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Mechanical Interview Questions and Answers: Students those who are from the Mechanical branch and looking for the Mechanical Questions and Answers those are right place!! We have provided the Mechanical Questions along with answers. Basic Mechanical Questions are listed out here, Students who are from a Mechanical stream and going to take job interview those can now check the basic Mechanical engineering questions here. We have collected frequently asked interview Mechanical questions and answers from MNC’s companies. All those Mechanical Technical Questions are specified in this page, Students who want to crack the Job interview those can check the typical mechanical engineering interview questions.
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Basic mechanical engineering objective questions and answers pdf
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General mechanical engineering questions with answers pdf
- What is the difference between isotropic and anisotropic materials?
If a material exhibits same mechanical properties regardless of loading direction, it is isotropic, e.g., homogeneous cast materials. Materials lacking this property are anisotropic.
- What are orthotropic materials?
It is a special class of anisotropic materials which can be described by giving their properties in three perpendicular directions e.g. wood; composites.
- What is view factor?
View factor is dependent upon geometry of the two surfaces exchanging radiation.
- Mention two types of dislocations.
Dislocation refers to a break in the continuity of the lattice. In edge dislocation, one plane of atoms gets squeezed out. In screw dislocation the lattice atoms move fom their regular ideal positions.
- What are the principal constituents of brass?
Principal constituents of brass are copper and zinc.
- What is Curie point ?
Curie point is the temperature at which ferromagnetic materials can no longer be magnetised by outside forces.
- Specific strength of materials is very high when they are in fibre size but lower when they are in bar form Why ?
Crystal structure has ordered, repeating arrangement of atoms. Fibres are liable to maintain this and thus have high specific strength. As size increases, the condition of ordered and repeating arrangements can’t be guaranteed because of several types of defects and dislocations and thus the specific strength gets lower.
- What is the percentage of carbon in cast iron ?
- Which element is added in steel to increase resistance to corrosion ?
- Whether individual components in composite materials retain their characteristics or not?
- An elastomer is a polymer when its percentage elongation rate is ?
Greater than 100%.
- If percentage elongation of a material is more than 200%, it is classed as ?
- Why is it that the maximum value which the residual stress can reach is the elastic limit of the material ?
A stress in excess of elastic limit, with no external force to oppose it, will relieve itself by plastic deformation until it reaches the value of the yield stress.
- Why fatigue strength decreases as size of a part increases beyond around 10 mm?
Perfection of material conditions is possible at lower sizes and as size increases, it is not possible to attain uniform structure of the material.
- Distinguish between creep and fatigue.
Creep is low and progressive deformation of a material with time under a constant stress at high temperature applications. Fatigue is the reduced tendency of material to offer resistance to applied stress under repeated or fluctuating loading condition.
- Which theories of failure are used for (a) ductile materials, and (b) brittle materials ?
For ductile materials, theories of failure used are maximum shear stress theory, and maximum energy of distortion theory; while for brittle materials, theory of maximum principal stress, and maximum strain are used.
- What does thermal diffusivity of metals signify.
Thermal diffusivity is associated with the speed of propagation of heat into solids during changes in temperature with time.
- For conduction of heat, the instantaneous rate of heat flow is product of three factors. What are these ?
Ans: Area of the section of the heat flow path, perpendicular to the direction of heat flow.
temperature gradient, i.e. change of temperature w.r.t. length of path.
Thermal conductivity of material.
- How convective heat transfer is effected and on what factors it depends ?
Convective heat transfer is effected between a solid and fluid by a combination of molecular conduction within the fluid in combination with energy transport resulting from the motion of fluid particles. It depends on boundary layer configuration, fluid properties and temperature difference.
- Which is the common element between brass and bronze ?
- What does following alloy designation indicate FG 250 ?
Grey cast iron with tensile strength of 250 MPa.
- How is ceramic defined ?
It is a solid formed by combination of metallic and non-metallic elements.
- Give one example of metal classified as per structure as BCC, FCC, HCP and CCP.
Ans: BCC (body centred cubic) structure—Molybdenum
FCC (face centred cubic) structure—Aluminium
HCP (hexagonal closed packed) structure—Zinc
CCP (cubic dosed packed) structure-Copper.
What is the name of solid solution of carbon in alpha iron and delta iron ?
Ferrite and austenite respectively.
- Explain the difference between pearlite and cementile ?
Pearlite is eutectoid mixture of ferrite and cementile. Cementite is chemical compound of iron and carbon.
- Give one example each of the following proportion of materials dimensional, physical, technological and mechanical.
Roughness, enthalpy, toughness, and hardness respectively.
- For which parts the Wahl factor and Lewis form factor used ?
For springs and gears respectively.
- How oxygen can be removed from steel during melting? What are fully killed steels ?
Oxygen can be removed by adding elements such as manganese, silicon or aluminium which, because of their high affinity for oxygen, react with it to form non-metallic oxides which rise into the slag. Steels which have had most of their dissolved oxygen removed are called “fully killed steels”.
- Hydrogen cannot be removed easily from molten steel. What harm hydrogen has on property of steel ?
Execessive hydrogen results in the formation of small fissures often described as hairline cracks or flakes in the steel. Large forgings in alloy steel are particularly sensitive to this phenomenon.
- What is allotrope ? In what forms of cubic pattern, iron exists ?
Some elements exist in more than one crystalline form. Each form is known as “allotrope”. Iron exists in two forms of cubic pattern, namely body centered cubic (bcc) and face-centered cubic (fee).
- What is the difference between alpha iron, delta iron and gamma iron ?
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 referred to as “gamma-iron”.
- What is isotropic material ?
It is a material having same elastic constants in all directions.
- Explain difference between modulus of resilience and modulus of rigidity ?
Modulus of resilience is the maximum strain energy stored in a material per unit volume and modulus of rigidity is the ratio of shearing stress to the shearing strain within the elastic limit.
- What is the difference between basic hole and basic shaft ?
A basic hole is one whose lower deviation is zero and in case of basic shaft the upper deviation is zero.
- What for pyranometer is used ?
It is used to measure the total hemispherical solar radiation.
- Describe transfer machines in brief.
It is an automatic machine in which workpiece alongwith fixture is transferred from one station to other automatically and several operation on workpiece are performed at each station.
- What is burnt-out point ?
It corresponds to maximum heat flux at which transition occurs from nucleate boiling to film boiling.