4 electrical & electronics students

IES Pattern The Examination of IES shall be followed according to the following plan: Part I-   The written examination will comprise two sections-Section I consisting only of objective types of questions and Section II of conventional papers. Both Sections will cover the entire syllabus of the relevant engineering disciplines viz. Civil Engineering, Mechanical Engineering, Electrical Engineering and Electronics & Telecommunication Engineering. The standard and syllabi prescribed for these papers are given in Schedule to the Appendix. The details of the written examination i.e. subject, duration and maximum marks allotted to each subject are given in para 2 below. Part II-  Personality test carrying a maximum of 200 marks of such of the candidates who qualify on the basis of the written examination. -ELECTRICAL ENGINEERING I—Objective Papers General Ability Test (Part A: General English) (Part B: General Studies) 2 hrs 200 Electrical Engineering Paper I...

About IES   Indian Engineering Services Examination , UPSC (Union Public Service commission) conducts Engineering Services Examination for recruitment in various engineering services/posts in various Government Departments. The recruitment is done for three categories: Civil Engineering, Mechanical Engineering, Electrical Engineering and Electronics & Telecommunication Engineering. These jobs are considered to be highly reputed therefore a large number of candidates appear for CMSE exam but there are only a limited vacancies (nearly 500-600) so the selection is quite tough. The selected candidates get a handsome pay in addition to several other incentives of Government jobs and job security. The selection through Engineering Services Examination is through two stages: Written Tests & Personality Test. Only the candidates who qualify the written tests are called for personality test. The written tests are of 1000 marks while personality test is of 200 marks. Elec...

  UPSC -IES SYLLABUS -GENERAL ABILITY Part A :  General English. The question paper in General English will be designed to test the candidate’s understanding of English and workmanlike use of words. Part B :  General Studies: The paper in General Studies will include knowledge of current events and of such matters as of everyday observation and experience in their scientific aspects as may be expected of an educated person. The paper will also include questions on History of India and Geography of a nature which candidates should be able to answer without special study.   NOTE :  IES Syllabus for all branches is same and question papers are also same. Total = 120 Question carry 200 Marks. Time: 2 Hour Syllabus for IES : Indian Engineering Services  Examination ELECTRICAL ENGINEERING PAPER - I (For both  objective and conventional types papers) 1. EM Theory Electric and magnetic fields. Gauss's Law and Amperes L...

World’s smallest transistor created, claim scientists   Scientists have created what they claim is the world’s smallest transistor, using a single phosphorus atom. An international team at the University of New South Wales, Purdue University and the University of Melbourne, has described the smallest transistor ever built in the  Nature Nanotechnology  journal. Michelle Simmons, who led the team, says the development is less about improving current technology than building future technology. “This is a beautiful demonstration of controlling matter at the atomic scale to make a real device. Fifty years ago when the first transistor was developed, no one could have predicted the role computers would play in our society today. “As we transition to atomic-scale devices, we are now entering a new paradigm where quantum mechanics promises a similar technological disruption. It is the promise of this future technology that makes this present development ...

motor Configurations Conventional Configuration (Outer Stator) Outer Rotor Configuration Pancake / HUB Motor Linear Motor Low Inertia / Coreless Motor High Inertia / Gyro Motor Motor with Internal Planetary Gear Assembly

utility pole

solar power system

fuel cell

home solar power system

electrical service dia..

What Do Fuses or Circuit Breakers Do? A fuse or circuit breaker protects the wiring in an electrical circuit from allowing too much current to flow. A short circuit, for example, could be caused by two wires mistakenly crossed (a nail driven through the wall and touching two wires) that could cause a huge current flow and start a fire. Without fuses and circuit breakers, electrical circuits would simply catch on fire too many times for electricity to be considered a safe and practical energy to use. Since equipment will fail and wiring problems will happen, fuses or circuit breakers need to be included in circuits for safety. Fuses work on the simple concept that when current flows through wire it generates heat, the more current flow, the more heat. The thin wire in a fuse will only allow a certain amount of current to run through it until it heats and disintegrates. The thin wire in the fuse is now gone and no current can flow the circuit. When current was flowing through th...

