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HAL PREVIOUS EXAM PAPER for Electronics

Thursday 18 August 2011
Published by Roma Rahul Gupta for Chhattisgarh Online
HAL PREVIOUS EXAM PAPER for Electronics check here:
This previous paper is totally based on candiadate's experience.

The test consists of 160 qs. Duration is 150 min .
First section 20 qs related to General awareness and English
Second section 20 Qs related to mental ability and Quantitative ability.
Third section 120 Qs purely related to your Technical subjects .


1>General English=10 ques (type=easy)
2>Aptitude (mathematical)  = 12 ques  (r.s. agrwal, easy) main portion time n distance, work energy, streams,etc
3>Genral knowl =10 ques (current events n easy type)
4>Technical

There r nearly 120 question from the technical branch which is from the engg syllabus (from 1st sem to 8th sem) .here m going to tell the important subject with respective marks:
a>analog circuit=20 (problem type ques .like op-amp diagram prob)
b>digital circuit=30 (theory + problem, multiplier, decoder, code transformation, Boolean  expression, etc. most important part)
c>communication=30 (mostly problematic. Like fm, dm, ask, fsk,)
d>control system=5 (problem on transfer function)
e>networks=12 (problem type)
f>antenna=5 (easy theory type)
General Knowledge

    Lucknow is popular for which fruit

a)Mango         b) Orange         c) Water fruit

    Governor of Uthar Pradesh
    President of India
    In which district of UP a oil refinery is found
    Pigeon is the indication of
    The chemical Formula of salt
    Republic day in India is celebrated on
    The “Beating the retreat” hasn’t celebrated on republic day, what is its reason…
    Lucknow city is located near which river
    Firozabad is popular for
    Renukot is popular for
    The first prime minister of India
    The first President of India
    The birth day of Pandit Jawahar Lal Nehru is celebrated as:-
    The writer of ‘Godan’
    Word ‘Agfa’ is related to:--

Electronics Questions

1.      When the temperature of the room increased then the energy of semiconductor…

2.      Power diode is generally made from: - Silicon/Germanium/Both/None of these

3.      Thermionic Emission of electron is due to………….

4.      When the both junction of NPN diode is reverse biased, then the diode is in which mode: -

      a) Active          b) Cutoff          c) Saturation     d) inverted

5.   Which transistor mode gives the inverted output: -

      a) Common Emitter      b) Common Base         c) Common Collector   d) None of these

