Mechanical interview questions
What is the difference between isotropic and homogeneous material?
In homogeneous material the composition is same throughout and in isotropic material the elastic constants are same in all direction.
Explain the difference between the points of inflection and contra flexure?
At points of inflection in a loaded beam the bending moment is zero and at points of contra flexure in loaded beam the bending moment changes sign from increasing to decreasing.
What is the difference between proof resilience and modulus of resilience?
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.
What is the difference between column and strut?
Both column and strut carry compressive load. Column is always vertical but strut as number of structure could carry axial compressive load in any direction.
What are killed steals and what for these are used?
Killed steels are deoxidiseddin the ladle with silicon and aluminium. On solidification no gas evolution occurs in these steels because they are free from oxygen.
Which elements increase the corrosion resistance of steel ?
Chromium and nickel
What causes hardness in steel?
The shape and distribution of the carbide in the iron determine the hardness of the steel.
How heat treatment alters properties of steel?
Carbides can be dissolved in austenite in the basis of the heat treatment of steel. If steel is heated above the A1 critical temperature to dissolve all the carbides and the cooled suitable cooling through the cooling range will produce the desired size and distribution of carbides in the ferrite imparting different properties.
Define buckling factor?
It is the ratio of the equivalent length of column to the minimum radius of gyration.
What does the catenary cable does?
A cable attached to the supports and carrying its own weight.
What for pyranometer is used?
It is used to measure the total hemispherical solar radiation.
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.
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 strsss to the shearing strain within the elastic limit.
Describe transfer machines in brief ?
It is an automatic machine in which workpiece along with 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.
In homogeneous material the composition is same throughout and in isotropic material the elastic constants are same in all direction.
Explain the difference between the points of inflection and contra flexure?
At points of inflection in a loaded beam the bending moment is zero and at points of contra flexure in loaded beam the bending moment changes sign from increasing to decreasing.
What is the difference between proof resilience and modulus of resilience?
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.
What is the difference between column and strut?
Both column and strut carry compressive load. Column is always vertical but strut as number of structure could carry axial compressive load in any direction.
What are killed steals and what for these are used?
Killed steels are deoxidiseddin the ladle with silicon and aluminium. On solidification no gas evolution occurs in these steels because they are free from oxygen.
Which elements increase the corrosion resistance of steel ?
Chromium and nickel
What causes hardness in steel?
The shape and distribution of the carbide in the iron determine the hardness of the steel.
How heat treatment alters properties of steel?
Carbides can be dissolved in austenite in the basis of the heat treatment of steel. If steel is heated above the A1 critical temperature to dissolve all the carbides and the cooled suitable cooling through the cooling range will produce the desired size and distribution of carbides in the ferrite imparting different properties.
Define buckling factor?
It is the ratio of the equivalent length of column to the minimum radius of gyration.
What does the catenary cable does?
A cable attached to the supports and carrying its own weight.
What for pyranometer is used?
It is used to measure the total hemispherical solar radiation.
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.
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 strsss to the shearing strain within the elastic limit.
Describe transfer machines in brief ?
It is an automatic machine in which workpiece along with 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.
When the Mach Number is less than unity, the flow is called ?
Sub sonic flow
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