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Answered on 22/10/2018 Exam Coaching/Engineering Entrance Coaching/GATE Coaching

Achievers Point

There is no restriction for giving GATE exam, you can give as many times as you want and also there is no age restriction. It is conducted once in a year, first and second week of month February and its scores are valid for 3 years from the date of the GATE result. read more

There is no restriction for giving GATE exam, you can give as many times as you want and also there is no age restriction. It is conducted once in a year, first and second week of month February and its scores are valid for 3 years from the date of the GATE result.

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Answered on 19/09/2018 Exam Coaching/Engineering Entrance Coaching/GATE Coaching

Where are GATE oaching centres in Nellore?

 

Sachin Bonde

Tutor

Not sure but you can either approach in hyderabad for ACE engineering academy for good casses. If you are electronics/Electrical i provide online coaching and guidance with nice notes. thanks
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Lesson Posted on 15/09/2018 Exam Coaching/Engineering Entrance Coaching/GATE Coaching/Electrical Tuition/BTech Tuition/BTech Electrical & Electronics

lesson on Reactive power for Gate students

Surendar Reddy

I GOT gate AIR 179 rank in Electrical and electronics engineering. I have complete Knowledge of all...

1. What is reactive power? a) Reactive power is useful for machines to establish their working flux example: induction motors require reactive power to establish a rotating magnetic field(working flux). 2) What are sources of reactive power? a) 1. Synchronous alternator working with Lagging power... read more

1. What is reactive power?

a) Reactive power is useful for machines to establish their working flux

example: induction motors require reactive power to establish a rotating magnetic field(working flux).

2) What are sources of reactive power?

a) 1. Synchronous alternator working with Lagging power factor or overexcited synchronous alternator

2. Synchronous motor working with leading power factor or overexcited synchronous motor

3. Capacitor banks

4. Underground cables

3) What are sinks of reactive power?

1.Induction motors/generators

2. Inductors

3. overhead lines

4. Synchronous alternator working with Leading power or underexcited synchronous alternator

5. Synchronous motor working with lagging power factor or under excited synchronous motor

 

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Lesson Posted on 06/09/2018 CBSE/Class 11/Science/Chemistry CBSE/Class 11/Science/Physics Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching +1 Exam Coaching/Engineering Entrance Coaching/GATE Coaching less

All about entropy

Subrat Majhi

Fine at science 10th - 10cgpa 12th 90.60% Will make you aware of how science in linked with your...

Entropy, the measure of a system s thermal energy per unit temperaturethat is unavailable for doing useful work. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system. The concept of entropy provides... read more

Entropy, the measure of a system’s thermal energy per unit temperaturethat is unavailable for doing useful work. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system. The concept of entropy provides deep insight into the direction of spontaneous change for many everyday phenomena. Its introduction by the German physicist Rudolf Clausius in 1850 is a highlight of 19th-century physics.

The idea of entropy provides a mathematical way to encode the intuitive notion of which processes are impossible, even though they would not violate the fundamental law of conservation of energy. For example, a block of ice placed on a hot stove surely melts, while the stove grows cooler. Such a process is called irreversible because no slight change will cause the melted water to turn back into ice while the stove grows hotter. In contrast, a block of ice placed in an ice-water bath will either thaw a little more or freeze a little more, depending on whether a small amount of heat is added to or subtracted from the system. Such a process is reversible because only an infinitesimal amount of heat is needed to change its direction from progressive freezing to progressive thawing. Similarly, compressed gasconfined in a cylinder could either expand freely into the atmosphere if a valve were opened (an irreversible process), or it could do useful work by pushing a moveable piston against the force needed to confine the gas. The latter process is reversible because only a slight increase in the restraining force could reverse the direction of the process from expansion to compression. For reversible processes the system is in equilibrium with its environment, while for irreversible processes it is not.

To provide a quantitative measure for the direction of spontaneous change, Clausius introduced the concept of entropy as a precise way of expressing the second law of thermodynamics. The Clausius form of the second law states that spontaneous change for an irreversible process in an isolated system (that is, one that does not exchange heat or work with its surroundings) always proceeds in the direction of increasing entropy. For example, the block of ice and the stove constitute two parts of an isolated system for which total entropy increases as the ice melts.

