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Engineering
Engineering is an art and profession devoted to designing, constructing, and operating the structures, machines, and other devices of industry and everyday life.
5,839 Questions
Why is there a twist in a propeller blade?
to keep the angle under which propeller section sees the relative velocity. Because,
a propeller essentially is a wing which rotates around an axis parallel to the flight velocity. wings operate best at a certain angle of attack, which is an angle at which wing 'sees' the flow. now, propellers rotate and tangential velocity increases from root to tip. airflow velocity is obviously constant. tangent of angle between relative velocity and prop section is air velocity / tangential velocity. we want angle between propeller section and relative velocity to constant, since tangent changes from root to tip , we need to change angle of propeller section itself.
What is the syllabus of b.e in aeronautical engineering of vtu?
What is the syllabus of aeronautical engineering of b.e. 1st semester in v.t.u.
What does an aeronautical engineer?
aeronotical engineer repair,manufacture,maintaines the aeroplane,and check the probleem"s off a plane
Who decides how big a gear should be a scientist a engineer or a technologist?
The engineer that designs the gearbox. The sizes of the bull gear and pinion gear(s), as well as any idler gear(s) are dependent upon the sizes of the drive and driven shafts and the torque that will be applied to each, as well as the ratio of gear reduction, and speed of rotation.
Advantages and disadvantages of suspension bridges?
It is good that they are flexible, however when very bad weather happens it can be bad. They are also bad for heavy loads. Two advantages are that they can be built high and they do not require a lot of material to be built.
Describe at least six items of data that might be recorded in a station model?
1) Temperature
2)Dew point
3)Wind speed
4)Air pressure
5)Fog
6)Precipitation
What is the Schematic symbol for pressure sensor?
unfortunately i only know the HYDRAULIC symbol for pressure GAUGE. I hope that helps. Anyways, its basically a circle, with a line sticking out the bottom. Looks like a lolly-pop.
Inside the circle is an arrow, pointing either upwards to the right, or upwards to the left. But not straight up (confusing since this is similar to the symbol for hydraulic pump!)
There is a site called FESTO, which has a list of electrical, pneumatic and logic symbols.
hope this helps!
What is wastewater engineering?
This is a course offered where a person undergoes wastewater training for designing and managing wastewater treatment and disposal.
On a more detailed manner, he is responsible for the design (engineering) of a system to capture and treat wastewater, whether it is runoff, sewage, etc., so the final product is reuseable or redirected.
Why is the center line the most important part of sketching a circle?
pleas answer the question http://wiki.answers.com/Q/Why_is_the_center_line_the_most_important_part_of_sketching_a_circle"
Multiple products have been named "nano water". They are generally quack medical cures or water filters.
Normal width of a single car garage is 8' feet.
Normal width of a double car garage is 16' feet.
These answers are for doors typically found in the USA.
How hard is Jasper the gem on the moh hardness scale?
Jasper is a hardness of 7 on Mohs scale. Jasper is a type of Chalcedony, a variety of quartz (silicon dioxide) often with some iron and aluminum. Jasper gets it's colors from iron oxides.
What is the heaviest fighter plane today?
The FB-111D swept wing fighter of 1960-1970s weighed 82,843 lb (37,577 kg). This aircraft is retired from military service but some are still on display. This may notbe the largest but it is big.
There are so many different types of sludge that can be created. Sludge types can include but are not limited to chemical.
*Any flange having different MOC bears the rating with respect to international standards like ANSI B16.5.
*It is a designed pressure that a flange can withstand.
*For example a flange is having the following specification:
25NBX150#,FORGED CARBON STEEL as per ANSI B16.5
is having 150 psi flange rating.
It can withstand 150 psig pressure safely.
(Noting that in most cases the pressure-temperature charts of a given spec will allow for normal operating pressure to far exceed the class rating at ambient temperature. For example a 150# flange in A105 Carbon Steel will rate for 285PSI at -20 to 100 Degree F. For more information see www.texasflange.com The original intent was to class the parts to safely hold the given pressure at relatively high temperature. Since often times the operating temperatures are much lower the flanges can usually be used well above their given rate. When in doubt take your design criteria to a company that deals in it and ask for the specifics.)
*Pipe flanges that are made to standards called out by ASME/ANSI B16.5 or ASME/ANSI B16.47 are typically made from forged materials and have machined surfaces. They are typically in "Pressure Classes" such as 150#, 300#, 600#, 900# 1500#; however, ASME B16.47 still recognizes the 75# or "Class 75" flange for certain low pressure and low temperature applications. These "Pressure Classes" have both pressure and temperature ratings for specific materials. The flange faces are made to standardized dimensions and are typically "flat face" "raised face" "tongue and grove" or "ring joint" styles, although other obscure styles may be permitted. Flange designs are available as "welding neck" "slip-on" "lap joint" "socket weld" "threaded" and also "blind flange". The gasket type and bolt type are generally specified by the standard(s); however, sometimes the standards refer to the ASME Boiler and Pressure Vessel Code (B&PVC) for details ( see ASME Code Section VIII Division 1 - Appendix 2 ). These flanges are recognized by ASME Pipe Codes such as ASME B31.1 Power Piping, and ASME B31.3 Process Piping. Materials for flanges are usually under ASME designation: SA-105 , SA-266 or SA-182.
