1. Expression for d(n): u(n)-u(n-1)/ u(n-1)-u(n+1)/
u(n)+u(n+1)/...
2. Numerical on a photodiode: to calculate the
responsivity/sensitivity when a specified no of incident photons cause a
specified no of electron generation.
3. For a radioactive sample which decays to 12.5% of its
initial value in x days, the half life is given by..
4. Connect two 1o resistors in series, then connect two 1h
inductors across one of the resistors such that the ckt looks like a 1o
resistor in series with a ?-section of a resistor and two inductors. With the
series resistance on the I/p side, calc the transfer function of this ckt
5. Ac signal conditioning is used for inductive and
capacitive/resistive/piezoelectric transducers/all of the above.
6. Lower useful input limit of a transducer is determined
by..
7. Air-cored inductors are used for low frequency/high
frequency/equal frequency operations.
8. Given 4 pole-zero plots identify which one corresponds to
the driving point impedance of a series resonant ckt.
9. Given four unit-circle plots identify the one
corresponding to a bandpass filter.
10. The sequence (2,3,4,3) is circularly even/circularly
odd/circularly zero/both circularly even and odd.
11. Z-transform of 3n u(n).
12. Match the following with their characteristics:
led/lcd/nixie tube/optical fibre.
13. A 4 khz signal is sampled at thrice the nyquist rate and
sent through a channel with error =1%. Calc the bandwidth of the channel.
14. Given an op-amp ckt obtain an expression for o/p
voltage.
15. No. Of encirclements made about the origin of the
nyquist plot of the open loop tf:1/[(s-1)(s+2)(s+3)].
16. Given a two port network in the form of a t find o/p
admittance in terms of y-parameters.
17. For a repeater in a pcm cable identify the correct
sequence of actions amongst threshold/equalization/etc.
18. O/p of a delta modulator when a ramp input is fed to it.
19. Steady state error with ramp I/p for a type-0 system.
20. Creeping occurs in energy meters bcoz...
21. Ultrasonic method of flow measurement cannot be used in
liquids with air bubbles/has less attenuation in air compared to
liquid-identify the false statement (if any) among these.
22. Major cause of losses in a fibre optic cable:
dispersion/total internal refraction/presence of core and cladding/..
23. Which layer in the osi model is concerned with printer
buffering, etc: network/session/transport/..
24. Given some function f(j?) calc its inverse ctft.
25. Relation between laplace and z-transform: s=z/ s=ln z/
s=( ln z/t) /..
26. Maxm and minm probability error among ask,psk,fsk,dpsk
etc
27. Which of the following is a non linear modulation
scheme: pam/qam/pcm/..
28. Match the following functions: e-t , e-t + et, sin(pt)
with causal and stable system, causal and unstable system, etc.
29. Given a ckt with a 50 o resistor in series between two
voltage sources of 10 v and 5 v magnitude calc power delivered by 5 v source.
30. Laplace transform of e-3tu(t)+e2tu(-t).
31. Which photodetector has output affected by own intrinsic
noise: pn/apd/pin/all.
32. Inverse laplace transform of 1/s2[d/ds(e-3s/s)]
33. When I mode is added to proportional control system
stability increases/ decreases/ steady state performance deteriorates/damping
increases.
34. Reset control is another name for
integral/derivative/proportional/... Control.
35. Time response of system having transfer function
625/(s2+25) will be of the form..
36. Given some transfer function calc the peak response
time.
37. The nyquist sampling rate of the function [sin(at)/t]2
will be..
38. The feedback topology that results in increased I/p and
o/p impedance is current series/voltage series/current shunt voltage shunt.
39. Numerical on cardiac output calculation given heart rate
and volume per beat.
40. In an ecg instrumentation amplifier the differential
gain is provided by 1st stage/2nd stage/mismatched resistors/output stage.
41. Repeat ques 40 above for the classic 3-op amp instrum
amplifier.
42. Emg signals are of the order of mv/v/µv/..
43. Computer assisted tomography is used for..
44. Numerical on electrostatic instrument, to calculate
deflection given spring constant, torque etc.
45. To prevent loading of a ckt I/p impedance of a cro
should bee high/low/inductive/capacitive.
46. Addition of a zero to a 2nd order underdamped system
results in increase/decrease of rise time and increase/decrease of peak
overshoot.
47. For pi ctrl we obtain improved bandwidth/improved steady
state performance/ worsened steady state performance/..
48. Snr of normal am system is comparable/3 db lower/3 db
higher/6 db lower over dsb-sc and ssb system.
49. Which is an effective measure of the noise related
performance of an amplifier: snr/noise ratio/thermal noise/shot noise.
50. Given baseband signal freq and carrier freq calc which
of the freq given will not be present for conventional am.
51. Distinction between fm and pm at high frequencies.
52. Which of these has the least propagation delay
rtl/ecl/i2l/cmos.
53 Switching speed of cmos is affected/unaffected by changes
in supply voltage.
54. Which of these provides a measure of heart rate p/qrs
complex/t/none of these.
55. Given a ckt of a logarithmic amplifier you had to
identify what ckt was it.
