for a Electrical Engineer their is a lot of opportunities the Core companies list according to field download the file
click here
click here
Friday, 19 December 2014
Monday, 15 December 2014
Project websites for Engineering students
most of the students don't have internet connection and some problems for searching the projects....
here i search and provide some information and links this will help you for ur projects...
here i search and provide some information and links this will help you for ur projects...
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Tuesday, 21 October 2014
Interview questions 2
BASIC ELECTRICAL ENGINEERING INTERVIEW QUESTIONS ANSWERS 1
[Q] Define Power and Energy?The rate at which work is done in an electric circuit is known as Electric power.
Power = Voltage X Current
The basic unit for electric power is Watts
The instrument used to measure the power is known as watt meter.
The total amount of work done in an electric circuit is called as electric energy.
Energy = Power X Time
the basic unit is Joule or watt-sec
The practical unit is Kilo watt-hour
The instrument used to measure the energy is known as Energy meter.
[ Like this you have to explain elaborately in the interviews. The interviewer will expect detailed answer from the candidate.
If he feels that you are deviating too much, then he will stop you and ask another question. Please don't answer in one line. Add related points
where ever possible]
[Q] In our house are we monitoring/measuring power or energy?
Energy. It is done by energy meter.
[Q] what is meant by cycle in ac waveform? what is period? Define frequency?
One complete set of change in value is known as waveform.
If you any basic question on AC waveform, then first draw an ac waveform and explain with reference to the waveform.
[Q] Explain about various AC Values?
Instantaneous value:
Instantaneous values are the values of the alternating quantities at any instant of time. They are represented by small letters like i, e etc.
Peak value:
The largest value reached in a half cycle is called the peak value or the maximum value or the amplitude of the waveform. Such values are represented by Vm, Im etc.
Peak-to-peak value is the difference between the maximum and minimum values in a cycle.
Average value:
The average or mean value of a symmetrical alternating quantity (such as a sine wave), is the average value measured over a half cycle (since over a complete cycle the average value is zero). For a sine wave, average value = 0.637 times maximum value
RMS Value:
The effective value of an alternating current is that current which will produce the same heating effect as an equivalent direct current. The effective value is called the root mean square (rms) value and whenever an alternating quantity is given, it is assumed to be the rms value.
[Q] What is form factor and peak factor?
The ratio of rms value to average value of an ac quantity is called form factor.
Form Factor = RMS value/ Average value
The ratio of maximum value to the RMS value of an ac quantity is called as peak factor.
Peak Factor = Maximum Value/RMS value
Interview Questions 1
The copper loss (I2R) in the transformer depends on the current I through the winding while the iron or core loss depends on the voltage V as frequency of operation is constant. None of these losses depend on the power factor (cosφ) of the load. Hence losses decide the temperature rise and hence the rating of the transformer. As losses depends on V and I only, the rating of the transformer is specified as a product of these two parameters VxI. Thus the transformer rating is in kVA and not in kW.
[2] Why is the efficiency of transformers more than that of other rotating machines?
There are no moving parts in transformer hence the friction and mechanical losses are absent in transformer. Hence efficiency of the transformer is more than of other rotating machines.
[3] Define leakage inductance
Inductance offered by the winding due to the leakage flux associated with it is called leakage inductance. It is the ratio of leakage flux linkages with the winding to the current passing through the winding.
[4] What material is used in the transformer core?
High grade silicon steel laminations are used for the construction of the core.
[5] What is meant by leakage flux?
Part of the primary flux as well as the secondary flux completes the path through air and links with the respecting winding only. Such a flux is called leakage flux. Leakage fluxes link with the respective windings only and not to both the windings.
[6] Define voltage regulation of a transformer?
The regulation is defined as change in the magnitude of the secondary terminal voltage, when full load ie, rating load of specified power factor supplied at rated voltage is reduced to no load, with primary voltage maintained constant expressed as the percentage of the rated terminal voltage.
[7] What is an ideal transformer?
A transformer is said to be ideal if it satisfies following properties:
- It has no losses
- Its windings have zero resistance
- Leakage flux is zero ie, 100% flux produced by primary links with the secondary
- Permeability of core is so high that negligible current is required to establish the flux in it.
Monday, 1 September 2014
Sunday, 13 July 2014
GATE MATERIALS
some of the students dont have time for gate coaching.so don't worry u can prepare at home
here i say the one link it has ace materials,madeeasy materials,IES,PSU&JTO,......
