BSNL JE Best Books for preparation

September 17, 2016
BSNL JE Best Books for preparation BSNL JE Best Books for preparation Reviewed by Sikha on September 17, 2016 Rating: 5

BSNL JE admit card download here

September 17, 2016

BSNL JE (Erstwhile TTA) exam is scheduled to be conducted from 25th September. This Will be an online exam which was not specified before.  The candidates are requested to download their admit cards on or before 17 th Sepember.

BSNL Exam Admit card download click here 


As BSNL is  organizing online exam for the first time, mock tests are provided on their site.

MOCK TEST 1


MOCK TEST 2



MOCK TEST 3



All the best for all the candidates....
BSNL JE admit card download here BSNL JE admit card download here Reviewed by Sikha on September 17, 2016 Rating: 5

BSNL JE syllabus and exam pattern..

August 02, 2016
The syllabus plays a major role in the written test. The Syllabus tells about the topics which will appear in the Written Test. The BSNL Telecom Technical Assistant Exam consists of the following subjects:
  1. General Ability.
  2. Basic Engineering.
  3. Specialization.

General Ability

  • General English.
  • Verbal Reasoning.
  • Non-Verbal Reasoning.
  • Arithmetic Ability.

Basic Engineering


  • Applied Mathematics.
  • Applied Physics.
  • Basic Electricity.
  • Electronic Devices & Circuits.
  • Digital Techniques.

Specialization

The BSNL TTA Syllabus for Specialization subjects is given in the pdf file. The questions for this subject will be asked from the discipline chosen by the candidate according to their Specialized Degree. The following are the subjects to be chosen by the candidate:
  • Electrical.
  • Communication.
  • Network, Filters & Transmission Lines.
  • Instruments & Measurements.
  • Control Systems.
  • Microprocessors.
  • Computer.
the exam pattern is given below;




  • The test will be in an objective Manner having Multiple Choice Questions.
  • The Exam will be conducted for a duration of 3 hours.
  • The BNL TTA Test will be conducted for a total of 200 Marks with 200 Objective type questions.
S.NoExamPaperSubjectQuestionsMarksDuration
1Written TestIGeneral Ability Test20203 Hours
IIBasic Engineering9090
IIISpecialization9090
Total200200

BSNL JE syllabus and exam pattern.. BSNL JE syllabus and exam pattern.. Reviewed by Sikha on August 02, 2016 Rating: 5

BSNL JE recruitment 2016

August 02, 2016
BSNL Recruitment 2016 – Apply Online for 2700 Junior Engineer Posts: Bharat Sanchar Nigam Limited (BSNL) has issued a notification for the recruitment of 2700 Junior Engineer vacancies on temporary or permanent basis. Eligible candidates can apply online from 10-07-2016 to 10-08-2016 & attend for online test on 25-09-2016. Other details like age limit, educational qualification, selection process, application fee& how to apply are given below…
BSNL Vacancy Details:
Total No.of Posts: 2700
Name of the Post: Junior Engineer
1. Andaman & Nicobar: 12 Posts
2. Andhra Pradesh: 76 Posts
3. Assam: 116 Posts
4. Bihar: 34 Posts
5. Chennai Telephones: 80 Posts
6. Chhattisgarh: 17 Posts
7. Gujarat: 206 Posts
8. Haryana: 160 Posts
9. Himachal Pradesh: 73 Posts
10. Jammu & Kashmir: 79 Posts
11. Jharkhand: 19 Posts
12. Karnataka: 120 Posts
13. Kerala: 100 Posts
14. Kolkata Telephones: 80 Posts
15. Madhya Pradesh: 78 Posts
16. Maharashtra: 224 Posts
17. North East – I: 132 Posts
18. North East – II: 34 Posts
19. NTR: 15 Posts
20. Odisha: 43 Posts
21. Punjab: 400 Posts
22. Rajasthan: 100 Posts
23. Tamil Nadu: 198 Posts
24. Uttar Pradesh (East): 80 Posts
25. Uttar Pradesh (West): 80 Posts
26. Uttaranchal: 29 Posts
27. West Bengal: 115 Posts
Age Limit: Candidates age should not be below 18-30 years as on the last date of receipt of online application.Upper age relaxation is 05 years for SC/ ST & BSNL employees, 03 for OBC, 15 for SC/ ST-PWD, 13 for OBC-PWD, 10 for OC-PWD & for Ex-servicemen as per Central Govt Rules.
Educational Qualification: Candidates should possess three years Engineering diploma/ B.Tech/ B.E in Telecommunications/ Electronic/ Electrical/ Radio/ Computer/ Instrumentation/ Information Technology from a Central Govt/ State Govt. recognized Institution.
Selection Process: Candidates will be selected based on Online Test.
Application Fee: Candidates should pay Rs. 1000/- for OC/ OBC candidates (Rs.500/- for SC/ ST candidates) through online mode i.e Internet Banking, Credit Card, Debit Card only.
How to Apply: Eligible candidates may apply online through the website www.externalbsnlexam.com from 10-07-2016 to 10-08-2016 & attend for online test on 25-09-2016.
Instructions to Apply Online:
1. Before applying online candidates should have valid e-mail ID & Contact No.
2. Log on to www.externalbsnlexam.com
3. Select the desired post & Click on “Apply Online”.
4. Fill the details carefully & submit the form.
5. Take a print out of online application for future use.
Important Dates:
Starting Date for Online Application: 10-07-2016.
Last Date for Online Application: 10-08-2016.
Date of Online Test: 25-09-2016.
For more details like scale of pay & other information click on the link given below….





