Vanadium dioxide

Metal that conducts electricity but not heat found:

Electrons in vanadium dioxide can conduct electricity without conducting heat.

Which may pave the way for systems that convert waste heat from engines and appliances into electric power.

It could lead to a wide range of applications, such as thermoelectric systems that convert waste heat from engines and appliances into electricity.

Wiedemann-Franz Law: For most metals, the relationship between electrical and thermal conductivity is governed by this law:

The law states that good conductors of electricity are also good conductors of heat. But that is not the case for metallic vanadium dioxide.

Vanadium dioxide is already noted for its unusual ability to switch from an insulator to a metal when it reaches 67 degrees Celsius.

Not done yet :

So ESE 2017-Pre ( obviously a new word has been introduced by killer institute UPSE ) is over.

Some of you have done well at this stage and most of you have failed to your expectations ( same could be concluded for SSC-JE ☺). But the under covered fact is, that none of you know the final result, if you have done well don't be over confident bcz enemy power is still unknown 😉, so just continue your hard work✍ to clear next two hurdle 👍.
Now coming to mass people who are destined to overcome the mistake they have committed in this exam.
Which is possible only if you ( if you are one among them ) have trust in these Power Points:

1- There is nothing like permanent in this universe ( will fight next time 💪 ).
2- There is definitely a better one ( Har Sher ka Sava Sher hota hi hai🐯 ).
3- It was not the end of world ( Duniya rukati nai bhai shahb )
4- There are plenty of fish in the water, if not this one, choose other one ( be wise ).
5- Accept your fault and learn from them. ( Imandaar bano dost 😉 )
6- Reorder yourself.
7- Have patient & consistency ☺.
8- Have confidence in yourself.
9- Be single goal oriented ( most important ☺ ).
10- God have plan for every one and is with everyone 👍.

Objective question practice session :✍✍

So, you wanted it, we planned it and soon we are going to start it ☺.

Definitely practice and consistency are the two key to be successful in any field💪. keeping this in mind and observing the upcoming exams we have started to compile the best questions (subject wise) and it is being scheduled to be published as soon as possible.

On our side we will try our best to make  perfect sets of questions and from your side we are expecting the same level of hard work. Here we would like to tell that-

1- Don't try to substitute it with your books, it's just a supplementary material.
2- Go thoroughly through your books.
3- Solve solved and unsolved questions as much as possible.
4- Then try to solve questions posted on Linkupdots.
5- On day one you will get question set and on next day solution.

Linkupdots questions will be most likely to be the expected one in SSC-JE & SES-AE/JE exams and will help you to brush up your basic concepts.
So get ready to test your self 👍.

UNFCCC

United Nations Framework Convention on Climate Change (UNFCCC) created because of the Rio Summit/ Earth Summit of 1992.
It is an international treaty for reducing greenhouse gas emissions.
Now nearly every country on Earth is a party to the UNFCCC with few major exception like USA, Canada.

*So what was Rio Summit/ Earth Summit -
It was a United nations summit, held in Rio de Janeiro (Brazil) in 1992.
It led to creation of United Nations Framework Convention on Climate Change (UNFCCC)

The nations, who’ve signed UNFCCC convention, meet every year to discuss climate change strategy.
These meetings are called Conference of the Parties (COP)

Some notable COP :
COP 1 - held in Berlin ( Berlin Roadmap ).
COP 3 - held in Kyoto, Japan ( Kyoto Protocol ).
COP 7 - Marrakech, Morocco ( Marrakech accord ).
COP 8 - Delhi.
COP 13 - Bali, Indonesia ( Bali action plan ).
              -  Adopted REDD+
COP 17 - Durban, S.Africa in 2011.
COP 18 - Doha, Qatar in 2012.
              - Extended Kyoto Protocol for phase 2.
COP 19 - Warsaw, Poland
              - Warsaw international mechanism on loss and damage.
COP 21 - Paris
               - Paris Agreement.

RLV-TD

Reusable Launch Vehicle-Technology Demonstrator (RLV-TD)

India’s first winged body aerospace vehicle, called the Reusable Launch Vehicle-Technology Demonstrator (RLV-TD) was successfully launched from ISRO’s first launch

pad in Sriharikota 80 km off Chennai on the east coast at 7.00 am on Monday. The RLV-TD shuttle shaped like an aircraft was launched aboard the HS9 a seven-meter rocket with a booster, weighing 17 tons with nine tons of solid propellants. The rocket and shuttle made a successful flight of 91.1seconds and the burnout of HS9 followed.

The development of reusable launch vehicle has opened new gateways in conducting space experiments using conventional rockets. One major significance of reusable vehicle is its cost effectiveness. The new vehicle has the potential to cut down the actual cost of launching the rocket by ten times.

With the launch of reusable launch vehicle India has demonstrated the world that what India is capable of. Even though the launch vehicle is just a prototype, there is lot to be done in developing a fully fledged space shuttle.

In this flight, critical technologies such as autonomous navigation, guidance & control, reusable thermal protection system and re-entry mission management have been successfully validated.

With this successful mission India has joined the elite club of space-faring nations. The other countries are the USA, Russia and Japan, that developed and used RLVs for their space missions. This mission has enabled ISRO to successfully collect data and validate such critical technologies and systems as hypersonic speed, autonomous navigation, guidance and control, reusable thermal protection system, powered cruise flight using air-breathing propulsion and re-entry mission management. According to experts, the reusable vehicle technology will reduce the costs of launches in the future by 80% percent.

ESE-17 - Sample Paper

Model questions in General Studies & Engineering Aptitude for Engg. services examination - 2017

http://www.upsc.gov.in/exams/Rev_Syllabus/ese/2016/Model_Q_Paper_ESE_2017_GS_Enggg.pdf

Differences between Bernoulli and S.F.E.E. ?

Well, Bernoulli's equation is a very simplified form of the actual energy equation derived by using control volumes around the fluid flow considering all possible variations including time and space. 

1) Bernoulli's equation doesn't account for any other form of work or energy other than potential energy, kinetic energy and pressure energy. For example, the fluid can flow through a pump doing work on it or a furnace heating a column of air. In these cases, you can't use the simple Bernoulli equation, as points before the area where work is being done on the fluid  and points after it have different Bernoulli's constants.

2) Moreover, Bernoulli's equation between two points is valid along a streamline only. This is because different streamlines have different Bernoulli's constant (although, this is rare and is not true when the flow is irrotational) 

3) For energy equation to be valid, the flow field need not be incompressible or non-viscous as is needed for Bernoulli's equation (unless you are using compressible Bernoulli flow equation and also adding the friction head to take care of viscous effects at the wall)

4) Further, the Bernoulli equation is generally used for steady and laminar flow. Energy equation written in its full glory takes care of variations in viscosity, density, pressure and velocity variation with respect to time and space. Written along with Navier Stokes equation, even turbulence can be accounted for.