What Should I Know about Generators? I know one thing I wish I'd known about diesel generators is that they need their oil level checked daily if they are running 24/7. I had rented a 25 KVA diesel generator for a factory we were building in the middle of nowhere. That old generator just ran and ran...till it didn't. When the service guys came out and asked me when I'd last checked the oil, I gave them that dumb blank stare. Then I responded with the pitiful, "But you never told me I needed to check the oil." Paying to help repair the engine on the generator helped me remember the lesson. If you need to provide temporary electric on a jobsite, diesel, gasoline or propane generators often solve the problem. Trying to determine the size generator you need can also be a challenge. The following Honda website http://www.hondapowerequipment.com/genwat.asp  shows the power requirements for lots of devices. The big difference in current draw for motors starting vs...

What is the Difference between KW and KVA? Electrical utility companies provide volt-amperes to customers, but bill them for watts. Understanding this concept will help you better understand many of the decisions made by project owners and electrical engineers. Since the Power Law shown above lists Watts = Volts x Amps, you may think that the number of volt-amperes should be the same as the number of watts. After all, that's what the Power Law equation states. And it's true when the load is resistive, say an electrical heating element that uses all the power that is delivered to it by changing the electrical energy into heat energy. A motor or a fluorescent light, on the other hand, are reactive loads in that part of the electrical power that goes to them gets absorbed, then returned to the circuit without being used. The reactive portion of the load dissipates no power. Let's look at it a different way. When trying to understand generators that are specified for a p...

How is Single Phase AC Different from Three Phase AC? To begin with the simple, practical information, single phase AC power requires 3 wires: a hot, a neutral and a ground. Three phase requires 5 wires: 3 hots, a neutral and a ground. In three phase, each of the hot wires can complete a circuit with the neutral. Three phase power can carry more electrical capacity than single phase. Starting a 10 hp motor (starting a motor can require 6 times more power than running a motor) may cause a single phase line to blink or have a low voltage. A three phase line could allow that 10 hp motor to start without problem. Generally, three phase motors are more compact and efficient than similarly sized single phased motors, so the use of three phase motors is widespread. Large motors get used in so many applications: elevators, fans, blowers, compressors, pumps, conveyor drives, etc., so many projects require three phase electrical power. To understand three phase power, think about the 60 c...

What is the Difference between DC and AC? DC stands for Direct Current. A circuit powered by a battery is a DC circuit. Most electronic devices run on DC. Continuing with the analogy of water in a hose, a DC circuit has all the water flow in one direction. The reason why all electrical power isn't DC, though, is because it can't be easily transmitted long distances or changed into other voltages. So the early days of electrical power used DC, but required large diameter wiring (expensive) and local power generators (impractical).  Therefore, a more efficient type of electrical power developed...Alternating Current. When thinking about AC, the analogy of the water hose no longer works well. In AC, the current flow reverses direction in a circuit, flowing first in one direction, then in the other. This reversal of flow takes place 60 times in one second for typical electrical AC power in America. Thus the AC power is called 60 cycle (or 60 Hertz). The normal AC power in m...

What are the Basic Electrical Formulas? If you'd rather look at some electric formulas developed from the US military. Here's another set:

Mention the factors on which hysteresis loss depends Quality and amount   of iron in the core Flux density frequency

How is magnetic leakage reduced to a minimum in commercial transformers By interleaving the primary and secondary windings

Synchronous watt It is that torque which at the synchronous speed of the machine under consideration would develop a power   of 1 watt

What is meant by plugging It means stopping a motor by instantaneously reversing it till it stops

What is jogging It means inching a motor ..i.e.. make it move  a little   at a time by constant starting and stopping

What is the standard di rection of rotation of an induction motor Counterclockwise when looking from the   front end .. i. e non-driving end of the   motor

What is phase-splitter It is a device consisting of a number of capacitors so connected in the motor circuit that it produces from a single input wave three output wave which differ in phase from each other.

How can the motor be protected against single-phasing By incorporating a combined overload and single-phasing relay in the control gear By incoparating a phase-failure relay in the control gear. The relay may be either voltage or current Operated

Hot bearings which increase the load by excessive friction Excessive tension on belt which causes the bearing to heat Failure of short   cut-out switch Single –phasing on the running position of the starter

Enumerate the possible reasons if a 3-phase motor fail to start One or more fuses may be blown Voltage may be too low The starting load may be too heavy