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Mechanical Engineering
Mechanical Engineering is a branch of engineering that encompasses the generation and application of heat and mechanical power and the design, production, and use of machines and tools. Mechanical engineering involves application of the principles of dynamics, control, thermodynamics and heat transfer, fluid mechanics, strength of materials, materials science, electronics, and mathematics.
10,989 Questions
How is wool comparatively stronger than steel?
wool has many crimps so it can carry steel and it is elastic
Does heat reduce the tensile strength of metal?
Heating a metal decreases the tensile strength and increases ductility
What is the correct method of putting out a reciprocating induction fire?
i have a feeling your doing worksheet number 1 ground operations at the aviation institute of maintenance lol
Nominal moment is the entire calculated moment after applying load...
According to my understanding it is the pressure that gets applied on the measured body by the instrument itself.
For excample: If u are measuring a cube with a vernier caliper then there is a chance that a error may occur due to the pressure applied by the teeth of vernier caliper while tightening it..
What is proof Stress for Steel?
proof stress can be found by referring to the stress/strain curve at the point where strain is = 0.2% original volume (the material has grown 0.2% in volume)
proof stress will be given as a measurement of energy (MPa,KPa etc.)
as it specifically refers to the amount of energy required to stress the material to 0.2% its original volume.
What are limitations in Rockwell hardness test?
Limitations:
1. Depth of penetration should not exceed 1/8˝ of thickness of material.
2. No test should be performed near closer to the edge of the specimen.
3. All the locations for testing the specimen should be evenly distributed over the phase of material.
What is the largest allowable minor diameter for an M6x1.0 screw thread?
the minor diameter should be between 4.917mm and 5.153 mm, so the largest allowable size is 5.153mm
What is the process of joining metal parts by fusion?
1. _________ is the process of joining metal parts of fusion. The process of joining metal parts by fusion is known as arc welding.
What is the effect of boron content on steel?
A small amount of boron (~0.1%) will make steel very very hard. So hard in fact that it can be used effectively in cutting tools or in applications where durability/long life are required. However, this alloy is quite susceptible to temperature change and so shouldn't be used in hot applications.
What do mean by flux and slag?
In (SMAW) Shielded Metal Arc Welding 'stick welding':
Flux is the substance added to to molten metals to bond with impurities that can be readily removed.
Slag is the waste material which is removed.
What is a long steel product and what is a flat steel product?
Long products-
such as billets, blooms, rebars, wire rod, sections, rails, sheet piles and drawn wires find their main markets in industries related to construction, mechanical engineering, energy and automotive.
Flat products- such as slabs, hot-rolled coil, cold-rolled coil, coated steel products, tinplate and heavy plates are used in automotive, heavy machinery, pipes and tubes, construction, packaging and appliances
What is the classification of cast iron?
- Grey cast iron
- White cast iron
- Malleable cast iron
- Ductile cast iron
How do you calculate swl of crane?
Cranes typically are designed with a FoS (Factor of Safety) of 5x the MBL (Minimum Breaking Load). So if the weakest part of the structure failed (e.g. in tension, compression or shear) at e.g. 100kN (10 metric tons), then the swl would be 10t / 5 = 2 tons
What is relation between PSI and bar?
PSI and Bar are units of pressure. PSI is pounds per square inch. The conversion rate between the two is one bar is equal to 14.5038 PSI. Bar is a non-SI measurement of pressure.
Yes. It is considered "Mild" Steel due to the low amount of carbon in the steel.
What are called principle planes and principle stress?
The principle stress is a maximum tension stress in a body where shear stress is zero and it acts on the principle plane. If a body is under both tension and shear then the principle stress is higher than the initial tension stress. You can calculate this and find the principle plane angle using Mohr Circle analysis or equations.
What is the fracture toughness of mild steel?
The fracture toughness, or the property that describes the ability of a material containing a crack to resist fracture, of mild steel is around 50 K (where 'K' is the stress intensity factor).
What is difference between limit of proportionality and tensile strength?
The proportional limit is the stress value at which the stress is no longer linear with strain. After that, the material will begin to yield and become non-linear, or plastic, and then it will fail at a higher value called the tensile strength. For most metals, the proportional limit is well below the tensile strength; for example annealed stainless steel has a proportional limit near 30 ksi and tensile strength of 80 ksi; aluminum has a proportional limit of 35 ksi and tensile strength of 42 ksi.
What is grading modulus in road materials?
Gives an indication of the relationship between fine material and coarse material in a gravel mix. The higher the GM the more coarse material.
What is the difference between applied mechanics and engineering mechanics?
Both are Same, Applied Mechanics is commonly referred to as engineering mechanics
What is HP and LP turbine expansion?
HP Turbine is High Performance Turbine
LP Turbine is Low Performance Turbine
What are the operations carried out on lathe?
The main operations on a lathe are
-turning( reducing diameter)
-facing( reducing length)
-tapering( making a conical shape)
-knurling( making a diamond shaped pattern for easy grip)
-grooving( making a symmetrical indentation)
-parting( removing a section)
-eccentric turning( turning about a point other than axis)
-chamfering( creating a radially symmetrical chamfer)
others include boring, drilling etc.