BSNL JE recruitment 2016 BSNL JE recruitment 2016 Reviewed by Sikha on August 02, 2016 Rating: 5

How do an induction cooker work?

June 19, 2016


An induction cooktop  is simply an electromagnet you can cook with. Inside the glass cooktop, there's an electronically controlled coil of metal. When you turn on the power, you make a current flow through the coil and it produces a magnetic field all around it and (most importantly) directly above it.  it generates a constantly changing magnetic field. It does not generate heat directly. You can put your hand on top of it and you won't feel a thing. (Warning: Don't ever put your hand on a cooktop that has recently been used for cooking because it may have become dangerously hot from the cooking pan that's been standing on top of it.)

 Image result for how induction cooker works             Image result for how induction cooker works

When you stand a suitable cooking pan on top of an induction cooktop that's powered up, the magnetic field produced by the cooktop penetrates the metal of the pan. So we have a fluctuating magnetic field moving around inside a piece of metal (the base and sides of the pan)—and that makes an electric current flow through the pan too (that's all that induction means). Now this is not quite the same as the electric current that flows through a wire, carrying electrical energy in a straight line from (say) a battery to a flashlight bulb. It's a kind of whirling, swirling electric current with lots of energy but nowhere to go; we call it an eddy current. As it swirls around inside the metal's crystalline structure, it dissipates its energy. So the metal pan gets hot and heats up whatever food is inside it, first by conduction (it passes its heat energy directly to the food) but also by convection (liquid food rises and falls in the pan carrying heat with it). 
How do an induction cooker work? How do an induction cooker work? Reviewed by Sikha on June 19, 2016 Rating: 5

Power measurement in a transmission line

June 19, 2016

In a transmission line, power is measured by means of a voltmeter between the conductors,and an ammeter in series with one of the conductors (Fig.). Then the power, P (in watts) is equal to the product of the voltage E (in volts) and the current I(in amperes). This technique can be used in any transmission line, be it for 60-Hz utility service, or in a radio transmitting station. But is this indication of power the same as the power actually dissipated by the load at the end of the line? Not necessarily.




Recall, from the discussion of impedance, that any transmission line has a characteristic impedance. This value, Zo, depends on the size of the line conductors, the spacing between the conductors, and the type of dielectric material that separates the conductors. For a coaxial cable, Zo can be anywhere from about 50 to 150 Ω. For a parallel-wire line, it can range from about 75 Ω to 600 Ω.If the load is a pure resistance R containing no reactance, and if R _ Zo, then thepower indicated by the voltmeter/ammeter scheme will be the same as the true power
dissipated by the load. The voltmeter and ammeter must be placed at the load end of the transmission line.
If the load is a pure resistance R, and R < Zo or R > Zo, then the voltmeter and ammeter will not give an indication of the true power. Also, if there is any reactance in the load, the voltmeter/ammeter method will not be accurate.
The physics of this is rather sophisticated, and a thorough treatment of it is beyond
the scope of this course. But you should remember that it is always desirable to have the load impedance be a pure resistance, a complex value of R _ j0, where R _ Zo. Small discrepancies, in the form of a slightly larger or smaller resistance, or a small reactance, can sometimes be tolerated. But in very-high-frequency (VHF), ultra-high-frequency (UHF) and microwave radio transmitting systems, even a small impedance mismatch between the load and the line can cause excessive power losses in the line.

An impedance mismatch can usually be corrected by means of matching transformersand/or reactances that cancel out any load reactance.
Power measurement in a transmission line Power measurement in a transmission line Reviewed by Sikha on June 19, 2016 Rating: 5

Primary and secondary cells

June 19, 2016


Primary and secondary cells
Some electrical cells, once their potential (chemical) energy has all been changed to electricity and used up, must be thrown away. They are no good anymore. These arecalled primary cells.


Other kinds of cells, like the lead-and-acid unit depicted above, can get their chemical
energy back again. Such a cell is a secondary cell.

