Most important terms & units for mechanical engineer
mechanical engineer basic term & basic units
Torque=(F)force* r(perpendicular distance from the center of axis)
Couple- A pair of two equal and unlike parallel forces(force equal in magnitude with line of action parallel to each other & acting in opposite directions) is known as couple.
Moment= turning force× distance
Stress- P/A force/area
Strain- change in length/original length
Spring-like is an element of elastic in which the energy is stored when force is applied and regain its original shape when the load is removed.
Stiffness- it is the property of material to resist the elastic deformation under the action of external load called as stiffness.
Specific weight- it is weight per unit volume of fluid.
Specific volume- it is the volume per unit mass of fluid.
Specific gravity- specific weight of fluid/specific weight of standard fluid
Viscosity- it is the property of fluid in which one layer opposes the other layer of fluid.
dynamic viscosity- it is the quantity Expression of fluid's resistance to flow(shear).
Kinematic viscosity- it is the ratio of the viscous force to interia force
Dynamic viscosity/density
Buyouncy- when an object is immersed in a liquid the opposite force is developed which is upward force & and pushes the object upward.
Bernoulli's equation-
P1+potential energy+ kinetic energy= P2+ potential energy + kinetic energy
Devices for fluid- manometer, mechanical gauges- diaphragm type, Bourdon's pressure gauge, bellow's type pressure gauge
Mach number- Velocity of object/Velocity of sound
Fluid flow- when liquid in the motion
Is know as fluid flow
Draft tube- it is the element of the runner or turbine
It is located at the upward of runner for the liquid to flow through it.
First law of thermodynamic- energy can neither be created or nor be destroyed it just can be converted in one form to another.
Second law- the heat always flow from hot body to cold body.
Third law- at absolute zero the entropy of perfectly crystalline substance is zero.
Entropy- it is the transformation
It is heat loss/ time
The entropy of the universe is changing.
Clarofic value of fuel- total amount of heat liberated when unit mass or unit volume of a fuel is completely burnt in presence of excess supply of oxygen
Boiler- it is used to convert water to steam or vapour
Economizer- it is type of device used for heat exchange it is also know as heat exchanger.
Superheater- it is used to increase the temperature of fluid above its saturation temperature.
Air preheater- these are waste recovery device in which air on its way to furnance is raised in temperature by help of flue gases.
Tubular preheater-
Plate Air preheater-
Boiler draught- it is the device in which the Exhaust or burnt gases are removed to atmosphere through chimney.
Scavnging- it is the process of removing Exhaust gases from the cylinder or burnt gases from cylinder.
Supercharging- in this process the air from the Atmosphere is taken and is been compressed by mixing of Air& fuel.
Turbocharging- inlet air compressor for an internal combustion engine(petrol or diesel)powered from the exhaust air.
Flywheel- it is a device in which the energy is stored and is supply when ever required is generally stored in power stroke.
Energy- the ability to do the work
Power- work done/time taken
Force- m.a
Velocity- displacement/time
Speed- distance/time
Appearance- the final look of product
Comfort- the design should be such that will be easier or comfort the customer.
Work done= force×displacement
Electrode- it is device through which the electricity enters or remove from the object.
Basic units-
1kilometer=1000meter
1hectometer=100meter
1deckameter=10meter
1decimeter=1/10meter
1centimeter=1/100meter
1millimeter=1/1000meter
Basic unit
Meter,Liter,gram
Distance,capacity,weight
1inch=25.4mm 1liter=1000ml
1inch=2.54cm 1day=24hour
1inch=0.0254m 1hour=60minute
1inch=2.54×10^-5 1minute=60second
1inch=0.0278yard
1yard=36inch
1yard=0.914meter
1foot=12inch
1tonne=1000kg
1pound=0.454kg
1kg=2.205pound
1tr=12000 BTU
The above are important terms & units which a mechanical engineer should know
Before going to interview.
Along this there are also lots of concept & terms which we will discuss further in another post. But the above are most important terms.
Comments
Post a Comment