CLICK HERE TO OPEN FOR DOWNLOAD
here i say the one link it has ace materials,madeeasy materials,IES,PSU&JTO,......
CLICK HERE TO OPEN FOR DOWNLOAD
Tuesday, 8 July 2014
Sunday, 29 June 2014
GATE 2015 Pattern Exam Question Paper Structure & Marking
Gate 2015 exam will be conducted in online mode, which will be a Computer Based Test (CBT) and GATE 2015 pattern are totally changed. Question Paper Structure, Marks distribution is common for CS, EE, ECE, ME, CSE, CH papers:
Total Numbers of Question: 65
Total Marks of GATE Exam 2015: 100
Total Duration: 3 hours
General Aptitude (GA): 10 questions of 15 Marks
Engineering Mathematics: 15 Marks
Technical Questions (subject of the paper): 70 Marks
(2) Numerical Answer Questions: Each question of 1 or 2 marks in all papers and sections. For these questions the answer is a real number, to be entered by the candidate using the virtual keypad. No choices will be shown for this type of questions.
(2) Comprehension: These questions will test the candidate's understanding of the basics of his/her field, by requiring him/her to draw simple conclusions from fundamental ideas.
(3) Application: In these questions, the candidate is expected to apply his/her knowledge either through computation or by logical reasoning.
(4) Analysis and synthesis: In these questions, the candidate is presented with data, diagrams, images etc. that require analysis before a question can be answered. A synthesis question might require the candidate to compare two or more pieces of information.
Marking scheme of GATE 2015 Exam question paper will be as follow:
NOTE : Calculator is allowed whereas charts, graph sheet or Tables are NOT allowed in the examination hall.
Total Numbers of Question: 65
Total Marks of GATE Exam 2015: 100
Total Duration: 3 hours
General Aptitude (GA): 10 questions of 15 Marks
Engineering Mathematics: 15 Marks
Technical Questions (subject of the paper): 70 Marks
GATE 2015 paper patterns contain two different type of questions:
(1) Multiple Choice Questions (MCQ): Objective questions carrying 1 or 2 marks, where each question will have a choice of four answers, out of which the candidate has to mark the correct answer(s), in all papers and sections.(2) Numerical Answer Questions: Each question of 1 or 2 marks in all papers and sections. For these questions the answer is a real number, to be entered by the candidate using the virtual keypad. No choices will be shown for this type of questions.
The questions in a paper may be designed to test the following abilities:
(1) Recall: These are based on facts, principles, formulae or laws of the discipline of the paper. The candidate is expected to be able to obtain the answer either from his/her memory of the subject or at most from a one-line computation.(2) Comprehension: These questions will test the candidate's understanding of the basics of his/her field, by requiring him/her to draw simple conclusions from fundamental ideas.
(3) Application: In these questions, the candidate is expected to apply his/her knowledge either through computation or by logical reasoning.
(4) Analysis and synthesis: In these questions, the candidate is presented with data, diagrams, images etc. that require analysis before a question can be answered. A synthesis question might require the candidate to compare two or more pieces of information.
Marking scheme of GATE 2015 Exam question paper will be as follow:
- For 1-mark multiple-choice questions: deduction of 1/3 marks for a wrong answer
- For 2-marks multiple-choice questions: 2/3 marks will be deducted for a wrong answer.
- For Numerical answer type questions: No Negative Marking.
- No marks for unattempted questions.
- Sectional cut-off (Technical/Non-Technical like Engineering mathematics & General Aptitude) are not applied in GATE exam.
NOTE : Calculator is allowed whereas charts, graph sheet or Tables are NOT allowed in the examination hall.
Tuesday, 24 June 2014
SYLLABUS FOR GATE(EE)
ENGINEERING MATHEMATICS
Linear Algebra: Matrix Algebra, Systems of linear equations, Eigen values and eigen vectors.
Calculus: Mean value theorems, Theorems of integral calculus, Evaluation of definite and improper integrals, Partial Derivatives, Maxima and minima, Multiple integrals, Fourier series. Vector identities, Directional derivatives, Line, Surface and Volume integrals, Stokes, Gauss and Green’s theorems.