6.   Which coupling gives the higher gain in case of amplifier: -

      a) Capacitor coupling    b) Impedance coupling c) Transformer coupling

7.   Which distortion is least objectionable in audio amplification: -

      a) Phase    b) Frequency   c) Harmonic   d) Intermediation

8.   A narrowband amplifier has a band pass nearly…………of central frequency:-

      a) 33.3%          b) 10%             c) 50%

9.   Frequency of wein bridge oscillator

10. Phase shift oscillator consists: -

      a) RL   b) RC   c) RLC

11. Crystal oscillator frequency is very stable due to:-

12. Multivibrater Produces: -

      a) Sine wave     b) Square wave            c) Smooth wave           d) sawtooth

13. Convert the 101101 Binary number into octal no: -

      a) 65    b) 55    c) 51    d) 45

14. 10 in BCD: -

      a) 10100          b) 1100            c) 010111        d) None of these

15. Which PNP device has a terminal for synchronizing purpose:-

      a) SCS             b) Triac            c) Diac             d) SUS

16. In 3-Phase full converter, the output during overlap is equal to……………..

17. Addition of indium in semiconductor crystal makes: -

      a) PNP             b) NPN

18. Free electron exists in which band: -

      a) 1      b) 2      c) 3      d) Conduction band

19. Ripple factor of half wave rectifier: -

      a) 1.21             b) 0.48             c) 0.5

20. Efficiency of half wave rectifier: -

21. Transistor that can be used in enhancement mode:-

      a) NPN            b) UJT             c) JFET            d) MOSFET

21. Following contributes to harmonic distortion in Amplifier: -

      a) +Ve feedback          b) –Ve feedback          c) Defective active device

      22. High cutoff frequency: -

            a) CB               b) CC              c) CE

23. Which is used as data selector?

      a) Encoder       b) Decoder       c) modulator     d) Demodulator

24. Read write capable memory: -

      a) RAM           b) ROM           c) Both             d) None of these

25. When modulation frequency is doubled, modulation index also doubled in case of: -

      a) FM              b) PM              c) AM              d) PM & FM

26. Term ’Noise temperature’ is used for

27. Video detector used in TV receiver is a….

      a) Diode detector         b) Ratio detector          c) Phase detector

28. Which isn’t directly operated from mains: -

      a) Half wave rectifier     b) Centre tap rectifier    c) Bridge rectifier d) Voltage doubler

29. In 3-Phase half wave rectifier each diode conducts for duration of: -

      a) 30 Degree    b) 45 Degree    c) 60 Degree    d) 180 Degree

30. If number of phase in a multiphase rectifier increased then: -

      a) Output increased      b) Output decreased     c) Output smooth          d) No change

31. Which output requires minimum filtration: -

      a) Half wave rectifier     b) full wave       c) SCR half wave rectifier d) Voltage doubler  

32. Identify the under circuit

a) Low pass filter    b) High pass filter          c) Band pass filter

33. Transistor is a following operated device: -

a)      Low voltage & low current device

b)      Low voltage & high current device

c)      Low current & high voltage device

d)      High current & high voltage device

2008 paper******
THE ONLINE TEST FOR ELECTRONICS BRANCH CONTAINS III SECTIONS

SECTION I- ENGLISH 8 Questions almost & GK 12 questions  
 Q      if you _ _ _ go now,you will miss the train.
          a)can not b)will not c)do not  d).....
 Q      Two Short Passages For Two Questions were there.
 Q      Antonym for QUELL
 Q      some sentence correction Questions were there.
 Q      Wherer is 2012 olympic going to occcur?
 Q     By which bird spring season is guessed?
 Q     Which word in Harry Potter opens The door?
 Q     In which country the Renaissance was started?
 Q     in which country's post card the word "Pelsalvinia" is used.(word may be wrongly spelt here)
 Q     Which was hema malini's starting film.
         a)meera b)lal pathar c)... d)...

SECTION II- ARITHMETIC & GENERAL APTITUDE 20 questions IN ALL
 Q  find odd man out
      a) ashwarya rai b)susmita sen c)...shirodkar d)....barar e).....joseph
 Q  if A is C's aunt,B is A's husband, D is brother of C Then B's relation to C is?
 Q  some Questions on series were there.
 Q  Two Questions on "find the correct symbol next appearing in the series"

SECTION III- TECHNICAL(SUBJECT ORIENTED) 120 questions IN ALL

 ELECTRIC MACHINES/ PURE MATHEMATICS--NO QUESTIONS

 ELECTROMAGNETICS--4 tO 5 questions

Q     transmission lines versus wave guides difference. true statement options were to be chosen)
        a)i&ii   b)i&iii   c)....   d)......
Q     Problem was given Find the dominant mode.
Q     problem on loss less wave guide

COMMUNICATION--- 10 TO 15 questions
Q     if ...frequency is modulated by two frequencies....&....which freq component will not be      present in the output spectrum.
Q     which band of frequencies are used in satellite communication
Q     find correct block sequence for am receiver  a)... b)... c)...  d)...
 DIGITAL  ---- 15 TO 20 questions

 Q     2's Compliment OF 17
 Q     wait states in microprocessor are used for  
          a)to interface slower hardware b)in Dma mode  c)....  d)....
 Q     the content of registers HL & SP after this program
           1000  Lxi SP 28FF
           1003  CALL 1006
           1006  POP H
  Q     Which gate has its output one when all its inputs are zero.