By the Clausius definition, if an amount of heat Q flows into a large heat reservoir at temperature Tabove absolute zero, then the entropy increase is ?S = Q/T. This equation effectively gives an alternate definition of temperature that agrees with the usual definition. Assume that there are two heat reservoirs R1 and R2 at temperatures T1 and T2 (such as the stove and the block of ice). If an amount of heat Qflows from R1 to R2, then the net entropy change for the two reservoirs isentropy equationwhich is positive provided that T1 > T2. Thus, the observation that heat never flows spontaneously from cold to hot is equivalent to requiring the net entropy change to be positive for a spontaneous flow of heat. If T1 = T2, then the reservoirs are in equilibrium, no heat flows, and ?S = 0.

 

The condition ?S ? 0 determines the maximum possible efficiency of heat engines—that is, systems such as gasoline or steam engines that can do work in a cyclic fashion. Suppose a heat engine absorbs heat Q1 from R1and exhausts heat Q2 to R2 for each complete cycle. By conservation of energy, the work done per cycle is W= Q1 – Q2, and the net entropy change isentropy equationTo make W as large as possible, Q2should be as small as possible relative to Q1. However, Q2 cannot be zero, because this would make ?Snegative and so violate the second law. The smallest possible value of Q2corresponds to the condition ?S = 0, yieldingentropy equationas the fundamental equation limiting the efficiency of all heat engines. A process for which ?S = 0 is reversible because an infinitesimal change would be sufficient to make the heat engine run backward as a refrigerator.

 

The same reasoning can also determine the entropy change for the working substance in the heat engine, such as a gas in a cylinder with a movable piston. If the gas absorbs an incremental amount of heat dQ from a heat reservoir at temperature T and expands reversibly against the maximum possible restraining pressure P, then it does the maximum work dW = PdV, where dV is the change in volume. The internal energy of the gas might also change by an amount dU as it expands. Then by conservation of energy, dQ = dU + PdV. Because the net entropy change for the system plus reservoir is zero when maximum work is done and the entropy of the reservoir decreases by an amount dSreservoir = ?dQ/T, this must be counterbalanced by an entropy increase ofentropy equationfor the working gas so that dSsystem + dSreservoir = 0. For any real process, less than the maximum work would be done (because of friction, for example), and so the actual amount of heat dQ? absorbed from the heat reservoir would be less than the maximum amount dQ. For example, the gas could be allowed to expand freely into a vacuum and do no work at all. Therefore, it can be stated thatentropy equationwith dQ? = dQ in the case of maximum work corresponding to a reversible process.

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Answered on 24/07/2018 CBSE/Class 11/Science/Physics Exam Coaching/Engineering Entrance Coaching/GATE Coaching/Mechanical

Amit Kumar

Physics Teacher

This is not principle of conservation of energy but it is principle of conservation of momentum.
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Lesson Posted on 24/07/2018 Life Coaching Exam Coaching/Engineering Entrance Coaching/GATE Coaching/Engineering Sciences

Fighting your Fear

Prof. Sneh Pragya

Former Assistant Professor in Katihar Engineering College, Katihar. I Teach Mechanical Engineering subjects/GATE...

Hello buddies. I am Prof. Sneh Pragya. I want to talk about the most major issue we face in life. "FEAR" this word has done lot of holes n our personality. we fear what if i fall. I will broke my leg. what if I didn't get my favourite food. I wont like it what if I got less marks than my friend.... read more

Hello buddies.

I am Prof. Sneh Pragya. I want to talk about the most major issue we face in life. "FEAR" this word has done lot of holes n our personality.

we fear

what if i fall. I will broke my leg.

what if I didn't get my favourite food. I wont like it

what if I got less marks than my friend. Me and my parents will be ashamed.

what  will my relatives say. 

what will my family say.. lot more

 

it starts from our childhood. When we let it win from our other emotion called happiness; it grows.

 

"This dog will bite me" RUN... by running we let fear win.

