This riddle is subjected to precommisioning test of an instrumentation system in hypothetical industrial plant.

The teacher was reviewing VOLTA experiments and how battery invention. One of the students asked him:

After one sever earthquake happened in the hypothetical nuclear power plant area, following observations were reported by special investigation committee that were authorized to estimate earthquake demolition in power plant.

Let's imagine the year 2107.In that time electrical power will be generated in nuclear power plants and electrical energy will be produced in big nuclear reactors.Also the electrical energy will be transmitted by superconductor cables.

Control and protection electrical circuits are one of the important portions of electrical systems designed and shown by standard symbols.

Consider two non parallel wires each carrying a current which located at one plane surface.

There are two sensitive auxiliary relay in one portion of DC control circuit (relay no.1 & no.2) separated by one semiconductor diode. Two relays (R1, R2), their two run up contacts (C1, C2) and that mentioned diode bridge (D) is located in "H" form.

Two lamps each of 60W & 100W with similar rated voltage are connected in series to a single phase & neutral ,240 V electric supply as per diagram.

According to some technical recommendation, we must  concern about metal under ground structures (e.g. pipe lines) corrosion in neighbor of power transmission lines.

dc polarity in telecom
Why we use positive conductor as a grounding and negative for switching in telecom equipment?  

What is checking method of diode kit installed in genset and purpose ot this kit for excitation system?

what are the method of checking of instrumentation installed e.g Hour meter Voltmeter etc and safities?

A three phase and three wire energy meter has installed in a medium voltage network with a lot of third harmonic current and unbalanced load (approximately %10).

I need more explanation or there is any document regarding the " Cross Current Componding"

While welding  pipeline joint,using Arc welder machine(transformer),a welder was electrocuted,in spite of taking all safety measures and using Personal protective equipment.

30 KVA DG Set not take up the load of 7.5 H.P motor through AVR. While it runs on mains.Why?

Hi, I am upgrading power transformer from 220 KVA to 400 KVA due to increase in load. I have 185mm running from Power transformer to 400 V, 3 Phase distribution system.

Dear,
Why the shape of ball type items are fixed on earth screen cables top of power transmission lines? Please Explain?

I have been asked this question below by one of my customers and I was wondering if any one can offer any advice.

Hi,
Can some one help with calculation methodology to workout the rating of the Battery for UPS.

We have two similar capacitors, one of them is charged amount Q coulomb and V volt, other is empty about any charges.

Please let me know for the same load cycle of both Lead Acid Plante Type Batteries and Ni-Cad Battery, what will be the capacity in  AH of NICad Battery  in relation (in percentage) to AH capacity of Plante Battery.

Why dc component is present in short circuit current and how they are  appering during short circuit condition?

A big industrial Co. consist a shop with a little luminance space, their company workman called it dark workshop. That building is equipped by a lot of filament lighting devices (app. 80 numbers lamp) but it hasn't enough luminance for normal activities.

one mcc panel contains feeders for 4 nos 5 hp motor,2 nos 10hp motor,3 nos 3hp motor,3 nos 1.5 hp motor.what will be the amps rating of incoming feeder?

I am looking into silicon solar cells but cannot find any sources which explain why open circuit voltage decreases with rise in temperature.
I know that voltage decreases with temperature but why?

What min. distance between different phases shall be considered in switchgears?

I am doing my Phd on Distribution Generation and i have studied the relevant standards. As far as concerning the permittable penetration level there is nothing to be found.
There is not a penetration level limit, neither an official definition of it. It is the ratio of what?

How can we estimate the inductance of rectangular strip bus bars in three phase system?

What is the influence of capacitor banks existing in short circuit level of power systems?

Is there any limitation for using of capacitor in electrical systems as power factor corrector?

Super conductor cables are supposed to be the cables having zero resistance/impedance, so that it carries infinite current capacity which will further lead to v=0 since v=ir and r is 0 therefore v=0 how  could current flow when potential difference is  zero

In a switchboard some where I have seen 3P main breaker and some where 4P breaker, what is the technicality about breaking of neutral as well. please explain technical point of view.

Is there any limitation for hazardous through current from human body?

As you know the meaning of recorded KWH by electrical energy meters is the actual amount of produced energy by power source or the actual amount of consumed energy by loads in power system.

When we use individual loads we use demand factor when we apply to a group of load we use diversity factor ....

Why strong spring usually is used in high current circuit breakers? Why required forces for operation of circuit breaker shall be increased when its rated current or short circuit capacity is increased?

When bright of our illumination lamp reduce, we note the problem in quality of transmission electrical energy.

What is local power factor compensation and its benefits?

In design of a power plant for electricity generation , what is the relationship between design ambient temperature , daily temperature and average yearly temperaure . Is there any , standard , guide or reference in this connection ?

Could some one ps help me in determining 'Mechanical Heating  vs Equivalent input power'.

What are the types of Power Distribution Cable Termination and Joints?

What is difference between voltage fluctuation and flicker and how can reduce voltage fluctuations?

If I need to connect two ac sources in parallel, what are the things I have to consider?

Can anyone send me a soft copy of the a checklist for handling over the new installation/comm'g of 11KV substation/OHL to maintenance DEPT

How many Secondary Substations (11kv/415v) are allowed in a Ring or Radial Cirucit in 11 kv Distribution System?