 COPONENTS ---- 10 QUESTIONS

  Q     infrared LED are grnerally made of
          a) si & As b)si & ge   c)si & ge & p
         OP AMP-----3 TO 4 questions
  Q     in inverting mode input  voltage was given asked o/p voltage.

          VLSI   ---1question
  Q     in sequential logic o/p is dependant on _ _ _
           a)only present i/p    b)only past o/p      c)present ip & past op   d)....
           ANALOG CKTS   ----10 TO 12 QUESTIONS
  Q     Which coupling is used in fm de/modulation
           a)RC   b) LC c) direct   d)......
  Q      this feature describes CE amplifier
           a).....b).....c).....  d).....
  Q      two problems on self inductance and mutual inductance.

         NETWORKS    -----8 TO 10 QUESTIONS
  Q     find VTh if rest all ckt info is given
  Q     problems on RLC ckt
  Q     problem on two port n/w ip & op impedence


         CONTROL SYSTEMS & SIGNAL SYSTEMS ------ REST OF THE QUESTIONS
  Q      many Q on "check the stability of given equation"
  Q      Laplas Transform of 1 is_ _ _.
  Q      questions on root locus bode plot
  Q      response of this system is
           a) exponentialy increasing   b)decreasing  c)30    c)60 degree
  Q      given system is a)causal b)linear  c).... d)....
1.Time constant of a RC network ?
Ans: RC

2.Define peak factor?

3.Hexadecimal and BCD representation of decimal no 43?

4.What is the use of WAIT instruction used in microprocessor?
Ans:  to interface the slow peripheral devices to the MP.

5.Crossover distortion is present in which amplifier?
Ans: Class B.

6.2's compliment representation of -17 ?

7.The largest negative no can be represented with 8 bits in 2's compliment representation?

8.Each cell in RAM is designed using ___________ ?

4 to 5 questions from R-H array in contol systems in this the system eqn is given and asked to find the stability of system.

Two Q's abt Nyquist criteria ?

9.Wt is the use of Bode plots?

10.Wt is the use of time response analysis?

11.The model transform function of a All pass filter I know the ans but I can't type here?

12.Unit impulse is the input to RL network then wt is the output?

13.For Tx line given Zoc and Zac then asked to find out characteristic impedance Zo?
Ans : Zo= sqrt of(Zsc*Zoc).

14. And for a tx line given L and C value asked to find out impedance of the tx line?

15. A q's to find out the VSWR and reflection coefficient?

16. How the electric and magnetic fields are related in a EM wave?

Two q,s on calculation of efficiency of class B amplifier.

17. The device in which negative resistance characteristics are present?
A) FET b) SCR c)UJT d)tunnel diode.

18. Advance photo diodes are used more in opticalcommunicatoin compared to PIN diode why?
A q's on potential barrier in diodes.

19. A ckt of voltage regulator is given and asked to find the load resistance.

20. A transistor is in saturation when both junctions are reverse biased.

21. In ce amplifier the capacitor Ce provides which feedback?

22. A q's on FET amp to find Vds gives Vgs and Igs.

23. Frequency of Rc-phase shift filter given R and C values?
Communications

24. In AM given modulation index and total power asked to find out the carrier power?

25. In FM given a eqn of FM and asked to find out modulation index?

26. A q's from PM.

27. What is the use of pre-emphasis ckt?

2 to 3 q's from furrier sereices.

28. 1 q's from cross correlation.

From networks 4to 5 q,s all are easy

29. Superposition therom is applicable for which networks?

30. Given no of loops and no of nodes and asked to find no of braches.

31. In network graphs 2 more q's are there.

GK(10) English(10) are easy u can do easily like oldest mountains (aravali mountains)

Appitude(20) is easy all are reasoning based q's very easy.

Final conclusoin is read control systems, EDC, analog electronics, communicatoin theory, tx lines, networks,digital electronics,signals and sytems its enough read well u can get it .try to remind some formulaes from amplifiers since siome problems are given from them.

