HAL placement paper exam questions

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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 α 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 ωτ<<1/ωτ>>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[4πn/31 + π/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 ρ,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 (1Ω
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 .

 

Some of the questions asked are given below for your
reference.
1. In which place there are No snakes?
Ireland and
also Hawai island.
2.In a class there are 35 students in which its average is 35kg, if we add ten
more students in    that class their average becomes 39kg.
What’s the average of new ten students? 53kg.
3. She swam ­___ Cauvery river ___ India and Srilanka.
Across and between     
4. How much months will be allowed for a women employee to take leave on
Maternity period? 26 weeks.
5. If  “A” sells an article to “B” in the profit of 20% and “B” sells the
same article with loss of 10% to “C” and gets rs.216. What is the cost of that
article? 200
6. 8900 is divided to the share profit to 3 persons X, Y and Z with less rs.30,
rs.20, rs.50 respectively. If the ratio is divided to 2:3:5 respectively. How
much is the share for Y?
7.Two alloys Copper and steel is in the ratio of 5:7 and 4:5 respectively. If
it melts to ________________________ in the equal ratio. Percentage?
8.Second highest Muslim population in which country?

Country	Population	Percentage of Muslims	Muslim Population
Indonesia	231,328,092	88.0%	203,568,721
Pakistan	147,663,429	97.0%	143,233,526
India	1,045,845,226	12.0%	125,501,427
Bangladesh	133,376,684	83.0%	110,702,648
Turkey	67,308,928	99.8%	67,174,310
Egypt	70,712,345	94.0%	66,469,604
Iran	66,622,704	99.0%	65,956,477
Nigeria	129,934,911	50.0%	64,967,456
Ethiopia	67,673,031	47.5%	32,144,690
Morocco	31,167,783	98.7%	30,762,602

 9.
Praveen runs 125m or 25 seconds lead in 1000m race. Though he lost with Naveen
in just a distance. How much time Praveen takes to cover the distance?
200seconds

 HAL PAPER ON 3rd NOVEMBER AT NEW DELHI

Hi good morning to all of u. I am from ELECTRICAL I am ag. on 3rd august i
attended the HAL exam. thats very very easy.Just they are concentrating on only
3 to 4 subjects. If u are red those subjects then u will be luckiest fellow.
but what i know from the exam is they are mainly concentrating on particularly
one subject i.e. DC Machines. 

On 3rd they asked three subjects i.e. DC Mchines, Networks, Measurements and
Instrumentaion.
Total Q paper contains 160 bits. out of 160

20-bits  English  -  average
20-bits  Aptitude and G.K – average
40-50 bits DC Machines – easy
20-30 bits Networks
20-30 bits M&I
5-10 bits are from trnasformer and remainning from 5 from PS 10 from
remaining Machine.

All these bits are easy but these some calculations. so please friends
whatever u know that only first u attempt in that u will get more marks.
For us this is ONLINE.

In my point of view exam was easy. I had written very well also.
now this is ur turn to prepare.
ALL THE BEST FRIENDS

Hi every body…today i gave HAL written test in hyderbad in ELECTRONICS
branch there are 145 technical questions and 15 general studies the very very
very very very important thing for those who apearing for HAL exam in
electronics is they are given most of the questions from DC MECHINES nearly 50
quetions from that subject today i was shocked to see ques’s from that
subject,so pls concentrate more on dc mechines.

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…..

HAL PAPER ON MAY 20th AT HYDERABAD
 

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