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01. The threshold effect in demodulators is
(a) The rapid fall of output SNR when the input SNR falls below a particular value
(b) Exhibited by all the demodulators when the input SNR is low
(c) Exhibited by all AM suppressed carrier coherent demodulators
(d) Exhibited by correlation receivers
Ans: (a)
02. An amplitude modulated signal is
[A+ 0.5 A cos COm t] cos COct where COm and COc are respectively, modulating and carrier
frequencies. The power efficiency is
(a)11.11% (b)0.25% (c)4.32% (d)50%
Ans: (a)
03. The signal x(t) = sin(200 nt)+2 sin(400nt) is modulated to produce a signal
g(t) = x(t) sin ( 400 nt).
This is passed through a low pass filter having a cut-off frequency of 400nHz and pass
band gain of 2. Then the output signal after the filter is
(a) 0 (b) 0.5 sin (200m) (c) sin(200nt) (d) 2 sin(200m)
Ans: (b)
04. In communication systems, noise due to quantization error is
(a) Linear and signal dependent
(b) Non-linear and signal dependent
(c) Linear and signal independent at low frequencies only
(d) non-linear and signal dependent at low frequencies only
Ans: (a)
05. Match List I with List II and select the correct answer using the code given below the
lists:
List I
A Characteristic impedance
B. Poynting vector
C. Displacement current
D. Point form of Gauss law
Codes
A B c
(a) 2 3 4
(b) 1 3 4
(c) 2 4 3
(d) 1 4 3
Ans: (a)
List II
1. V. D = Pv
JCO ll 2. (a+ jcoE)
3.ExH
4. aD
at
2

06. For an earth station transmitter, with an antenna output power of 40dBW (10,000W), a
back-off loss of 3dB, a total branching and feeder loss of 3dB, a total branching and
feeder loss of 3dB and transmit antenna gain of 4dB, the effective isotropic radiated
power (EIRP) will be
(a) 38dBW (b) 40 dBW (c) 36 dBW (d) 47 dBW
Ans: (a)
07. A coherent binary phase-shift-keyed (BPSK) transmitter operates at a bit rate of
20Mbps. For a probability of error P(e) of 10-4 and given carrier-to-noise (C/N) density
ratio of 8.8 dB, determine energy of bit-to noise (Eb/No) density ratio for a receiver
bandwidth equal to the minimum double-sided Nyquist bandwidth.
(a) 23 dB (b) 2.3 dB (c) 8.8 dB (d) 0.88dB
Ans: (c)
08. An elliptically (arbitrarily) polarized wave can be broken up into
(a) Two circularly polarized components rotating in same direction
(b) Two circularly polarized components rotating in opposite directions
(c) Two stationary circularly polarized components
(d) None of these
Ans: (b)
09. Klystron operation is based on the principle of
(a) Velocity modulation (b) Amplitude modulation
(c) frequency modulation (d) Phase modulation
Ans: (a)
10. The following is not an application ofvaractor diode:
(a) Parametric amplifier (b) Frequency tuner
(c) Voltage controlled oscillator (d) Phase shifter
Ans: (d)
11. The following quantity is not required in the calculation of Q of a cavity resonator
(a) Energy stored (b) Power dissipated
(c) Loss in radiation (d) Dimensions of the cavity
Ans: (c)
12. When electromagnetic waves are propagated in a waveguide
(a) They travel along the walls of the waveguide
(b) They travel through the dielectric without touching the walls
(c) They are reflected from the walls but do not travel along the walls
(d) None of these
Ans: (b)
13. Slotted line with tunable probe is not used to measure
(a) VSWR (b) Wavelength (c) Power(d) Impedance

Ans: (c)

14. In a microwave magic-T, E plane and H plane are
(a) In phase (b) Out of phase (c) Isolated (d) 90° out of phase
Ans: (c)
15. Baratters and bolometers are used for measurement of
(a) VSWER (b) Transmission losses
(c) Microwave power (d) Frequency
Ans: (c)
16. Magnetic properties offerrites result mainly from
(a) Polarization of electromagnetic waves
(b) Dielectric behaviour of ferrite
(c) Magnetic dipole moment associated with the electron spin
(d) External magnetic fields
Ans: (c)
17. A communication link is to be set up better two stations 100km as part using 'A antenna
2
to transmit 1kW power. The operating frequency is 100 MHz and the directivity of the
two antennae is 1.64. The maximum received power would be
(a) 3.06 x 10-8W (b) 1.53x 10-8 W (c) 6.12x10-9W (d) 1 x 10-9W
Ans: (b)
18. In the ionosphere layer, the lowest frequency signal that penetrates the layer upon
vertical incidence is given by
(a)fL=81 NMax (b)fL=81N2Max (c) fL =~81NMax (d) fL =81~NMax
Ans: (c)
19. An 8085 microprocessor executes the following instructions:
Two numbers are represented in signed 2's complement form as
P = 11101101 and Q = 11100110
IfQ is subtracted from P, the value obtained in signed 2's complement form is
(a) 100000111 (b) 00000111 (c) 11111001 (d) 011111001
Ans: (b)
20. If (11X1 Y)8 = (12C9)16 then the values X andY are
(a) 5 and 1 (b) 5 and 7 (c) 7 and 5
No Answer (The correct answer is X= 3, Y = 1)
21. A mall code of 8085 as given below, is executed
MVIA, 7FH
ORAA
CPIA2H
The contents of the accumulator and flags after execution are
(d) 1 and 5
(a) A = DD S = 1 Z = 0 CY = 0 (b) A= 7F S = 1 Z = 0 CY = 1
' ' ' ' ' '
(c) A = DD S=O Z= 1 CY =0 (d) A= 7F S = 0 Z = 1 CY = 1
' ' ' ' ' '
Ans: (b)