FEAR says "don't go to that sweet little monster, it will bite u"  everytime we don't pet a Dog because fear told us not to do so. FEAR wins.

Instead, what we could have done, we could let ourselves go to the DOG with small steps and let it BITE us if it wants to bite.

 

Still, there are two chances: the dog will bite us or it won't.

In the worst case, the dog will bite. But after that what !!!

Some injections and no school for long ... :) isn't it good.

 

See every time we cancel out our fear with the courage we get treats. We become BRAVE.

Same thing happnes everytime.

If we let our fear win everyday gradually it will become a bigger FEAR monster and that big monster is going to control us.

 

It will control us at every moment of our life.

 

It wont let u enjoy the new food. 

It won't let u do daring adventurous things.

It wont let you concentrate in what is important.

It wont let you enjoy ur hobbies because u may fail if u dont pay more tme to study.

It wont let u make new random friends. who could be there for you for life.

 

FEAR sets limits arround us. It makes us frightend of unknown things and we live in box call FEAR BOX.

 

Silly things like our own thaoughts can creat disasters. 

It may sound obsurd that what is that, but its true.

We mostly fear from our own thoughts. 

What kinda person does tht?

Answer is "everyone who let stupid fear win in small stupid things. "

 

Now their might be doubts like what if our fear saves us from danger?

again the Answer is FEAR dosnt save us. its our wisdome who does. 

 

we need to be Wise and full of enthusiasm.

we need to do actually what we like to do. one day we can achieve perfection.

we need to be what we want to be. it will make us great.

we must believe our own instincts.

we need to be with whome we want to be there might be the chances of true friend for eternity. 

So promise one thing to yourself that "" I am not going to fear from my own thoughts.""

I will follow my happiness step by step.

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Lesson Posted on 23/07/2018 CBSE/Class 10 CBSE/Class 11/Science/Biology CBSE/Class 10/Science/Unit II: World of Living/Life Processes +8 CBSE/Class 9/Science CBSE/Class 12/Science/Biology Tuition/BTech Tuition/Genetic Engineering Tuition/BA Tuition/Fundamentals of Genetic Engineering Tuition/BSc Tuition/Genetics & Genomics Tuition/BSc Tuition/Human Genetics Exam Coaching/Engineering Entrance Coaching/GATE Coaching/Biotechnology Tuition/BA Tuition/Bio-Chemistry less

Basics of Nucleic Acid (Part 1)

Ankita Das

I am an experienced, qualified tutor with over 5 years of experience in teaching Science subjects (physics...

There are 4 crucial components in an organism. 1) Carbohydrate 2) Proteins 3) Fat 4) Nucleic Acids In this lesson, the discussion will be on nucleic acids. There are mainly two types of nucleic acids. a) DNA ( de-oxy-ribonuceic acid) b) RNA (ribonucleic acid) DNA is a macromolecule which... read more

There are 4 crucial components in an organism.

1) Carbohydrate

2) Proteins

3) Fat

4) Nucleic Acids

 

In this lesson, the discussion will be on nucleic acids.

There are mainly two types of nucleic acids.

a) DNA ( de-oxy-ribonuceic acid)

b) RNA (ribonucleic acid)

 

DNA is a macromolecule which is the career of all the genetic information. DNA itself carries out all the main functions of the body in the molecular level.

 

Structure of DNA:

DNA basically is a polymer. It is a polymer of nucleotides. The nucleotide consists of 3 components. 

•Nitrogen Base

• De oxy Ribose sugar (has 5 carbon atoms)

•Inorganic Phosphate

 

There are 4 types of nitrogen base in DNA.

•Adenine (A)

•Guanine (G)

•Thymine (T)

•Cytosine (C)

 

They are categorised into two sections. First one is Purine which consists of Adenine and Guanine. Another one is Pyrimidine which consists of Thymine and Cytosine. 

 

DNA is a double-stranded helix. Each strand has the nucletonuc pairs. The pairing is made by bonding between the nitrogen bases between each stand.

Adenine always makes a pair with Thymine with double hydrogen bonds. Guanine makes a triple bond with Cytosine.

 

What is nucleotide?

