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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
What is an example of a shear strength?
scissors
garden shears
something like that........
also a zipper
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If you were to use 1 word it to describe Shear Force it would be Twisting. So basically things like:
Laffy Taffy
Pretzel
The game of Twister
Twisting a lock of hair
Tornadoes
Tendons/Muscles doing sports
What is the effect of pump installation in series and parallel connection?
if you connect the pumps in series, it will add head at the same flow rate. Inversely, in parallel connection, double the flow rate at same head.
What is better a two bladed turbine or a three blade one?
Power transfer is made through these blades. The more surface area the more power.
What is thickness in mm for 500 gauge and 200 gauge?
100 gauge = 1/1000 of an inch.
1 inch = 25.4mm
Therefore:
500 gauge = (5/1000) x 25.4mm = 0.127mm = 1.27 x 10-4m = 127 x 10-6m.
As we know 10-6 is a micro meter
Then: 500guage = 127 microns.
What is the name of the iron block on which a blacksmith hammers red-hot iron?
The main tool on which a blacksmith hammers hot iron or steel is an anvil. And the modern anvil is made of, or at least faced with, steel. This creates a hard steel work surface. To help shape the hot iron a blacksmith might use:
- A Bickern
- swage block
- A die set
- or any other hard material that would help shape the hot iron
Here is a fine length and distance converter. Scroll down to related links and look at "Length and distance converter".
Ultimate strength of steel in tension and shear?
Static and Dynamic Yield Stress: What's the difference and which should I use?The most commonly used method for obtaining a yield stress value is to shear the sample over a range of shear rates, plot the shear stress as a function of shear rate and fit a curve (various models are available) through the data points (see fig 1).
The intersection on the stress axis is then taken as the yield stress, the assumption being that any stress below this is insufficient to cause the sample to flow. Rheologists call this a dynamic yield stress; we are looking at the sample in motion (i.e. under shear) and extrapolating from this how it behaves when not in motion.
However, there's more than one way to skin a cat! Another approach is to start with the sample in its at-rest state (zero shear) and incrementally increase the stress until we identify at value at which it starts to flow i.e. we record non-zero shear rate (see fig 2)
We call this value a static yield stress - the stress at which we initiate flow - and it is usually considerably higher than its dynamic counterpart for any given product. In reality the sample is undergoing creep flow below this stress but we can assume for many practical purposes that it is static. This test can be performed with a quick (non-equilibrium) stress ramp on a controlled stress rheometer or a constant rate test on a vane-based tester.
So which yield stress should you use?
Well it depends on what you need to know. A good starting point is to match the test type to the flow process of interest: If you are interested in how a fluid stops flowing after shear (such as screen printing, dip coating, enrobing or slumping) then the dynamic yield stress is a key determinant. On the other hand if you are interested in how hard you need to push to get the fluid moving in the first place (spreadability of butters, texture of tubs of cream, mixer and pump start-up etc) then the product's static yield stress will prove a major factor.
What is the difference between saturated steam and Superheated steam?
Saturated steam occurs when steam and water are in equilibrium. If you have a closed container of water and heat it, above 100 celsius the steam pressure will start to rise, and as the temperature continues to rise, the pressure will go on rising. What is happening is that steam is being evolved to match the temperature (steam tables will give this relation) and the steam conditions are said to be saturated because if the pressure is raised by external means, some of the steam will start to condense back to water.
If the steam pressure is held at a lower level than that achieved at saturation, by taking steam off to feed a turbine or other steam usage, there is effectively an excess temperature for that pressure, and the steam is said to be superheated. It in fact then becomes dry, and behaves as a gas. The amount of superheat can be quantified as so many degrees of superheat (celsius or fahrenheit).
Turbine designers want steam to be superheated before reaching the turbine, to avoid condensation causing blade erosion, and steam producing boilers in power plants are designed to produce superheated steam. In plants where no turbines are used, only satured steam is normally generated.