56. Jfet can operate in depletion/enhancement/both/none of the
above modes.
57. When a bjt operates in saturation the junctions are fwd
biased/reverse biased/..
58. Bibo stability criterion implies that poles are
within/outside/on the unit circle.
59. For faithful amplification of low amplitude signals the cut-off/active/saturation
regions of a transistor is used.
60. Lissajous pattern of a signal rotates 36 times per
minute. If the oscillator frequency is 560 khz then the unknown freq is..
61. % Resolution of a 10 bit adc.
62. To obtain 10 mv resolution on 5 v range how many bit dac
is to be used..
63. Why is lcd preferred to led.
64. How will 0.6973 be displayed on 10 v range of a 4 ½
digit multimeter.
65. Which of the following cannot be used for an automatic
feedback temp ctrl system thermocouple/thermometer/thermistor/ic sensor.
66. Y(n)=x(-n+3) is an example of a linear/non linear and
shift variant/invariant system.
67. The falling body method is used to determine
viscosity/humidity/...
68. Which of these methods of viscosity measurement gives
greatest accuracy falling body method/rotating cylinder method/both/..
69. Some question on gas chromatography
70.A device having a rotor with 3 y-connected coils and a
stator is likely to be a synchro/rvdt/control transformer/..
71. In a twisted ring counter the initial count is 1000.
After the 4th clock pulse its state will be...
72. A 240 khz signal is given into a 3 bit binary ripple
counter. The lowest o/p freq obtainable is...
73. For parity bit checking which of the following gates can
be used xor/nand/or/xnor.
74. Why is a bjt called so..
75. Identify the expression for gauge factor of a strain
gauge among the given options.
76. In a semiconductor strain gauge as tensile strain is
applied what changes take place in the n and p areas..
77. How does a radioactive level gauging system work..
78. A capacitive transducer measuring level works on the
principle of change in distance between plates/change in dielectric strength/..
79. For maximum power transfer in an ac circuit the
condition to be satisfied is zl+zs=0/xl+xs=0/none of these/...where l and s
refers to load and source resp.
80. Find the transfer function from a block diagram.
81. Synchronous ctrs are preferred to asynchronous ctrs bcoz they are faster/glitches at the
output can be avoided/both/none of these.
82. The lissajous figure formed on an oscilloscope looks
like the english figure of 8. If the vertical channel input is 1 khz the
horizontal input freq is...
83. Ie=ic for a transistor in saturation/cutoff/active/both
saturation and active regions.
84. Reproducibility of measurements is called
accuracy/precision/linearity/none of these.
85. Which of these is not strictly a static characteristic
accuracy/precision/tolerance/linearity.
86. The shunt coil in a q meter has resistance of the order
of mo/o/ko/..
87. For measuring inductance of high q coils the bridge used is
maxwell-wien/schering/..
88. Which of these measures inductance in terms of
capacitance maxwell and hay/maxwell and schering/hay and schering/..
89. In a flip-flop with preset and clear inputs both are
applied simultaneously/clear is cleared when preset is applied/preset is
cleared when clear is applied/...
90. What happens when the ret instruction is encountered by
8085
91. A 1024*8 memory chip needs how many address lines..
92. What happens when the push instruction is encountered by
8051.
93. In fm relation between no of sidebands w.r.t. Modulating
freq
94. Numerical on dpsk.
95. A multiplexer accepts input data and provides one output
all the time/one output at a time/many outputs at a time/many outputs all the
time.
96. Pulse modulation is essentially a process of
multiplexing/...
97. Wave shape is altered by clipper/clamper/voltage
doubler/amplifier.
98. 4 Signals of frequencies 100,100,200 and 400 hz are
sampled at nyquist rate and sent through tdm on a channel.the bandwidth of the
channel is..
99. Superposition can be applied to a ckt with initial
conditions/non-linear ckt/..
100. Kelvin's double bridge is used for the measurement of..
101. Which of these is not an active transducer
thermocouple/solar cell/rtd/none of these.
102. Oscillator using positive feedback has gain of
0/8/undefined value/..
103. Wien bridge oscillator should initially have closed
loop gain >3/<3/=3/..
104. Some question on gain margin and phase shift of a
system.
105. Fourier series expansion of even function has sine
terms only/cosine terms only/no odd harmonics/..
106. Full wave rectifier gives clean dc o/p/dc o/p with
small ripple/positive half and inverted negative half of I/p as o/p.
107. Which of these values of ? Gives damped oscillations:
0/1/1.6/0.6
108. For a transformer of ratio 1:a and excited by a source
v with impedances z1 and z2 on the primary and secondary side value of a for
maxm power transfer should be..
109. Fourier transform of cos(?0t) is..
110. At t=0 the step response of a 1st order system is...
111. 555 Can be used as a monostable/astable/freq dividing
ckt/all of these.
112. In a pt when the secondary is open ckted with the
primary excited what will happen.
113. If a system is marginally stable then the nature of
oscillations will be..
114. Linear encoders mostly use straight binary/bcd/gray
code.
115. For an accelerometer working in displacement mode the
ratio of forcing freq to natural freq should b
