2015 GATE EE PAPER ANALYSIS

GATE 2015 Question Papers and Answer Keys 
[from organizing iit/iisc website]



SET 1 / MORNING SESSION                SET 2 / AFTERNOON SESSION


Detailed sollution by Gateforum
                                                           set 1           set 2

ANALYSIS

Forenoon Session/SET 1

SUBJECT QUESTION NO MARKS RELATED TO THAT QUESTION TOTAL MARKS  Network Theory  2, 8, 9, 27, 51 & 55 3x1=3, 3x2=6 9 Control System 4, 6, 7, 33, 39, 42 & 44 3×1=3, 4×2=8 11 Signal & System 21, 34 & 43 1x1=1, 2×2=4 5 Digital Electronics 15, 26, 36 & 50 1×1=1, 3×2=6 7 Analog Circuits 1, 5, 16 & 32 3x1=3, 1x2=2 5 EMT 13, 14 & 53 2x1=2, 1x2=2 4 Measurements 12, 17 & 46 1×2=2, 2×1=2 4 Machines 19, 20, 23, 30, 35, 41 & 45 1×3=3 , 2×4=8 11 Power System 3, 18, 28, 29, 47 & 52 2×1=2, 4×2=8 10 Power Electronics 10, 37, 40, 48 & 49 1×1=1, 4×2=8 9 Mathematics 11, 22, 24, 25, 31, 38 & 54 4x1=4, 2x3=6 10 General Aptitude 1, 2, 3, 4, 5, 6, 7, 8, 9 & 10 5x1=5, 5x2=10 15

Afternoon Session/SET 2

SUBJECT	QUESTION NO		MARKS RELATED TO THAT QUESTION		TOTAL MARKS
Network Theory	8, 17, 20, 28, 35 & 55		3x1=3, 3x2=6		9
Control System	15, 23, 26, 30 & 41		2x1=2, 3x2=6		8
Signal & System	27, 34, 42 & 48		0x1=0, 4x2=8		8
Digital Electronics	13, 49 & 52		1x1=1, 2x2=4		5
Analog Circuits	1, 2, 3, 14, 22 & 32		5x1=5, 1x2=2		7
EMT
Measurements	10, 18 & 40		2x1=2, 1x2=2		4
Machines	9, 19, 21, 25, 31, 33, 36, 39, 44, 45 & 51		4x1=4, 7x2=14		18
Power System	4, 16, 24, 37, 43 & 46		3x1=3, 3x2=6		9
Power Electronics	50, 53 & 54		0x1=0, 3x2=6		6
Mathematics	5, 6, 7, 11, 12, 29, 38 & 47		5x1=5, 3x2=6		11
General Aptitude	1, 2, 3, 4, 5, 6, 7, 8, 9, 10		5x1=5, 5x2=10		15
Total			100

Type of Questions asked from set 1 + set 2

Networks	Two port networks, Thevinin's theorem Basics of networks, Transient Analysis, Steady state analysis
Analog Circuits	Op-amp, FET amplifier, BJT Amplifier, Diode Circuits-Analysis and Application, Transistors
Digital Circuits	Flipflops, logic gates, Counters, Excitation machine, K-map, Boolean Algebra
Signals and Systems	Sampling, Filter, System analysis, Linear Time Invariant(LTI) Systems, Basics of signals and systems
Control Systems	Nyquist plot, Root locus, Bode-plot, Stability & Routh Hurwitz Criterion, Feedback control systems, closed loop control systems, State space analysis, Signal flow graphs, Transfer Function
Electrical Machines	DC Machine, Transformer Losses, Induction Machine, Synchronous Machine, Special Machines
Power Systems	Load flow studies, GMR, per unit systems,  Transmission Line, Economics of Power Generation, Fault analysis, Power Factor correction
Power Electronics	Phase controlled converters,  Basics of Power Semiconductor Devices, Input power factor, Chopper, Inverters, buck boost chopper
Measurements	Frequency measurement, DVM, power factor measurement, energy meter, Error analysis, CRO, Wattmeter
Electromagnetic fileds	Dielectric field, spherical charge, Electric Field, Magnetic field

SET-1

Aptitude Section: 

In aptitude section numerical and verbal aptitude questions were standard and as expected with an exception or two. its very easy to get 10-12 marks..

Technical SECTION

Most of the questions were straight forward with some theory questions from topics generally untouched by students during GATE Preparation and rest of the questions were either lengthy or non-trivial. Most questions required basic understanding of the core topics and a good analytical bent of mind.

The 2 marks questions were straight forward and were concept based – easily done if one read the questions properly. Machines were predominantly DC Machines questions that seemed tough on a first look but were easy if understood. Power Systems required good analytical grasp over the subject as the questions involved were non trivial and required a good amount of thinking.

Well some questions seemed tough and way out of my league. Maybe I would have left them if I were attempting the paper.
SET-2

Aptitude SECTION

In this section there was even distribution of Numerical and Verbal ability. Some questions in this paper turned to be outstanding and it would be easy to score 8 to 10 marks in this section.
TECHNICAL SECTION

1 Mark Questions   were pretty basic and needed clear calm thinking to figure the answers out. Some questions like the ones on Electric and Magnetic fields required the most basic understanding of the concepts studied maybe in Class XII. These concepts are easily forgotten by students and were completely unexpected in this question paper. Therefore they might have not been attempted by many students.

Overall the questions were concept oriented and not formula based; another new feature for GATE 2015. Machines again were DC Machine oriented questions that required just a bit of thinking to solve them.

2 Mark Questions questions seemed very basic and easy enough provided one devoted a bit of time to solve them. The questions from Electric and Magnetic Fields were good. One or two questions were such that it was difficult to place the chapters they are from.

Overall:

DC Machines questions dominated both sessions which was not as per expectations and not as per the normal trends. The Question Papers were more conceptual in nature than formula based. Overall, the papers featured a very good blend of conceptual and tricky questions along with pretty straight forward ones.

One can expect the cut offs to be lower than earlier years but I personally felt that this year’s papers were good and better than last year. The general consensus though amongst students is that it was a tough paper in all. So expect ranks to be better for the same marks when compared to last year.

Important topics from each subject based on weightage in GATE-2015 

• Electrical Machines: Transformers and DC machines.
• Engineering Mathematics: Graphs, functions, relations, mathematical logic, Linear Algebra, and Calculus.
• Power Systems: Fault Calculations, Transients, Basics of Transmission & Distribution.
• Control Systems: Time Domain Analysis, Root Locus and State variable Analysis.
• Electric Circuits: KCL, KVL and Sinusoidal steady state Analysis.
• Analog Electronics: OP-Amp and DC-biased BJTs
• Digital Electronics: Boolean Algebra and Sequential Circuits
• Power Electronics: Choppers and Rectifiers
• Signals and Systems: Linear Time Invariant Systems and Z-Transform

NOTE:

• Even a 1/3 mark will create big difference in your GATE Rank/Score. Never attempt any questions in which you are not confident.
• Try to avoid answering questions based on your assumptions.
• Never try to attempt questions from new topics, which you have never touched.
• Every question is important whether it is a 1-mark or 2-mark.
• Understand the question is important rather than answering the question in a hurry.

NOTE: all the informations collected from gate academy/ gateforum/ kreatryx  website