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Electrical Wiring
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4,935 Questions
What are the values so that over all gain is 10 in instrumentation amplifier?
You need a divider that is 10 to 1. You could use 10 megohms in the feedback and 1 megohm in the bottom leg. Since you are probably talking about an operational amplifier, you need this in both legs.
Is the printing press machine ran by electricity?
The first printing presses did not use electricity.
What happens to the output voltage of a rectifier if the capacitor becomes very leaky?
A leaky capacitor will act like a load therefore decreasing the DC and increasing ripple eventually the capacitor it will self destruct because of heating probaly taking out the rectifiers as well.
How to determine the effectiveness of electric motor insulation?
there is no thermal run out and no braker down or tripping....sunlonaosman
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Motor insulation is tested with a megger. On the whole megger testing is non destructive. What happens is a DC voltage is applied to the motor or winding under test. It is an insulation test to see is the insulation has been injured in any way to cause a short circuit when normal power is applied to it. On my megger there are 3 ranges 300V, 750V, and 1000 volts. Applying the proper voltage is essential to not damaging the device you are testing. Working voltages up to 240 volts should use the 300 range. Working voltages up to 600 volts use the 750 volt range and working voltages above 600 use the 1000 volt range. As you can see if you used the 1000 volt range on a device that had a working voltage of say 24 volts you could damage the insulation just by testing it. So meggering a device is non destructive if you use the tester as its instructions tell you to.
What is an elevator shunt trip test?
An elevator shunt trip test checks the heat detector placement. It also monitors power and wiring diagram of an elevator.
What is the difference between thermosetting and thermoplastic cable?
The terms are used to categorise cable insulation according to its properties, such as its operating temperature, rather than the ingredients from which it is are made.
These terms are now used by the IEE Wiring Regulations to describe insulation formerly described, for example, as 'pvc' (a 'thermoplastic' material) or rubber ( a 'thermosetting' material).
Is the wire coil in a transformer made of an alloy?
Most transformers have coils made of pure copper. This copper is really pure, and it is not an alloy.
Certainly we know of situations where other materials are used to wind the cores of transformers. In superconcuctive matnets, the coils are alloys or composite materials that have specific superconductive properties. And don't forget the coils in the calutrons used at Oak Ridge National Laboratory to enhance uranium diring World War 2. They were made of silver that was borrowed by the ton from reserves at Fort Knox!
By and large, most transformers we encounter will be wound with pure copper wire. It might be worth noting that recycled copper is not generally used to make copper wire as it is not pure enough. Virgin copper is generally the best choice for electrical wire, and recycled copper works very well for copper pipes and copper tubing.
Lock rotor most likely cause of electric motor overheat?
If the motor's shaft will not turn (is locked) because maybe its bearings have seized - up or the thing it is driving has got damaged so it won't allow the shaft to turn, the motor will overheat in short-order.
From the Generator station, the voltage is sent to a step up transformer. Transmission at higher voltages is used to over come line loss over the miles of transmission.
Differentiate delta to delta connection of the transformer to delta to Y connection?
In delta to delta there will be no ground on both primary and secondary sides. Leave the primary side but we take care on secondary side. If there any fault occurs on the secondary then there will be unbalanced voltages between the phases results in the flow of current through the secondary windings so only we are using star on the secondary side while having neutral to prevent such a current flow.
Yes, because a thinner wire has higher resistance and dissipates more energy as heat.
What can you use astable circuits for?
Timers, oscillators, square wave generator, power supply clocks, system clocks...you name it.
What is the voltage output if the transformer is connected backwards?
It doesn't really matter which way around you use a transformer, the primary winding is ALWAYS whichever winding you connect to the supply, and the secondary winding is ALWAYS whichever winding you connect to the load. For either connection, the turns ratio will ALWAYS equal the voltage ratio for an ideal transformer (or close enough for a real transformer).
Why should you control maximum demand?
Commercial electrical customers are billed a demand charge as part of their electrical bill. The idea is that if the customer's peak instantaneous KW usage (demand) is high, the utility has to provide large enough generating and transmission capacity, which costs money.
Controlling maximum demand lowers the electric bill, saving the customer money. The act of doing so is called peak shaving, and is usually accomplished by turning off non critical loads or providing onsite co-generation to reduce utility consumption to prevent a new peak from occuring.
What is the working principle of rectenna?
rectenna is nothing but RECTifying anTENNA and this converts radio waves to electricity.the radio waves may be anything such as microwaves etc.,
by what does this rectenna works?
this is only through the mesh of diodes and dipoles
How to differentiate 110v or 220 transformers?
The way to identify any transformer is to look at the the transformers nameplate. The primary side will be designated H1 to H4. This is the primary side and the voltage will be stated as to the voltage to connect to. The secondary side will be designated X1 to X4. This is the secondary side and the voltage will be stated as to the voltage it will be transformer to.
Connecting 1 phase electric fryer to 3 phase?
Check the junction box control schematic, some equipment can be used on both systems just be re arranging the jumpers in the control box of the device.
How would you use batteries in a radio?
Usually, radios have a slot at the back or bottom where you can insert batteries (Often AA). If it does not have a slot, and isn't solar powered or anything, then contact the radio manufacturer, who will tell you how to use batteries.
If the radio has to be plugged into a socket outlet and has no slots for any batteries, then the only way you can use batteries to supply it with power is to use an electronic power inverter unit. Several types are available. The most common can use a 12 volt battery and has a socket outlet into which you can plug the radio.
What is the amount of fossil fuel that can be extracted at a profit?
Huge amounts. That is why the terrorists are indirectly financed by the US buying oil from the Middle East.
What is the difference between ATS panel and AMF Panel?
ATS (automatic transfer system panel) it will transfer load from main power to emergency without operation when the power source drop below 80% or normal voltage while
AMF (automatic main failure panel) this will substitute as main electricity source and reserve the generator if the main supply fail or down.
Can you use 20 kva transformer in a home?
Yes you could use a 20 kva transformer in a home. Stymied as to why it would be done though. You would need at least a 100 amp service to the home to energize the transformer. Primary side of the transformer would draw 83 amps at 240 volts.
If the question was to supply the home, again yes. It would be 100 amp service equipment that the transformer would feed into.
Which of the following definitions describes a circuit breaker ground fault circuit interrupter?
The first definition, by the electrical code, covers it perfectly.
