Electrical Engineering

Mr.Fiaz Ahmed Toru

Lattice steel tower consist of:-

1- Main members.

2- Bracing members.

3- Redundant members.

Steel Bracing is the connection between main members of lattice steel tower.

Parallel circuit.

A spike is a sudden rise in current that then goes back to normal. Usually caused by a sudden increase in voltage that could be caused by a lightening strike, for example.

What you are currently working as. Your occupation as in your job or profession.

convert mechanical energy to electrical energy

Ask your maths teacher!

R for resistor, C for capacitor.

RC circuit is a circuit built with a resistor and a capacitor.

This circuit will have a typical pulse response that looks like exponential decaying and a typical resonance frequency.

If the transformr is inside the microwave, something could've shorted causing things to draw more current, more current makes more saturation of the iron core, causing the coils to burn. If this continues, IMMEDIATLY salvage the parts, as inverter microwaves are annoying and are a PAIN to repair. Also when you take the transformer out you can get 2000v easily but with inverters you need some company's trade secret frequencies. Hope this helped! Also transformer based microwaves are not exactly made anymore so keep the parts (All of them) as they will be HISTORY. Oh and if the microwave transformer is outside and you've hooked it up to 120 (Getting 2000v out) then what you're doing on the output is drawing too much current. MOT's (Microwave oven transformers) can only handle about 2A before overheating. In that case buy a ballast inbetween the mot and the 120v input. It will limit current draw from the mot to the wall preventing overcurrent. Hope this helped!

Load factor effects the cost of generation. Higher the load factor higher will be the average load. So no. of units generated for a given period of time for the same max. demand will be more. Therefore, overall cost per unit of electrical energy decreases due to distribution of standing charges which are proportional to the max. demand and independent of units generated.

Diversity factor effects the cost of generation. More is the diversity lesser will be max. demand due to which installation capacity of plant will be less. Lesser is the installation capacity lesser will be the capital required for installation. So lesser will be generation cost. And the fixed charges in the tariff would be less.

Lt= 1/(1/L1+1/L2)

Lt= 1/(1/.02+1/.05)

Lt= 14.29 mH

The difference between 1 second and 3 seconds is 2 seconds. In terms of short-circuit withstand capacity, it can mean the difference between no damage and damage occurring to the equipment and wiring. Heat rises extremely fast in a short-circuit situation, and you want your protective device to trip before damage is done.

A short circuit causes large amounts of power to flow. If left uninterrupted for long enough, this could cause system instability, and eventual collapse of the power grid (wide area blackouts).

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A typical sump pump just sits there and does nothing until a sensor detects that sufficient water is present to turn on. If it just pumped forever it would be open loop. The fact that it also senses when the water has been pumped and stops makes it a closed loop system.

If you're referring to the water in the system, it is an open loop system, since the water is not held in the system.

The UPS should be rated in Amps per Hour. Just divide that number by the current requirements of the device connected to the UPS. Say that the UPS is rated for 10 Ampere Hours and your device draws 2 amps. You could run the device for about 5 hours.

SF6 is used to increase the dielectric strength of the gap in the circuit breaker. If the gas pressure is too low, the dielectric strength will be inadequate to break the voltage applied across the breaker contacts. This means electricity will continue to arc across the contacts when opened, causing the breaker to heat up and likely fail catastrophically (explode).

Most gas breakers have low gas alarms and trip contacts. If there is no way to bypass the breaker, a low gas trip contact can be used to open the breaker before the gas pressure gets too low to allow openning.

Synchronous motors run at synchronous speed. An induction motor that has the same number of poles must run at a sub-synchronous speed to create a second magnetic field (a field that is at a different phase angle) to generate torque.

There will be no angular displacement between the two windings and machine will not run.

AC induction motors are not always used in trains as traction engines, however they are a popular choice. AC induction motors are very simple and reliable and aside from bearing wear they have no parts that wear out. This is because the power used by the rotating parts is supplied by the magnetism like in a transformer and so there are no slipping brushes.

Most train systems actually use a DC supply, then a device called an inverter is used to convert the DC to variable frequency to drive the AC motor and control its speed. When this is done the AC induction motor is a very reliable and flexible engine and even allows energy recovery when the train is breaking.

You will have a very expensive but worthless transformer. Gold is not a ferromagnetic material, so it will not contain the magnetic flux needed to link the separate windings.

43.7667 ft•lb

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