Interview Questions - Mechanical Engineering (Mixed bag)

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.

By which instruments the shear stress in fluids can be measured directly? 
By Stanton tube or Preston tube.

Explain the difference between the points of inflexion and contraflexure. 
At points of inflexion in a loaded beam, the bending moment is zero and at points of contraflexure in a loaded beam, the bending moment changes the 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 do you understand by critical points in the iron, iron-carbide diagram? 
The temperatures at which the phase changes occur are called critical points (or temperatures).

Define the buckling factor.
It is the ratio of the equivalent length of the column to the minimum radius of gyration.

Explain Bicycle Rear Wheel Sprocket working?
Rear wheel sprocket works under the principle of ratchet and pawl.

How to Find, Ductile-Brittle Transition Temperature in Metals?
The point at which the fracture energy passes below a pre-determined point for standard Impact tests. DBTT is important since, once a material is cooled below the DBTT, it has a much greater tendency to shatter on impact instead of bending or deforming.

What is the difference between P11 and P12 Pipes?
P11 the chromium molybdenum composition that is 1% of chromium and 1/4% of molybdenum P12 the chromium molybdenum composition that is 1% of chromium and 2% of molybdenum.

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