*Please visit following link and download the software, you will get both pressure v/s temperature rating of flange:
What are the different types of jamming?
Intentional communications jamming is usually aimed at radio signals to disrupt control of a battle.
A transmitter, tuned to the same frequency as the opponents' receiving equipment and with the same type of modulation, can, with enough
power, override any signal at the receiver.
The most common types of this form of signal jamming are
random noise
random pulse
stepped tones
warbler
random keyed modulated CW
tone
rotary
pulse
spark
recorded sounds
gulls
sweep-through.
These can be divided into two groups - obvious and subtle.
Obvious jamming is easy to detect because it can be heard on the receiving equipment.
It usually is some type of noise such as
stepped tones (bagpipes)
random-keyed code
pulses,
music (often distorted)
erratically warbling tones
highly distorted speech
random noise (hiss) and recorded sounds
Various combinations of these methods may be used often accompanied by regular Morse identification signal to enable individual transmitters
to be identified in order to assess their effectiveness. For example, China, which used jamming extensively and still does, plays a loop of
traditional Chinese music while it is jamming channels.
The purpose of this type of jamming is to block out reception of transmitted signals and to cause a nuisance to the receiving operator. One
early Soviet attempt at jamming western broadcasters used the noise from the diesel generator that was powering the jamming transmitter.
Subtle jamming is jamming during which no sound is heard on the receiving equipment. The radio does not receive incoming signals yet
everything seems superficially normal to the operator. These are often technical attacks on modern equipment, such as "squelch capture".
Thanks to FM capture effect, Frequency Modulated broadcasts may be jammed, unnoticed, by a simple unmodulated carrier
Explain the working principle of electromagnetic induction is used to make generators?
In an induction motor, a rotating magnetic field is sent sideways through the walls of a copper cylinder. The field cuts the copper, generating a current in it, and also a powerful magnetic field, and the magnetic field in the copper repels the rotating field. This 'pushes' the copper forward, making the coper try to move. If the copper cylinder is able to spin freely, it will coast along at a slightly slower speed than the rotating field, as the moving magnetic field has to keep 'cutting' the copper to create the other magnetic field. In this case the rotating cylinder is not doing any work, since no energy is being used to drive a load. It's just coasting frictionlessly.
If we place a friction load upon the motor shaft, (add a washing machine,) then the copper cylinder will slow down in the magnetic field moving through it. In this case the magnetic field is cuts the copper faster, generates more current and flux, and pushes the copper along harder, so the device becomes a motor. Energy from the rotating magnetic field sets up an opposite field in the copper cylinder, and drives it forward.
If instead we *drive* the copper cylinder forward, making it spin at a faster speed than the moving magnetic field, then the copper cylinder will push the field forward, creating a rotating field in the copper, and this generates electrical energy in the coils.
So for a 2-pole motor running at 60Hz, it becomes a motor if it spins slower than 3600RPM, and it becomes a generator if it's spun faster.
Here's a second way to visualize things: the rotating copper cylinder generates its own trapped magnetic field. This means that the copper cylinder is itself a magnet. If this magnet is allowed to spin freely, then it will turn at exactly the same rate as the magnetic field from the coils. Then if we grab the motor shaft to try to slow down the spinning "copper magnet," the poles of the magnet within the copper will lag behind the moving magnetic poles from the coils, and the coils will pull the copper strongly forward. The "copper magnet" doesn't need to slow down, but instead it will suck energy out of the coils as its gets dragged forward by the moving poles from the coils. On the other hand, if we try to spin the "copper magnet," it won't turn faster. Instead its poles will get ahead of the moving poles of the coils, and it will inject electrical energy into them, and drive the mains with this energy. In other words a moving magnet can generate a current in a nearby coil, *OR* a current in a coil can force a nearby magnet to start moving. All motors are generators and all generators are motors. It just depends on which side is driving forward and which side is being dragged along.
If induction motors and generators make your brain hurt, just remember that there's a good reason for this. They weren't invented by a bunch of engineers. Instead they sprang from the twisted mind of Nikola Tesla, who no doubt could ride along with his mental squirrel-cage rotor while seeing how the fields and currents behaved.
rip version 1 is classfull routing protocol. in classfull routing protocol is not able to carry its subnet mask whatever the ip belong from a class. it wil take its by default subnet mask.if the ip address belong to class b and the subnet mask is published as /28. in classless routing protocol this ip address would be displayed as /16 not like /28
engineering is a process or method by which we observe from our past inventions to to overpower it with a better one or make a whole new invention never before done in the history of mankind..........
