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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 do I get past exam papers with answer for peo in mechanical field?
you have to order from PEO (pay for the papers)
What is the difference between buckling and crippling?
Buckling Load: It is the highest load at which the column will buckle.
Crippling Load: It is the max load beyond that load, it cant use further it becpomes disable to use.
The buckling Load < The Crippling Load
Safety load= Crippling Load/ Factor of safety
What are the three most common metal crystal structure list five metals?
a- However most metals and many other solids have unit cell structures described as body center cubic (bcc), face cantered cubic (fcc) or Hexagonal Close Packed (hcp).
1- iron
2- sodium
3- gold
4- cooper
5- zinc
Difference between level trigger and edge trigger filp fliop?
in level trigger mode, the input signal is sampled when the clock signal is either high or low whereas in edge trigger mode the input signal is sampled at rising or at the falling edge.
lever triggering is sensitive to glitches whereas edge trigger is non sensitive..
example: latch for level trigger and flip-flop for edge trigger
An idler gear is a gear which connects two other gears so they will turn in the same direction. :)
What science skills does a chef have?
Well, interesting question. We use the usual, scientific method, so we can find what our project will taste and look like. And we also use chemistry because some foods,well, don't go together.
How much clearance between shaft diameter and labyrinth seal?
Labrynth seal clearances depend up the diameter of the rotating shaft, bearing clearance & temperature of the lubricating medium. As ageneral thumb rule the clearance must be 0.03 mm per 1" dia of shaft.
What is the melting temp of mild steel?
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What are the disadvantages of using a shaper machine?
The disadvantages of using a shaper machine are s many. There are higher chances of injury that may cut deep into the skin.
the relay used to protect the generator/motor from overload currents. And to protect insulation of the stator windings.
What is the working principle of transmitter?
There are many types of transmitters. Thesimplest is the Amplitude Modulated (AM) transmitter. This is an oscillator that cycles at a predetermined frequency. This oscillator puts out a level of energy that is varied by the sounds that you desire to transmit. This variance is done from 100% of the signal to 0%. The output then is two frequencies combined one at the stations frequency and one at the frequency of the sound transmitted. The receiver throws away the transmission frequency and amplifies the frequency of the sound.
Bottom line is you only hear the sound stuck into the transmitter.
F.M. is the same as AM but instead of varying power, we vary the frequency with the desire sounds we want to hear. The receiver sees that variance and converts that to sound.
Phase shift, DSB, SSB and the others are merely more complex variances to these basics.
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What is the difference between a mechanical mechanism and a non-mechanical mechanism?
the difference between a mechanical and non-mechanical system is that non-mechanial systems is a procedure/process designed to perform a task along with people involved (example, the school system is a non-mechanical system because it involes students, teachers, desk, textbooks etc)
a mechanical system is group of physical parts that interact with each other and function as a whole in order to finish the task (example, the TTC system involes the buses, subways, etc)
Can you weld a slip on flange to a 90 degree elbow?
Sure why not its the same as welding it to a straight piece of pipe
The load force is applying a force to move or hold an object that has weight.
What are advantages of grinding machine?
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mainly surface grinding machines, for processing flat surfaces
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To improve the roughness of the processing surface
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grinding away a few wires to facilitate assembly
If you are interested in grinding machines, you can go to VIDO's official website to check, VIDO's grinding machines are of high quality and are the choice of the public.
Which travel faster than light or sound waves?
Which of them travel faster - light or sound waves?
Light waves travel in vacuum with the speed of light c = 299792458 m/s or 983571056 ft/s.
Sound waves travel at 20°C (68°F) with the speed of sound c = 343 m/s or 1125.33 ft/s.
So light travels 874,030 times faster than sound.
Don't forget that sound needs necessarily air as a medium.
Light does not need a medium; vacuum is O
Explain working of a DC Generator with diagram?
A dc generator is a machine which works on the principle of electro magnetic induction $it converts the mechanical energy into electrical energy.
How do you increase hardness of mild steel?
You heat your object until its hot red and then you cool it quickly in water
Which types of threads used in screw jacks?
There are many various types of screw jacks and mechanical actuators. Examples include metal screw jacks, rotating screw jacks, inverted screw jacks and vertical screw jacks.
How do you convert a hardness number into tensile strength?
F - Force (N)
A- cross sectional area (mm2)
A- cross sectional area - Width *thickness (single wall)
So F/2(width * thickness) (N/mm2)
For Example :-
F= 35.963 N
width = 6.35 mm (specimen width standard in finger cots)
Thickness = 0.12 mm
Calculation:-
= F/ 2(Width *Thickness) (N/mm2)
Where 2 is common factor for ring samples .
= 37.963 / 2(6.35*0.12) (N/mm2)
= 37.963 /1.524 (N/mm2)
= 24.91 (N/mm2) this is good answer for finger cots and condom Tensile strength calculation.
You stretch test specimens in a prescribed manner (ASTM) and make note of what force failure occurs. The tensile strength is that force divided by the cross-sectional area.