*******************
40 questions comprising of English (grammar, synonyms etc),general knowledge(i dunno where they get those questions from!),general quantitative aptitude questions(series... quite easy ie. solvable if thought over). And rest 120 technical questions from:

-Digital circuits(karnaugh maps etc...)    
-electronic circuit theory(all ckts ie. voltage series, current series etc.. and their formulae n properties)    
-Antennas, wave prop    
-Communication systems (all types of modulation:analog  and digital,preemphasis, receiver ckts... etc etc)    
-Control system engg (bode plot,nyquist,root locus etc...)    
-Mathematics (equation solvin, laplace etc)    
-Pulse n switchin circuits(schmitt trigger, etc..) and so on…

4 options given for each question n hell no negative markin!!! :-D



The ones I remember:
1)  Kolkotta: hoogly, rangoon :? A]brahmaputra b]harbour c] n d] don remem..
2)  Which flower was brought from Madagascar to India outta following.. a]hibiscus b]…
3)  Opposite of word ‘quell’
4)  Preemphasis involves ------ of signal.. a]expansion b] compression….
5)  Sum of prime nos. betn 61 to 75…(hell easy.. u see now?)
6) Ic,Ir,alpha given, find Ib… for a given typa ckt…
7)  End fire antenna how many times stronger than broad array ant…
8)  System is stable if..a]root locus on neg side ..somethin like tht(sorry!)
9)   Schmitt trigger used for a] delay b]…..
10) 1K in Dig elec means a]1000 bits b]1024 c]…  (Phew!.. hehe)
11)  Puranas contain a]hymns of god b]mythology c]about life….
12)  Campaigns have to be stopped how many hours before actual poll…in India ..
13)   Jog falls are formed by which four streamlets….?
14)   Calculative sums  on modulation .. don’t remember!
15)   L1,L2 given find Mutual inductance…
16)   Somethin about servo motor..

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 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 qstns 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 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)

1.Which one is the oldest Ved.
a)Rig ved
b)Arth ved
c)Sam ved
ans is a

2.Who is the Man behind Super man ?????????
3.Aryabhatt was lauched from?
a)usa
b)R.s.s.a.
ans is a)

4.Flying any plane is prohibited on which building in India?
a)loksabha bahwan
b)India Gate
c)Taj Mahal
ans is c)

5.TODA tribals were found in?
a) manipur
b) jharkhand
c) sikkim
i think it shud manipur bt not confirmed

6.some questions on prepostions.
7.some on correct sentenses
8.one on conclusion of para.

In aptitude just easy series ,hcf, multiplictaions quite easy ones .

The most toughest part is Technical. Idont remember all the questions but still giving a idea how to prepare.
1.All equations of transistors actions .(with numericals)
2.Diode equations, junction capacitance.
3.Op-amp in different modes like in negative feed back(with formulae).
4.FET Operation, Threshold  Voltage,and equation.
5.Control systems, Nyquist  criterion, Root locaii, Nicholas, Bode plot, Routh  Hurwitz Criterion.
6. Characterization of Control system based on transfer function and characterization
7.Effect of adding poles and zeros on the system stability.
8.effect of lead and lag phase networks
9.some questions about networks numericals for rms values avg values
10.some questions on magnetism of a material,wire,magnetic field (numericals).
11.some questions form EMFT on transmission lines,wave guides.
12.Trans conductance of transistor,hybrid model.
13.Questions on Tree,Graph in Networks.
14.Types of amplifiers like Class A,B,c.
15.Cascaded filters.
16.convolution.
17.Numerical on sampling theorem.
18.Fourier series and long sinusoidal function and then tell the avg value of that signal.
19.RLC circuits with wattage  n calculate the currents n ...
20.AM,FM ,Envelope Detectors n many more.
21.PI,PD,PID and the effect of derivative and integral cotroller action.

Technical:
1. what is used for heat dissipation in ICs
2. for an amplifier, given IC(dc) and IC(ac)(p) for a 1k load calculate avg dc power dissipated.
3. given hfe calculate hfc.

4. given ICBO,ICO and a calc ICEO.