In heating applications, saturated steam is preferable, because it has a better energy exchange capacity. Superheated steam must cool down, and become saturated steam, before condensing in a heat exchanger. Also, superheated steam is a thermal insulator, like air.
That is why it is necessary to direct superheated steam through a desuperheater before using the steam in heating applications.
What is the function of Balancing disc in multistage feed pump?
The balancing disc has a wear ring bolted to its face. The balance disc is removable and provides an easy way to replace the wear ring without removing the pump or dismantling the entire pump.
The wear ring thrusts against another wear ring bolted to the counter disc. This is a mechanism that prevents the rotating element from exceeding its travel which would result in loss of efficiency and later damage to the impellers. The two wear rings in a pump are made made of brass and the other steel respectively. The balance disc is removable and provides an easy way to replace worn wear rings without removing or dismantling the entire pump.
What does a helical gear look like?
Helical gears are similar to spur gear except it's teeth are slant. They have good load distribution, less noise and less wear compare to spur gear.
What is the maximum hydraulic pressure developed in a pump?
Hi . I am s.g.hegde
as a safer side working max. 600 bar depending upon hyd. Pump capacity available with you.
What sensors are used in automobiles?
resistive sensors
1. potentiometer
2. thermistor
3. piezo resistive
voltage generation sensor
1.piezoelectric
2.magnetic inductance
3.zirconia-dioxide
switch sensor
1. photo transisstor
2.speed sensor
3.G-sensor
actuators
1. stepper motor
2. solenoids
Working peinciple pf hydrualic cylinder?
Hydraulic fluid pressure cylinder with one hand and moving the piston to produce work.
- In real machines, there is always friction that reduces the efficiency of the machine.
- This reduces the mechanical advantage because some of the input force has to be used to overcome the force of friction in the machine.
- To reduce friction in the machine, you could add a lubricant such as oil.
What do you mean bu equivalent shear force and equivalent bending moment?
MAXIMUM SHEAR force bending moment is zero shear force change inside is called bending moment
What is the difference between steel rod and steel bar?
Rod is circular in shape. If u look it from where it starts, i.e. its cross sectional view it will be circular. It may or may not be hollow.
Bar's cross sectional view will be a quadrilateral.
Shivangini
A coupling is a gadget used to associate two shafts together at their closures to transmit control. Couplings don't ordinarily permit separation of shafts amid task, however there are torque restricting couplings which can slip or detach when some torque confine is surpassed.
How do you draw sketches in engineering drawing?
Technical drawings must be done with accuracy and must be easy to be understood. This can be done through manual sketching, through an instrument or even with the use of computer-aided drawing systems.
How much do you make an hour when welding?
There are far too many variables to provide an answer to this question. But we do know that for linear welds, like the joining of steel plates in something like, say, shipbuilding, a robotic welder can outweld any human welder. And the longer the time a study is conducted the farther the machine outpaces the man. But in welding, say, small piping with many elbows and tees, the human can outpace any robot. Welding rates vary with the geometry of the material being welded, and according to who or what is doing the welding, and under what conditions.
Which is more in heat transfer between parallel and counter flow heat exchanger?
Counterflow heat exchangers typically transfer more heat to a fluid simply because the hottest part of the exchanger is where the heating medium enters the heater and the heated medium leaves the heater. In a parrallel flow exchanger the hottest part of the heater is where the heating medium enters, and the coolest part where the heated medium enters, and some temperature in between is found where both exit the heater.
What are the sources of errors in youngs modulus experiment?
One inaccuracy can be that the wire or material that you are using to find Young's Modulus has some impurities and there may be a slight variation in the cross sectional area so a shorter piece of that material should be used.
What does relation carbon equivalent with tensile strength?
Higher the carbon the steel will have higher TS up to certain point.
Pressure is an effect which occurs when a force is applied on a surface.
Mathematically pressure is: p = F / Awhere: * p is the pressure,
F is the normal force,
A is the area.
