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Is a pilot licence needed for ground effect or Wing In Ground craft?
Wiki User
∙ 12y ago
no, because it is no airplane nor vehicle.
Wiki User
∙ 12y ago
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Why is foundation needed for electric transformer?
They weigh a heck of a lot. Without a foundation, they would sink into the ground and end up being useless.
What is the advantage and disadvantage of open delta bank transformer?
A disadvantage with Open Delta is there are no phase-ground voltage measurements, which is only a disadvantage if directional relaying or distance relaying is needed. Some directional and voltage based ground fault detection relays don't work without the phase to ground input. Since most industrial systems MV are high resistance grounded and ground fault protection is provided by overcurrent, there isn't a need for the phase-ground measurements.Why will the directional or distance relaying not work in this case?5. Most directional and distance relays need a voltage to ground reference to compare with the phase current nfr groudn faults. Some can use a zero sequence polarising current from CT's on the neutral of the transformer, but most need phase-neutral voltages for accurate calculation of fault direction and distance.The relay needs to see a zero sequence voltage to compare to the zero sequence current to find out which direction the current is flowing.Precise Phase-ground voltages are needed for this type of calculation, whether it is done digitally or with analog circuits or windings, coils and phae shifting circuits.The voltages provided by the Open Delta do not have enough zero sequence component.
What is the difference between 12.2 and 12.3 wire?
The 12 refers to the size of wire in AWG - American Wire Gauge. 12 gauge wire can legally carry 20 Amps, and would be used if the circuit breaker is 20 A. 14 AWG can carry 15 Amps, used on a 15 A breaker. The 2 or 3 refers to the number of ungrounded conductors in a cable (such as romex or NM). 12-2 would contain a hot (black) and a neutral (white). 12-3 would contain two hots (black and red), and a neutral (white). Additionally, these cables are available "with ground," meaning a bare ground wire is added to the cable. So a "12-2 with ground" would actually contain three conductors including the bare ground wire. A 12-2 with ground cable would be used where you needed to run a single 20 A circuit. You are allowed to share a ground and neutral when running two circuits if the circuits are on different legs (phases) in the panel. 12-3 is used for this purpose. It can also be used where you need 240 volts (between the black and red) with a neutral (and ground).
Is Chebyshev linkage an inversion of four bar linkage?
Well, yes: but that isn't very interesting. The Chebyshev linkage does have four bars, and by definition, every four bar linkage has four inversions. An 'inversion' of a linkage just means you're holding a specific bar still, or in kinematic terms, you're using that link as the 'ground link'. If a linkage has arms A, B, C, and D, the first inversion uses A as the ground link, the second inversion uses B as the ground link, the third inversion uses C as the ground link, and the fourth inversion uses D as the ground link. Inversions matter because of the 'coupler' link, which is the one opposite the ground link. Take the first inversion of A, B, C, D above: A is the ground link, so it doesn't move relative to the ground. B and D connect to A, so both of them have one end that doesn't move relative to the ground. The other ends of B and D move in circular arcs relative to the ground (they're lines of constant length, with one end fixed relative to the ground.. in other words, a compass). Link C is the coupler for this inversion, because it's connected to the moving ends of both B and D. It moves in and interesting way relative to the ground. For each inversion, a different link is the coupler, and the motion of the coupler relative to the ground tends to be VERY different from one inversion to the next. The motion of any given point on the coupler relative to ground is a sixth-order curve (meaning it start with x to the 6th power and works down from there), and people are still doing hard work on the math. The Chebyshev linkage is interesting because the center of the coupler moves in almost exactly a straight line. It wobbles a little, but the wobble is small enough that they could ignore it when making parts for steam engines that needed to move in a straight line. An interesting side effect of coupler curves being sixth-order functions is that there are three completely different linkages whose couplers will move the same way. Chebyshev was one of the people who did the math to prove that. The three linkages whose couplers move the same way are called 'cognates' of each other. The Chebyshev linkage is symmetric, so both of its cognates look the same. They're called the 'Hoekens' linkage, after the guy who did that bit of math.
How much work is needed to raise a 110kg load of bricks 12m above the ground to a building under construction?
mg= mass * gravity = 110 * 9.8 =1078 W=mg*height=1078*12m=12,963 J
What chemicals are needed for a 20x48 above ground pool?
what chemicals are needed for starting up a 20x48 intex above ground pool
Where did they get the materials they needed for the pyramids?
from the ground i guess.
Is it easier to build a house on top of the ground or under the ground?
It is easier to build on top of the ground because you would have to dig a giant hole in the ground and build from what you dug, making more work than what was needed.
What was the was needed to make a trench in war?
shovel, sandbags, the ground
What is ACC ground with regards to electronics or electricity?
It stands for accessory ground. Each load or accessory has to to have a "power" (+) wire and a ground (-) wire in order to supply the component/accessory with the needed voltage to operate.
What are to things needed in order for current to flow in a circuit?
voltage and ground
What input is needed to do the job no machine can ever decrease?
ground water
What organelle needed for photosynthesis found in ground tissue?
Chloroplasts
How many wires are needed for 110 volt?
Hot, neutral and ground.
Why is water so easily polluted?
Water is so easily polluted because of ground seepage. Water that is not needed in the ground will runoff into streams. If the ground has chemicals that would harm the stream or lake, the water is then polluted.
Why is going to high ground needed during tsunami?
The tsunami will flood the low lying areas. Going to higher ground might take you out of the areas that will be flooded.
How many grounding clamps are permitted on one ground rod?
As long as the clamp is of an approved type only one is needed per ground rod.
