
Question 13. Why Is It That The Maximum Value Which The Residual Stress Can Reach Is The Elastic Limit Of The Material?

Answer :

A stress more than the elastic restrict, with out a external pressure to oppose it, we relieve itself by plastic deformation until it reaches the price of the yield strain.

Question 14. Why Fatigue Strength Decreases As Size Of A Part Increases Beyond Around 10mm?

Answer :

The perfection of cloth situations is viable at decrease sizes, and as size will increase, it is not feasible to achieve a uniform structure of the cloth.

Question 15. Distinguish Between Creep And Fatigue?

Answer :

Creep is low and progressive deformation of a cloth with time underneath a constant pressure at high-temperature programs. Fatigue is the decreased tendency of material to provide resistance to implemented stress below repeated or fluctuating loading situation.

Nanotechnology Interview Questions
Question 16. While Normal Carburizing And Nit Riding Surface Treatments Increase Fatigue Strength, Excessive Treatment May Decrease The Fatigue Strength. Why?

Answer :

Normal carburizes/nits riding treatments will increase volume because of phase transformation at the surface and introduce residual compressive floor strain and as a result increases fatigue power. By excessive treatment, the high compressive stresses ae added however those are balanced through high inner elastic stresses of equal cost, and the surface fatigue cracks can also develop within the regions of the high tensile strain and lead o early fatigue failure.

Question 17. List At Least Two Factors That Promote The Transition From Ductile To Brittle Fracture?

Answer :

The manner of loading and the rate of loading promote the transition from ductile to brittle fracture. A gadget member may additionally have ductile failure below static loading however can also fail in brittle fashion whilst the burden is fluctuating. Similarly a fabric may also evidence ductile failure below tensile loading at ordinary checking out pace, however if the burden is carried out at a excessive pace then failure can be brittle.

Electrochemistry Corrosion Interview Questions
Question 18. Which Theories Of Failure Are Used For? (a) Ductile Materials (b) Brittle Materials?

Answer :

For ductile substances, theories of failure used are most shear pressure principle and most strength of distortion concept;

For brittle substances, the idea of maximum major strain and maximum pressure are used.

Manufacturing Industries Interview Questions
Question 19. What Is The Common Element Between The Brass And Bronze Metal Alloys?

Answer :

Copper.

Question 20. What Does The Alloy Designation Fg 250 Indicate?

Answer :

FG 250 alloy designation suggests Grey forged iron with a tensile energy of 250 MPa.

Manufacturing Industrial Engineer Interview Questions
Question 21. Define Ceramic?

Answer :

Ceramic is a stable formed by way of the combination of metal and non-metallic elements.

Question 22. Give One Example Of Metal Classified As Per Structure As Bcc, Fcc, Hcp And Ccp?

Answer :

Examples of BCC, FCC, HCP and CCP systems:

BCC (Body Centred Cubic) shape – molybdenum;

FCC (Face Centred Cubic) shape – Aluminum;

HCP (Hexagonal Close Packed) shape – Zinc;

CCP (Cubic Close Packing) shape – Copper.

Question 23. What Is The Name Of Solid Solution Of Carbon In Alpha-iron And Delta Iron?

Answer :

Ferrite and Austenite respectively.

Sheet Metal Interview Questions
Question 24. Explain The Difference Between Pear Lite And Cementite?

Answer :

Pearlite is a eutectoid combination of ferrite and cementite. Cementide is a chemical compound of iron and carbon.

Thermodynamics Interview Questions
Question 25. Give One Example Each Of The Following Proportion Of Materials – Dimensional, Physical, Technological And Mechanical?

Answer :

Roughness, enthalpy, toughness and hardness respectively.

Question 26. For Which Parts The Wahl Factor And Lewis Factor Is Used?

Answer :

Wahl thing and Lewis component is used for springs and gears respectively.

Material Handler Interview Questions
Question 27. How Oxygen Gas Can Be Removed From Steel During Melting? What Are Fully Killed Steel?

Answer :

Oxygen fuel may be eliminated from metal during melting through adding elements along with manganese, silicon or aluminium which, because of their high affinity for oxygen, react with it to shape non-metal oxides inclusive of manganese oxide, silicon oxide and aluminium oxide. Which upward push into the slag. Steels in which have has most of their dissolved oxygen eliminated are called ‘absolutely killed steels’.

Metallurgy Interview Questions
Question 28. Hydrogen Cannot Be Removed Easily From Molten Steel. What Harm Hydrogen Has On Property Of Steel?

Answer :

Excessive hydrogen in molten steel consequences inside the formation of small fissures regularly described as hairline cracks or flakes within the steel. Large forgings an alloy steel are specially touchy to this phenomenon.

Question 29. What Is Allot Rope? In What Forms Of Cubic Pattern, Iron Exists?

Answer :

Some factors exist in more than one crystalline shape. Each crystalline shape is known as ‘allotrope’ of the detail. Iron exists in  crystalline varieties of cubic pattern, particularly, body-centered cubic (BCC) and face-targeted cubic (FCC).

Question 30. When A Material Is Known As Allotropy Or Polytropic?

Answer :

A material is called allotropic aur polytropic if it exists in numerous bureaucracy at a unique temperature.