Important Question and Answer for Mechanical Engineer Interview

Mechanical Engineer Interview Question for Fresher 

Important Question for Mechanical Engineer in Interview

Ques. What is curie point ?

Ans. Curie point is the temperature at which ferromagnetic materials can no longer be magnetised by outside forces.

Ques. What is the percentage of carbon in cast iron ?

Ans. 2.5%

Ques. What element is added in steel to increase resistance to corrosion ?

Ans. Chromium.

Ques. What is the difference between permeability and porosity ?

Ans. Permeability is the easeness with which the sand mould allows the gases to escape through it. Porosity is the ratio of air voids to sand grains.

Ques. What is the metallic structure of mild steel ?

Ans. Body centred cubic structure (BCC).

Ques. What is the difference between alpha iron, delta iron and gamma iron ?

Ans. The bcc form of iron exists between room temperature and 910°C ,and between 1400°C and the melting point at 1539°C. The lower temperature form is known as "alpha iron" and the higher temperature form as "delta" iron .The face-centered cubic form existing between 910°C and 1400°C is reffered to as "gamma-iron".

Ques. What is the difference between proof resilience and module of resilience ?

Ans. Proof resilience is the maximum strain energy that can be stored in a material without permanent deformation.Modulus of resilience is the maximum strain energy stored in a material per unit volume.

Ques. What is stellite  ?

Ans. It is a non-ferrous  cast alloy containing cobalt, chromium and tungsten.

Ques. Which rays are produced by cobalt-60 in industrial radiography ?

Ans. Gamma rays.

Ques. What is critical temperature in metals ?

Ans. It is the temperature at which the phase change occur in metals.

Ques. Which material are used for made the car tyres ?

Ans.Styrene-butadiene rubber.

Ques. What is the structure of pure iron and whatever it is soft or hard ?

Ans. Ferrite and it is soft.

Ques. Define buckling factor ?

Ans. It is the ratio of the equivalent length of column to the minimum radius of gyration.

Ques. What is coaxing ?

Ans. It is process of improving fatigue properties by first under-stressing and then increasing the stress in small increments.

Ques. What is a ceramic ?

Ans. It may be defined as a solid formed by the combination of metallic and nonmetallic elements. Some examples are Zirconium ,tungsten carbide (WC),Boron nitride(BN)

Ques. What is an elastomer ?

Ans. An elastomer is a polymeric material that has elongation rates greater than 100% and a significant amount of resilience. Some example are : Polyisoprene,Neoprene,Nitrile.

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