bsnl je 2016 25 sep 2016 afternoon questions

GENERAL ABILITY:

1Brightest planet
2Art of living founder
3Tropic of cancer does not pass through which state
4antonym for prosperous
5antonym for abbreviate
6some sentence rearrangement
7secretary of saarc in in which country
8decimal system is first used by
9purity and density of milk is measured by

BASIC ENGG AND SPECIALIZATION:


1half adder is also known as
2visible region lies bw between which two regions
3clads an conduction angle
4 1 dit=
5hysterisis
6 0.375 in binary
7semiconductors have negative temp coefficient
8 which of the following is digital-pcm
9t flipflop char eqn
10depletion region is formed due to 
11 binary value of 15
12parallel to serial converter - MUX
13 ----- is machine language
14A square =2A then a=
15 for critical damping k=1
16physical address of 8086 is
17speech signal range
18two capacitors are given and find v across one capacitor
19two vectors given are orthogonal then value if x
20diagonal elements of skew symmetric matrix
21intrinsic impedance of free space
22 divergence of given vector
23sensitivity of voltmeter
24integral of sincubex
25interrupt memory location of 8086
25integral DX by 4+9
26reverberation time q
27iby t is the unit of
28ascii full form
29how many status flags in 8085
30beta in terms of alpha
31fourier transform of sine wave is
328086 can address memory locations up to
33crossover distortion occur in
34nand = negative nor
35 potential diff is scalar or vector
36 wavelength is measured in
37input impedance of voltage and current amplifier
38which of following is analytic
39one mb =
40 lead lag circuit
41 charge if electron
42two port reciprocal condition
43thermicouple is active or passive transducer
44laser is device having
45gain at high freq falls due to
46 final value of given function
47capacitor van be charged in
48 transformers convert voltage current
49 some statements regarding matrix properties
50convex mirror image que
51 norton circuit results in I parslle with r
52differential eqn fill in blank q
53oscilloscope measures -- v
54delta circuit current ratio
55odd Num of the following hexadecimal Num are given
56cofactor matrix transpose =
57 some circuit ans I=1.14
58 three bulbs are connected in parallel if one of the bulb us fused then
Statements are given
59 USB drive volatile or non volatile
60 integral of log( some fn)
61depth of well
62reluctance in magnetic circuit is similar to - electric circuit
63 7 segment led 100 displays
64 high Q has ---some statements
65 tcp port number
66 peak time is the time required to
67fading of microwave que
68forces in solids are fair or strong
698080 does have instructions RIM SIm
70 q meter works on the principle of     
71 some reaction then uranium A Z
72.during stop band the impedance is
73 some circuit op=axorbxorc
74 to delete all rows what was the command
75 flat response of amp is due to
76multivibratir used for producing pulses or something
77 power consumed some circuit
78mathematical operations are performed by--ALU
79i 50% mod given and what is i when 90% mod
80synchronous motor questio 

BARC ece written exam 2016

Most of the questions are from gate syllabus.and from non gate i got questions from computer networks(TCP IP), from c language,measurements also.Here i am discussing some questions which I remember.

DIGITAL:

1)two muxes are cascaded and we are asked for its output
2)0.1101111 of base 2 to decimal conversion
3)some 8 bit binary numbers are given and asked for which number is divisible by some binary 8 bit number(01110110)
4)a logic gate implementation using diodes is given
its answer is like (X+Y)Z.

ANALOG:

1) A log amplifier is given asked for its output v2-v1 when two differnt inputs 1v and 3v are given.
its ans is log3.
2)Relaxation oscillator is given using opamp.and asked for its waveform at non inverting terminal input.
3)An opamp is given such that it has inputs both at inverting and non inverting terminals.when switch is connected to position 1 then inverting terminal has input v1 and non inverting terminal has input noise voltage Vn .when switch is in position 2 only non inverting terminal has both sources v1 and Vn..They have asked gains when switch is in position 1 and 2
4) A clamper circuit is given asked for its output.

SIGNALS AND SYSTEMS:

1) band pass signal is given and asked for its minimum sampling rate
2)a differential equation is given and asked for its output when input is step.
3) exp(-2t)u(n-2),whether the system is stable,causal.

COMMUNNICATION:

1) the question is about frequency deviation comparison.when two signals are cos(200pit) and cos(400pit).when k is constant.compare frequency deviation
2)some statements are given regarding frequency deviation like it is prapotion to frequency ,independent of f,directly praportional to amplitude.asked for correct statement.

CONTROL SYSTEM:

1)  question is like finding the k value for which the system is stable.
2) regarding the gain margin ,phase margin
3)one question from polar plot. asked whether  pole/zero is  nearer to origin.

NETWORKS:

1) a circuit is given and asked for voltage across one element
2)a current source and some (around 8 resistors) are in parallel to it .asked for current through one resistor.
3)from transients a current equation given and aksed for relation between L and R.(time constant from eqution has to be taken).

ELECTROMAGNETICS :

1) characteristi impedance ,phase velocity ,operating frequecny ,load impedance is given asked for Zin.
2)asked for cutoff frequency of dominant mode parameters are given.
3)potential is given .asked for electrostatic potential

ELECTRONIC DEVICES:

1) Conductivity is given.Permitivity is given.asked for frequency at which conduction current density is equal to displacement current density.
2)Mathing question is given like following

chemical vapour diposition----------------------epitaxial diffusion
photolithography---------------------------------- mask pattern
and some third term i didnt remember.
3)For ohmic contacts the work function of metal and semiconductor are greater or less
4)in reverse bias of schottky diode, the direction of motion of electron is from metal to semiconductor or from semiconductor to metal.
5)some statements are given regarding the ion implantation .asked for right one.
6)which of the following does not exhiit negative resistance
a)zener b)tunnel c)impatt d)PIN

COMPUTER NETWORKS:

1) Question is on tcp ip
2) some statements regarding cache memory. asked for right one.
3)one question from c program.

QUESTIONS ON SEQUENTIAL CIRCUITS-1

1why flip flops are edge triggered and latches are level triggered?
2.what is meant by race around condition?
3.what are the  types of master slave flip flop?

HELIUM

source:news papers

WHY RANK OF MATRIX?

Generally we will find the rank of matrix.Most of us dont know why do we find.One application of determining rank of matrix is in solving networks problems.Network consists of several meshes.There we write current equations in the form of matrix and will find the rank of  matrix.If the current flowing in one mesh is depending on another mesh current then the rank of the matrix will be less than the order of the matrix.

Conditions of a two port network

The conditions that have to be obeyed by the two port network are
1) the components present inside the network should be passive elements and dependent sources only
2) The current directions at input and outputside must be into the network.

Classical and wave-mechanical model of electron

For large scale phenomenon,such as electronic trajectories in a vaccum tube,the classical model yields accurate results.For small scale systems,however such as an electron in an atom or in a crystal,the classical model treated by newtonian mechanics gives result which do not agree with experiment.To describe such subatomic systems properly it is found necessary to attribute to the electron a wavelike property which imposes restrictions on the exactness with which the electronic motion can be predicted.