Papers with Answers for HAL

Please provide me technical question paper for Hindustan Aeronautics Limited examination in a PDF file format ?

[Quick Sam]

Here I am giving you technical question paper for Hindustan Aeronautics Limited examination.
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 laglead/
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.

1) What is the distance between the EHV lines?
a)8m b)11m c)4m d)14m
2) At present how many HVDC lines are there in india?
a)none b)one c)two d)more than two
3) Where is the nuclear located in following places?
ans: i dont remember the answers, but one of them is thalcher(orissa)
4) What is the approximate peak overshoot for a unity feedback system with damping factor 0.6?
a)10% b)5% c)15% d)20%
5) What is the distance between the EHV lines and earth?
a)8m b)11m c)18m d)15m
6) On no load in EHV lines what is the relation between receinving and sending end voltage?
ans: receiving end voltage > sending end voltage
7) What is the surge impedance loading of 400kv line?
ans: 4002/400ohms =400watts
8) similar question with surge impedance given as 160 ohms
ans: 1000watts
9) If both the juctions of transistor are forward biased, in wat region transistor works
ans: saturation region
10) Where is the hydel power plant located in following places?
ans: I dont remember the places
11) self GMD is used in the calculation of_______
a) inductance only
b) inductance and capacitance
c) capacitance only
d) none
12) What is the GMD if the distance between the lines are 6m,6m,12m?
ans: 7.058m( approx)
13) Zero sequence currents doesn't exist in the following fault
a) L-G
b) L-L
c) L-L-G
d) L-L-L-G
Ans: d
14) To avoid arcing connect sutable value of ________ in earthing.
a) capacitance
b) indunctance
c) resistance
d) susceptance
15)There are two to three questions based on Laplace and Inverse Laplace transforms
16)In the following type of conductors the corona is minimum
a) circular
b) stranded
c) helical
d) rectamgular
ans: c
17)When do two wattmeters show same value of opposite readings in two wattmeter method
a) 300 lag
b) 600 lag
c) between 600 and 900 lag
d) zpf lag
ans: d
18) Schering bridge is used to measure
a) frequency
b) inductance
c) capacitance
d) mutual inductance
and: c
19) What is the value of resistance when both length and diameter of the wire are doubled?
ans: halved
20) There is one questions asked on euler's formula..
21) What is the Laplace transform of unit ramp signal?
ans:1/s2
22) What happens to the value of inductance when self GMD is doubled?
23) At what frequency corona loss is more?
a) 50Hz
b) 60Hz
c)
d)
24) What is the largest rating of alternator manufactured in india?
a) 1000MW
b) 500MW
c) 1200MW
d) 250MW
ans:b
25) The response of an RLC circuit for impuse input?
a) exponentially raising
b) sinusoidal
c) exponential falling
d) parabolic
ans: c
26) What is the easier method for finding no. of poles in the right half of s-plane?
a) Niquist plot
b) R-H criterion
c) Root-Locus method
d) Polor plot
ans: b
27) How many no of poles located in the right half of s-plane for the characteristic equation...
28) Burden of current transformers is measured in..
a) Watts
b) Volt Amperes
c) Ampere Hours
d) Joules
29)What is the gate used to get high output when all the inputs are low?
a) NOR
b) NAND
c) Ex-OR
d) Ex-NOR
ans: b
30) Large no of thyristors are used in HVDC transmission to improve______
a) current rating
b) voltage rating
c) Thyristers are available at high ratings
d)
31) What is the line current of a circuit when the current transformer of 1000:5 rating measures
4Amperes?
ans: 800A
32) If the time delay of relay with TMS setting 0.1 is 10 sec, then what is the time delaty when the
TMS setting is changed to 0.5
33) How many no of flip-flops are required to get 16 bit counter?
34) _________is connected to reduce frequency errors in ammeter.
a) shunt capacitor
b) series inductance
c) shunt inductance
d)
35)What is the value of ripple factor in Half Wave Rectifier?
a) 1.11
b) 0.8
c) 1.21
d)
36)The principle used in megger?
a) electrostatic effect
b) magnetic effect
c) Induction effect
d)
37)In electrodynamometer type wattmeter the error is due to..
a) pressure coil inductance
b) pressure coil resistance
c)
d)
38) In the following locations where is hydal power plant is not located?
ans: i dont remember the places
39) In distribution lines_____
a) X/R<0.1
b) X/R>10
c) X/R>1
d) X/R<0.01
40) In EHV lines _____
a) X/R=10
b) X/R=100
c)
d)
41) What is the speed of 2 pole alternator at 50Hz frequency?
ans: 3000rpm
42) What is the equivalent decimal no of (624)8
43) What is the binary equivalent of 6.25
44) What is the value of A+AB+B¯ ( B bar)
ans: 1
45) What are the avg and rms values of full wave rectifier
ans: 2Vm/pie, Vm/21/2
46) There is one question based on rank of matrix
47) What is the equivalent of cos(wt+18.750)
a) sin(wt+71.250)
b) sin(wt-71.250)
c) sin(wt+18.250)
d) sin(wt-18.250)
48) The three harmonics will be in phace with each other?_____
a) 3,5,15
b) 2,4,6
c)
d)
ans: a
49) The line current will be equal to phase current in______
ans: delta connection
50) In windmills the frequent problems occur in______
a) mechanical system
b) blades
c) electrodynamic system
d) electric system
51) The machine used in windmills is______
a) alternator
b) induction generator
c)
d)
ans: b
52) Insulators in EHV lines are designed based on_____
a) switching voltages
b) peak voltages
c) corona
d) lightning voltages
ans: a
53) The value of restriking voltage depends on______
a) inductance of line
b) capacitance of line
c) both
d) none