HAL Placement Paper
Paper Type : Technical  Other
Test Date : 18 November 2008
Test Location : WEBEL HRDC Kolakata
Posted By : Methari Srinivas
HAL PAPER ON 18th NOVEMBER AT KOLKATA
Pattern 160 QSNs total.20 Gk and English,20 Aptitude,120 Technical
qsnsIn GK ;
From which of the following the sentence is taken from "SATYAMEVA
JAYATHE".And the options were ramayana, upanishad.etc
How many seats will be there in Rajyasabha:
English questions were easy:
Technical: concentration on analog electronics
Ex;wein bridge oscillator has which feedback(Ans.both positive and
nagative)
what is cascode amplifier?
High Zin & Zout amplifier requires topology (Ans current
series)
2 problems on finding gain with feedback and change of feedback gain
with change in gain.(Just formula substitution)
2 problems on power amplifiers (some dissipation power is given and we
have to calculate ouput current or something)
2 to 3 questions on RC coupled amplifier (theoritical)
problem on ni ,pi intrinsic concentrations And if the material is doped
with ptype then what is correct from the following options were:a)ni.pi=np
b) ni+pi=np etc.
porblem on zener diode one qst from Hall effect ie in which direction
does the force or something act....
2 qstns from opamps (easy)
Control system:
correct order to increase stability of a system.......options were
gain,feedback,derivative control feedback,gain,derivative control
derivative control,gain,feedback
The ve real axis nyquist plot is mapped into in bode plot
options were 180 phase shift line180 phase shift line
10dB line etc.....which of the following is time domain techniques of
system stability nyquist,root locus,polar plot,bode plot
one problem on bode plot(just verification)
problem on finding resonant frequency given Ch.equation
Communication:
an FM wave is passed trough a frequency trippler what is its modulation
index(given modulation index of FM wave)
power problem on AM
preemphsis is used for
some qsns on D.electronics easy
one qsn from optics (given R.index ,Frequency ,and asked to find out
wavelenght)
one qsn from waveguides (which of the following modes are possible)
2 ,3 qsns from antennas
yagi uda antenna contains what?options given
Ft of guassian pulse is optins guassian,rayleigh,etc...
psd of white noise is options uniform,non uniform etc...
some qsnts on correlation
h(t)=ePOW(kt) and i/p is sinwt then what is
o/p(signals)
12 ,1 ohm ressistors are used as an edges to form a cube then what is
Req b/w two diagnolly opposite corners of the cube
one problem on finding time constant for a ckt of RLC
one problem on resonance given some parameters we have to calculate the
current through L at resonance.......
one theory qst on signal flow graph
theory qstns on oscillators
qsnts on F.seris(what terms it contain if some condiion is satisfied)
That's all I remembered............
ALL THE BEST
bye....... 