= Nucleotide is a monomer consists of a nitrogen base, a de-oxy-ribose sugar and an inorganic phosphate residue. It is the basic constituent of a DNA molecule.

 

What is nucleoside?

= Nucleoside consists of a nitrogen base, a de-oxy-ribose sugar, but lacking a phosphate residue.

 The bond between the nitrogen base and the sugar is called the glycosidic bond.

DNA has a helical structure. The two strands are in helix form but in a parallel manner. So there are loops in the helix (see figure below). Usually, DNA has a right-handed helix. There are 10 base pairs in a single loop.

The diameter of a DNA helix is 20 Å

The distance between two corresponding nucleotide pairs is 3.4 Å

So the length of a loop is 3.4x10= 34 Å.Structure of DNA

 

 

 

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Lesson Posted on 22/07/2018 Biomolecules CBSE/Class 11/Science/Biology Exam Coaching/Engineering Entrance Coaching/GATE Coaching/Biotechnology +2 CBSE/Class 9/Science/Unit 1-Matter - Its Nature & Behaviour/Atoms and Molecules CBSE/Class 10/Science/Unit II: World of Living/Life Processes less

Basics of Nucleic Acid (part 2)

Ankita Das

I am an experienced, qualified tutor with over 5 years of experience in teaching Science subjects (physics...

Now let's move on to RNA i.e Ribonucleic Acid. RNA is also macro molecule made up with polymer of nucleotides. One of the major difference between DNA and RNA is that unlike DNA, RNA is single stranded. It doest not hold the concept of "base pairing". It is also helical. Like DNA, RNA also has nucleotides... read more

Now let's move on to RNA i.e Ribonucleic Acid.

RNA is also macro molecule made up with polymer of nucleotides. 

One of the major difference between DNA and RNA is that unlike DNA, RNA is single stranded. It doest not hold the concept of "base pairing". It is also helical.

Like DNA, RNA also has nucleotides which are made up of one nitrogen base, one ribose sugar, and a inorganic phosphate residue.

Here is also same classification of nitrogen base catagory,i.e Purine and Pyrimidine.

As purine, RNA has adenine and Guanine.

But as pyrimidine, RNA has Uracil and Cytosine. So here is a new base named uracil. RNA does not have thymine.

 

Depending on the structure and function , RNA can be classified into 3 major catagory--

• messenger RNA (mRNA)

• ribosomal RNA (rRNA)

• transfer RNA (tRNA)

 

mRNA holds a crucial function in life processes. It has the particular code to make a particular protein.

 

So the major differences between DNA and RNA are--

 

DNA RNA
Double stranded  single standed
It has de-oxy-ribose sugar 
it has ribose sugar
It has thymine as pyrimidine base it has Uracil as pyrimidine base
It is the genetic material of most of the organisms in the world. Few bacteria and viruses has RNA as genetic material.
It can be catagorized into B-DNA, A-DNA, Z-DNA it can be catagorized into mRNA, rRNA, tRNA

 

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Answered on 10/06/2018 Exam Coaching/Engineering Entrance Coaching/GATE Coaching/Mechanical

I'm doing some part-time job, so is there any way to get GATE classes with irregularities in time, I... read more
I'm doing some part-time job, so is there any way to get GATE classes with irregularities in time, I mean weekly 3-4 days I'll have work, don't know which day it'll b. So let me know is there anyone available to teach me with these facilities. If the classes are available at early morning also let then me know. read less

Sjm

We have a virtual class room, those who have a laptop/Smart phone/desktop they can connect with us for technical courses to get knowledge to take up any Entrance exams for technical education. We will give training for CET/Gate/JEE etc for further details visit www.iseglobalsolutions.com read more

We have a virtual class room, those who have a laptop/Smart phone/desktop they can connect with us for technical courses to get knowledge to take up any Entrance exams for technical education. We will give training for CET/Gate/JEE etc

for further details visit 

www.iseglobalsolutions.com

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Answered on 21/09/2018 Exam Coaching/Engineering Entrance Coaching/GATE Coaching

Shruti Kumari

Mathematics Faculty with 5 years of experience

Not, Commonly IIT Syllabus is Complex and Depth
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