5. for common collector configuration o/p current is IE/IC/IB/..
6. which configuration amongst CC/CE/CB gives no current gain.
7. SiC is which group compound
8. pipelining is implemented in RISC/CISC/…
9. given transmitted power and modulation % for AM calc avg sideband power.
10. spectrum of sinewave contains how many components.
11. which of the following signals supports snoopy cache protocol arbitration signal/cache support signal/…
12. for an n-bit multiplicand and multiplier the booth,s algorithm generates how many bit product.
13. which window achieves smaller sidelobe width at the cost of greater mainlobe twidth hamming/hanning/Blackman/Kaiser

14. a highpass RC filter behaves as pure differentiator when ?t<<1/?t>>1/…
15. what is the lowest atomic concentration that can be measured using SIMS boron concentration method.

16. what type of bond is present in Si and Ge.

17. dynamic characteristics of capacitive transducers are similar when used as HPF/LPF/…

18. what is used as switching element in SMPS at 20-100 kHz UJT/thyristor/triac/MOSFET.
19. how can CMRR be increased-by increasing source resistance/emitter resistance/collector resistance/..
20. avg value of a HWR current signal of peak value Im.
21. given 3 dB bandwidth and resonance freq of an RLC ckt calc its Q.
22. how many tokens are present in C- 0/1/2/3.
23. for a stretch of code as int a;a=5/2; what will be the value stored in a.
24. what does the statement volatile int a mean in C.
25. ASCII code of Z.
26. for a stretch of code as char a =252;a=a+5; what is the value stored in a.
27. one problem on binary to hexadecimal conversion.
28. 212 address lines address how much memory.
29. 220 address lines address how much memory 2G/2M/…
30. another name for single transfer mode in direct transfer.
31. what signal used for DMA in 8085.
32. sequence of instruction cycles for PUSH B.
33. what are the various steps in one machine cycle of 8085.
34. response time of PIN diode.
35. range of current signal in RS232 serial transfer mode.
36. when an electron is injected into a circular conductor surrounded by an insulator what will happen- it will distribute uniformly/move to the surface/…
37. for a solenoid with end A connected to +ve terminal and end B to –ve terminal what will happen end A will be north pole/end B will be north pole/both will alternately be north poles/it won’t behave as a magnet.
38. what is the value stored in an un-initialized static variable in C.
39. what transistor is used in VLSI.
40. number of gates used in GSI.
41 supply voltage in HTL logic.
42. given a K-map,obtain a simplified SOP form.
43. 2’s complement of –ve 1011.
44. 2’s complement of another binary number.
45. why are synchronous ckts difficult to design –they have fast response/they have stability problem/…
46. given 4 equations identify which conforms to Boolean algebra laws.
47. when lower byte is used to address MSW what is it called big endian/little endian/…
48. a 6 V peak sine wave is given to one of the inverters of a 7414. after what value will the o/p change from high to low.
49. given two sequences,calc their product.
50. given two sequences find their convolution.
51. find the ROC of a right sided exponential sequence.
52. the property x(t)*h(t)=h(t)*x(t) is called commutative/associative/distributive/…
53. given the sequence y(n)=5cos[4pn/31 + p/5] find the fundamental period of it.
54. in what type of control is hysteresis present -P/I/D/on-off.
55. given mmf and reluctance, calc flux.
56. max no of peripherals that can be connected to 8085 through a PIC.
57. why is class B modulation preferred to class C modulation.
58. given a telemetry channel in which a 4 kHz bandwidth signal is carried by two carriers of 36kHz and 48 kHz calc the freq bands occupied.

