### HAL PAPER - 18 NOV 2008 - KOLKATA

Pattern 160 Questions total.

20 GK and English, 20 Aptitude, 120 Technical questions

In 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

- 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 p-type 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 questions from op-amps (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 questions on D.electronics easy

- one questions from optics (given R.index, Frequency, and asked to find out wavelenght)

- one questions from waveguides (which of the following modes are possible)

- 2, 3 questions 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 questions 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 question on signal flow graph

- theory questions on oscillators

- questions on F.seris (what terms it contain if some condiion is satisfied)

Author : Methari Srinivas

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