Primary cells include the ones you usually put in a flashlight, in a transistor radio,
and in various other consumer devices. They use dry electrolyte pastes along with
metal electrodes. They go by names such as dry cell, zinc-carbon cell, alkaline cell,
and others. Go into a department store and find the panel of batteries, and you’ll see
various sizes and types of primary cells, such as AAA batteries, D batteries, camera batteries, and watch batteries. You should know by now that these things are cells, not truebatteries. This is a good example of a misnomer that has gotten so widespread that
store clerks might look at you funny if you ask for a couple of cells. You’ll also see real
batteries, such as the little 9-V transistor batteries and the large 6-V lantern batteries.
Secondary cells can also be found increasingly in consumer stores. Nickel-cadmium
(Ni-Cd or NICAD) cells are probably the most common. They’re available in
some of the same sizes as nonrechargeable dry cells. The most common sizes are AA, C,and D. These cost several times as much as ordinary dry cells, and a charging unit also costs a few dollars. But if you take care of them, these rechargeable cells can be usedhundreds of times and will pay for themselves several times over if you use a lot of “batteries” in your everyday life.
The battery in your car is made from secondary cells connected in series. These cells
recharge from the alternator or from an outside charging unit. This battery has cells likethe one in Fig.



. It is extremely dangerous to short-circuit the terminals of such a battery,
because the acid (sulfuric acid) can “boil” out and burn your skin and eyes.
An important note is worth making here: Never short-circuit any cell or battery, because

it might burst or explode.
Lead acid battery
Primary and secondary cells Primary and secondary cells Reviewed by Sikha on June 19, 2016 Rating: 5

Cells and batteries

June 19, 2016

ONE OF THE MOST COMMON AND MOST VERSATILE SOURCES OF DC IS THE CELL.
The term cell means self-contained compartment, and it can refer to any of various different things in (and out of) science. In electricity and electronics, a cell is a unit source of dc energy. There are dozens of different types of electrical cells.
When two or more cells are connected in series, the result is known as a battery.
Kinetic and potential energy .
Energy can exist in either of two main forms. Kinetic energy is the kind you probably think of right away when you imagine energy. A person running, a car moving down a freeway, a speeding aircraft, a chamber of superheated gas—all these things are visible manifestations of kinetic energy, or energy in action. The dissipation of electrical power, over time, is a form of kinetic energy too.
Potential energy is not as vividly apparent. When you raise a block of concrete into
the air, you are creating potential energy. You remember the units called foot pounds, the best way to measure such energy, from school physics classes. If you raise a one-pound weight a foot, it gains one foot pound of potential energy. If you raise it 100 feet, it gains 100 foot pounds. If you raise a 100-pound weight 100 feet, it will gain 100 × 100, or 10,000, foot pounds of potential energy. This energy becomes spectacularly evident if you happen to drop a 100-pound weight from a tenth-story window.
Electrochemical energy
In electricity, one important form of potential energy exists in the atoms and molecules of some chemicals under special conditions. Early in the history of electrical science, laboratory physicists found that when metals came into contact with certain chemical solutions, voltages appeared between the pieces of metal. These were the first electrochemical cells.

   A piece of lead and a piece of lead dioxide immersed in an acid solution (Fig.)will show a persistent voltage. This can be detected by connecting a galvanometer between the pieces of metal. A resistor of about 1,000 ohms should always be used in series with the galvanometer in experiments of this kind; connecting the galvanometer directly will cause too much current to flow, possibly damaging the galvanometer and causing the acid to “boil.”

The chemicals and the metal have an inherent ability to produce a constant exchange of charge carriers. If the galvanometer and resistor are left hooked up between the two pieces of metal for a long time, the current will gradually decrease, and the electrodes will become coated. The acid will change, also. The chemical energy, a form of potential energy in the acid, will run out. All of the potential energy in the acid will have been turned into kinetic electrical energy as current in the wire and galvanometer. In turn, this current will have heated the resistor (another form of kinetic energy), and escaped into the air and into space.

Cells and batteries Cells and batteries Reviewed by Sikha on June 19, 2016 Rating: 5

Bar-graph meters

June 19, 2016

A cheap, simple kind of meter can be made using a string of light-emitting diodes (LEDs) or a liquid-crystal display (LCD) along with a digital scale, to indicate approximate levels of current, voltage or power. This type of meter has no moving parts to break, just like a digital meter. But it also offers the relative-reading feeling you get with an analog meter.
Figure below is an example of a bar-graph meter that is used to show the power output, in kilowatts, for a radio transmitter. It indicates 0.8 kW or 800 watts, approximately.




The chief disadvantage of the bar-graph meter is that it isn’t very accurate. For this reason it is not generally used in laboratory testing. The LED or LCD devices sometimes also flicker when the level is “between” two values given by the bars. This can be annoying to some people.

Bar-graph meters Bar-graph meters Reviewed by Sikha on June 19, 2016 Rating: 5

Pen recorders

June 19, 2016




A meter movement can be equipped with a marking device, usually a pen, to keep a graphic record of the level of some quantity with respect to time. Such a device is called a pen recorder. The paper, with a calibrated scale, is taped to a rotating drum. The drum, driven by a clock motor, turns at a slow rate, such as one revolution per hour or one revolution in 24 hours. A simplified drawing of a pen recorder is shown in Fig.



A device of this kind, along with a wattmeter, might be employed to get a reading
of the power consumed by your household at various times during the day. In this way you might tell when you use the most power, and at what particular times you might be using too much.

Pen recorders Pen recorders Reviewed by Sikha on June 19, 2016 Rating: 5
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