59. LVDT is a electrostatic/electrical/electromagnetic/electromechanical device.
60. order of resistance of shunt coil used in Q-meters.
61. what are the minority carriers in an n-type material.
62. the band formed when energy associates combine with valence electrons is…
63. depletion region width can be increased by…
64. minority carrier concentration depends on applied fwd voltae/applied reverse voltage/doping level/…
65. numerical on calc of drift velocity of an electron.
66. maxm power consumption occurs in electrostatic/hotwire/induction/moving iron instrument.
67. for a collector modulated AM ckt given values of L & C of the tuning ckt and the message signal freq calculate the freq spectrum of the AM wave.
68. upon which of the following plots can the Nyquist plot be mapped-bode/root locus/polar/inverse polar.
69. which of the following compensators increases the damping factor-phase lead/phase lag/phase lag-lead/phase lead-lag.
70. for regenerative feedback having fwd path gain G(s) and f/b path gain H(s) calc the transfer function.
71. which is true about the wagner earthing device-it reduces waveform errors/introduces high accuracy in measurement/does not affect AC bridges/changes the freq of measurement.
72.  a 2nd order LTI system acts as which of the following-HPF/LPF/BPF/..
73. which of the following adds linearly-Ls in series/Cs in series/Rs in parallel/..
74. relation between mobility and diffusion constant.
75. at 308K value of Eg for Si.
76. what indicates the efficiency of transport of electrons injected from the emitter into the collector by the base-base transport factor/base injection factor/…
77. error detection can be achieved by potentiometer/amplidyne/armature controlled/field controlled AC motor.
78. which of the following can act as an input to an AC bridge-RPS/oscillator/amplifier/…
79. if some i/p voltages are to be added without changing their values in an op-amp having f/b resistance as 1k, the i/p resistances should be..

80. given ?,l and d for a copper wire,calc its resistance.
81. if the length of a wire is increased what happens to its resistance-increases linearly/increases exponentially/…
82. for a current carrying coil if the current is doubled then the field strength is doubled/halved/increased 4 times/..
83. some value of L and C is connected to a 150V,60Hz source. What value of inductor will make the same current lag behind the same voltage with the same capacitor.
84. loss due to dielectric distortion ina capacitor is called…
85. for an ideal MOS capacitor if the gate voltage is less than 0 it behaves in what mode..
86. given a ckt with a parallel combination of a 1 F capacitor and a (1O resistor and 0.5H inductor in series) excited by a source of value cos t, calc the current given by the source.
87. anti-side tone ckts are used in telephones to introduce/eliminate/attenuate sidebands.
88. in a radio receiver noise occurs in the mixer/oscillator/amplifier/… stages.
89. for a 4k RAM with starting address 4000H the last address will be…
90. RST 5.5 is vectored to which address
91. among RST 5.5/6.5/7.5 which is serviced last.
92. a capacitor of some value is charged thru a resistor of some value and a 6 V battery. Calc the time taken by the capacitor to charge to its maxm value.
93. given an eqn for FM, identify the carrier freq.
94. how many invalid states are present in a mod-6 counter.
95. when ckts are connected in tandem which method is easier to analyze them-h parameters/OC impedance parameters/transmission parameters/SC admittance parameters.
96. from a 75 MHz counter what is the value of the smallest time period of the signal that can be obtained.
97. Cgd for a FET in the small signal low freq model is in the range of…
98. kirchoff’s law is not applicable to which of the following ckts-nonlinear/dual/linear/distributed parameter.
99. why is a diac preferred to turn on a triac-for slower turn-on/faster turn-off/better stability/…
100. resistance of the epitaxial layer depends on…
101. which of these is an active transducer-photoconductive/photovoltaic cell/selsyn/…
102. DC blocking in a transistor is achieved by…..
103. what current is drawn by a 10 W lamp connected to a 220 V,60 Hz source.
104. noise margin of CMOS is 0/infinite/high/medium…
105. schotky barriers are frequently used as…..
106. octave freq range is represented by….
107. i/p impedance of a digital instrument is of the order of….
108. what is the time taken to multiply a 14 bit no. with a 1 MHz clock.
109. parity error checking identifies error occurring in 1 bit/2/3/4 bits only.
110. when RESET IN(active low) is affected in an 8085 what happens.
111. how many times will a for loop going from 20 to 100 in steps of 10 be executed.
112. if the control statement is made outside the body of a function in C what is it called.
113. which of the following can be a variable in C-8ab/total salary/gross_salary_2008/net__income__2008.
114. if the units of both current and voltage are increased 20 times of their present value how will the units of capacitance change.