Differential equations: First order equation (linear and nonlinear), Higher order linear differential equations with constant coefficients, Method of variation of parameters, Cauchy’s and Euler’s equations, Initial and boundary value problems, Partial Differential Equations and variable separable method.
Complex variables: Analytic functions, Cauchy’s integral theorem and integral formula, Taylor’s and Laurent’ series, Residue theorem, solution integrals.
Probability and Statistics: Sampling theorems, Conditional probability, Mean, median, mode and standard deviation, Random variables, Discrete and continuous distributions, Poisson,Normal and Binomial distribution, Correlation and regression analysis.
Numerical Methods: Solutions of non-linear algebraic equations, single and multi-step methods for differential equations.
Transform Theory: Fourier transform,Laplace transform, Z-transform.
ELECTRICAL ENGINEERING
Electric Circuits and Fields: Network graph, KCL, KVL, node and mesh analysis, transient response of dc and ac networks; sinusoidal steady-state analysis, resonance, basic filter concepts; ideal current and voltage sources, Thevenin’s, Norton’s and Superposition and Maximum Power Transfer theorems, two-port networks, three phase circuits; Gauss Theorem, electric field and potential due to point, line, plane and spherical charge distributions; Ampere’s and Biot-Savart’s laws; inductance; dielectrics; capacitance.
Signals and Systems: Representation of continuous and discrete-time signals; shifting and scaling operations; linear, time-invariant and causal systems; Fourier series representation of continuous periodic signals; sampling theorem; Fourier, Laplace and Z transforms.
Electrical Machines: Single phase transformer – equivalent circuit, phasor diagram, tests, regulation and efficiency; three phase transformers – connections, parallel operation; auto-transformer; energy conversion principles; DC machines – types, windings, generator characteristics, armature reaction and commutation, starting and speed control of motors; three phase induction motors – principles, types, performance characteristics, starting and speed control; single phase induction motors; synchronous machines – performance, regulation and parallel operation of generators, motor starting, characteristics and applications; servo and stepper motors.
Power Systems: Basic power generation concepts; transmission line models and performance; cable performance, insulation; corona and radio interference; distribution systems; per-unit quantities; bus impedance and admittance matrices; load flow; voltage control; power factor correction; economic operation; symmetrical components; fault analysis; principles of over-current, differential and distance protection; solid state relays and digital protection; circuit breakers; system stability concepts, swing curves and equal area criterion; HVDC transmission and FACTS concepts.
Control Systems: Principles of feedback; transfer function; block diagrams; steady-state errors; Routh and Niquist techniques; Bode plots; root loci; lag, lead and lead-lag compensation; state space model; state transition matrix, controllability and observability.
Electrical and Electronic Measurements: Bridges and potentiometers; PMMC, moving iron, dynamometer and induction type instruments; measurement of voltage, current, power, energy and power factor; instrument transformers; digital voltmeters and multimeters; phase, time and frequency measurement; Q-meters; oscilloscopes; potentiometric recorders; error analysis.
Analog and Digital Electronics: Characteristics of diodes, BJT, FET; amplifiers – biasing, equivalent circuit and frequency response; oscillators and feedback amplifiers; operational amplifiers – characteristics and applications; simple active filters; VCOs and timers; combinational and sequential logic circuits; multiplexer; Schmitt trigger; multi-vibrators; sample and hold circuits; A/D and D/A converters; 8-bit microprocessor basics, architecture, programming and interfacing.
Power Electronics and Drives: Semiconductor power diodes, transistors, thyristors, triacs, GTOs, MOSFETs and IGBTs – static characteristics and principles of operation; triggering circuits; phase control rectifiers; bridge converters – fully controlled and half controlled; principles of choppers and inverters; basis concepts of adjustable speed dc and ac drives.
bit 1
Q: Two incandescent bulbs of 40 W & 60 W rating are connected in series across the mains.Then
a) the bulbs together consume 100 W
b) the bulbs together consume 50 W
c) the 60 W bulb glows brighter
d)the 40 W bulb glows brighter
a) the bulbs together consume 100 W
b) the bulbs together consume 50 W
c) the 60 W bulb glows brighter
d)the 40 W bulb glows brighter
Monday, 23 June 2014
REASON
hi dudes..
the main motive to create this blog is to DOLE (distributes,shares of something) information regarding electrical engineering...
the main motive to create this blog is to DOLE (distributes,shares of something) information regarding electrical engineering...
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