115. what type of non-linearity is present in a servomotor-backlash/coulomb friction/dead space/…
116. given the i/p signals to a differential amplifier calc its o/p voltage.



Aptitude:

There were 36 questions in this section, about 12 questions each in verbal,quant and GK. some of the GK questions were:



Author of “the great Indian story”.

Author of ”making globalization work”.

Captain of the 2006 world cup winning  italian football team.

Full form of the acronym CITES.

Period of the fourth five-year plan.

In which year did the turks conquer Constantinople .
GENERAL AWARENESS
1)”INDIA is beautiful” who space scientist tell this words
a) sunitha Williams b) A.P.J abdul kalam
2)which country has minimum WAGE LAW?
3) which JAMES BOND film officially released in china?
a) die another day b) tomorrow never dies
c) casino rayol d)…
4)which country foreign revinue was $trillions?
5)if gain =50..it is in dB’s
6)Demultipexer has
a)multiple i/p’s &o/p’s b)one i/p & multiple o/p’s
c) multiple i/p’s &one o/p’s d)one i/p&one o/p
7)half adder has…
Ans isX-OR & AND gate
8)which device is used for storage of binary numbers
a)Registers b)latch
c)flipflop d)..
ans is a;
9)giving one N/W theorem statement and which N/W theorem it is?
10)problem on star to Delta conversion from N/W theory?
11)3-4 problems on K-map find out the expression? (sum or product)
12)Vgs=1v,FET voltage =4v then what is Vds?
13)adc=0.98, Ie=2mA find Ib&Ic?
14)which one is digital modulation?
a)pcm b)ppm
c)pwm d)pfm
15)integrated MOSFET is used for…compare to BJT?
16)which flip flop is called as Latch?
17)given Transmitted power, modulation index.. find out carrier power?
18)Y(s)=G(s)u(s)…in this G(s) is called as…
19)laplace transform of Differentiation?
20)F=(AB+X’Y) then F’=?
a)(AB)’+(X’Y)’ b)(A+B)(X’+Y’)
c)…. D)(AB+X’Y)’
21)
A
1 1
C 1 1 D
B
a) B b)A c) C d)none
22)page memory is
a)256 bits b)255 bits
c)256 bytes d)255 bytes
23)WAP is provided by
a)WWW B).....
it is from cellular mobile application
24)H.L.R means from cellular mobile application…
25)At high frequency which noise is generated?
a)shot noise b)impulse noise
26)problem on PINCHOFF VOLATAGE…
27)problem on Range and frequency from RADAR?
28)which IC is used for X-OR gate operation?
29)MODULATION is need for…
30)what is tree?
a)joining of 2 nodes b) joining of 2 branches
c) joining of 2 loops d)….
31problem on CRAMMERS RULE find the values of X,Y,Z? given 3 equatoions?
32) I1 I2 I3 I4 I5 I6
x +1 -1 0 1 0 0
Y +1 0 -1 0 1 0
Z 0 +1 -1 0 0 1
find out branch currents?
I1=X+Y; I2=-X+Z; I3=-Y-Z; I4=?; I5=?; I6=?
mostly they are given questions from these subjects
1.dc mechines(about 50)
2.Networks(20)
3.instruments(5)
4.digital electronics(30)
5.EDC & analog electronics (8)
6.control systems(2)
7.antenas,satillite commincation(5)
8.communications(10)
the paper is very hard i dont expect they will give question patern like this so plz concentrate more on mechines
some of questions i feel easy and i remember are
1.what is weight of 5rupee coin??
2.who is below never a cheif justice of india ?
3.what is largest ISRO company in india?
4.who is player took 10 wikts in one test innings ?
(in the list anil kumble not given)

techinical que's:
1.binary number for 1001.1101?
2.decimal number for 19?
3.excess-3 code for 29?
4.speed-torque characterictics of dc motor?
(some figures given)
5.quantization noise occurs in??(repeated question 2 times given)
6.schering brige method used for measuring of??
7.prom based on networks are very very easy every body can ans...like calculate curent in one resistor if  10 resistors are connected in parall like that
8.if speed doubles,distance increases what is the torque in dc motor?
9.what is the value of  A'+1 ?
10.what is instrument used in MIC instrument?
 a)galvonometer b)ammeter like that....
11.question about dammping concept in PMMC
12.what is PAL full form??
13.what is the use for sweeping resistor in transistor??
14.quetion based on bootstraping concept.
15.rms current in half wave rectifier?
16.what is form factor?(some ratios are given)
17.prob on tree branches concept
18.range of radio telemetry...some frequencies given
so these are questins which are very very easy and i remembered
dont feel happy to see these questions in every exam these type easy questins they will give but
who gave corect answers to difficult questions he only will select in written test.so do hard work better to learn concept clearly now a days this galgotia book also not useful for p.s.u's
prepare test books more.....


1 synchro tc and rx is

a )   two phase ac

b)    three phase ac

c)    dc only

d)    none



2 in 4 bit number one bit indicates sign of the number then the locations are from

a)      -8 to 8

b)      -7 to 7

c)      -16 to 16

d)      None



3  G(s) = 10/S(S+2) then the natural frequency of this transfer function is

a)      3.146

b)      4

c)      5

d)      2



4  In TV video amplifier is used for  =?



5) one block  contain one of the R L C element then the frequency of that one is 1 MHZ when the capacitor C= 0.1 uf is added to that block then the frequency becomes 2 MHZ then what is the element inside the block at first time

a) resistor

b) inductor

c) capacitor with 0.5 uf

d) none of these

ans : b



6) For unit step input they gave the input G(S)= - -- - - -,h(s)= -------then he ask the steady state error for that transfer fn



7)Avalanche photo diode is used when compared to PIN diode bcz

 a) larger band width      C)-------

 b) high sensitivity          d) --------



8)  some non zero DC voltage is      to RC low pass circuit then the DC voltage in the output contains

a)      Same as in input

b)      Higher than  input

c)      Zero

d)      Slightly increases


9) ifthe output of the gate is always high then the gates applied to this logic are

a)      NAND and EXOR

b)      Nand and NOR

c)      AND and XNOR

d)      OR and XOR

Ans ) a


10) For the voltage series feedback he gave input resistance and A  and beta value then find the output resistance ?

 11)Signal to noise ratio =15 db Bandwidth =4KHZ then the channel capacity -?

Ans :                C= B Log (1+ s/n)   =16 log 2


12 ) Four  messages are given like this 0.5,0.25,0.125,0.125 ,entrophy value is =?

Ans:          Entrophy= Avg of all informations



13) Thermal Run away is not possible in FET bcz the flow of

a)      minority careers        c) _____

b)      Transconductance      d) none

Ans : FET is unipolar so there are no minority careers .Thermal run away occurs only minority careers



14)Gm= 10 ,Rd =20k,Rl =10 find the amplification factor -=?

Ans =  U= Gm Rd



15)  Two ideal voltage sourd=ces resistors are connected in series ,power of that one is 4W ,If one of the sorce is active other resistors are shorted .Calculate the power when both are active +/

a)      0W,8W

b)      8W,6W

c)      4W,0W

d)      None



16)   A TV braod cast tx uses which type of antenna =?

a) parabolic antenna b)=---

c)-----   d) -----

ans : a



17)   Electric field and equi potential lines are

a) parallel to each other

b) In Quadrature

ans : b


18 ) L1= ----- , L2 =  ---- k= _---- then mutual inductance of the coil is =?

Ans :    M=ksquare root of L!and L2

19 ) one cube some is there to find out the how many number of cubes are having single side ?


20)Two qs in verbal are ----- two statements are given for that the relation btwn those two

Totally there are 160 qs out of that 100 qs from technical and 60 qs from aptitudeand verbal


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