22. Following program finds absolute value ofN:
MVIA,N
ORAA
JMONE
OUT 01H
HLT
ONE: (P)
(Q)
OUT 01H
HLT
The instructions of (P) and (Q) must be
(a) CMA and ADI OH (b) CMC and ADI OH
(c) INR A and CMC (d) INR A and CMA
Ans: (a)
23. An Intel 8085 processor is executing the program given below:
MVIA, 10H
MVIB, 10H
BACK:NOP
ADDB
RLC
JNCBACK
HLT
The number of times that the operation NOP will be executed as
(a)1 (b)2 (c)3 (d)4
Ans: (c)
24. Match List I with List II and select the correct answer using the code given below the
lists :
List I
A Immediate
B. Implicit addressing
C. Register addressing
D. Direct addressing
Codes:
A B
(a) 3 4
(b) 1 4
(c) 3 2
(d) 1 2
Ans: (a)
List II
1. LDA30FF
2.MOV A,B
3. LXI H, 2050
4.RRC
25. The Boolean equation X= [(A+ B XB + C) ]B can be simplified to
(a) X=AB (b) X=AB (c) X=AB (d) X=AB
Ans: (c)

26. For 8086 microprocessor, the jump distance in bytes for short jump range is
(a) Forward 255 and Backward 256 (b) Forward 127 and Backward 128
(c) Forward 31 and Backward 32 (d) Forward 15 and Backward 16
Ans: (b)
27. The action performed by the following instruction of 8086:
mov [ 1234h], AX
(a) Move contents of memory location 1234h to register AX
(b) Move the contents of register AX to memory offset 1234h
(c) Add contents at 1234h and AX
(d) Add contents of 1234h and AX and store the result in 1234h
Ans: (b)
28. While executing a program, 8085 microprocessor completes fetching of instruction JMP
2050 stored at address 2057H. The contents of the program counter after fetching the
instruction would be
(a)2050H (b)2057H (c)205AH (d)2051H
Ans: (c)
29. For Opcode fetch operation in 8085 microprocessor
(a) S1 = 0, S2 = 1RD = O,ALEhighin T1 (b) S1 = 1, S2 = 1RD = 0, ALE high in T1
(c) S1 =1,S 2 =1,RD=O, ALEhighinT2
Ans: (b)
(d) S1 =0S2 =1RD=O,ALEhighinT2
30. In a microprocessor, the service routine for a certain interrupt starts from a fixed
location of memory which cannot be externally set, but the interrupt can be delayed or
rejected. Such an interrupt is
(a) Non- maskable and non-vectored
(c) Non-maskable and vectored
Ans: (d)
31. A memory system has a total of 8 memory
lines. The size of the memory system is
(a) 16k bytes (b) 32k bytes
Ans: (a)
(b) Maskable and non-vectored
(d) Maskable and vectored
chips, each with 12 address lines and 4 data
(c) 48 k bytes (d) 64k bytes
32. Consider the following statements for a DRAM:
1. Bit is stored as a charge.
2. It is made ofMOS transistors.
3. Speed of DRAM is faster than processors.
4. Each memory cell requires six transistors
Which of these statements are correct
(a) 1 and 2 only (b) 2 and 3 only (c) 3 and 4 only (d) 1,2,3 and 4

Ans: (a)

33. The access time of a cache memory is lOOns and that of main memory is 1 ms.80% of
the memory requests are for read and others are for write. Hit ratio for read only
accesses is 0.9. A write through procedure is used. The average access time of the
system for both read and write requests is
(a) 200 ns (b) 360 ns (c) 720 ns (d) llOOns
Ans: (b)
34. A virtual memory system has an address space of 8k words, a memory space of 4k
words and page and block sizes of lk words. The number of page faults using of lk
words. The number of page faults using LRU policy, for following page references is
10246215700
(a) 5 (b) 7 (c) 9 (d) 10
Ans: (a)
35. Among memory types, the abbreviation MPDRAM stands for
(a) Multi port Dynamic Random Access Memory
(b) Multipoint Dynamic Random Access Memory
(c) Multipoint Disk Random Access memory
(d) Multi port Dimensional Random Access memory
Ans: (a)
36. The following register holds the instruction before it goes to the decoder:
(a) Control register (b) Accumulator (c) Address register (d) Data register
Ans: (d)
37. The incorrect match (when n > 1) is
(a) SISD Model of computer
(b) SIMD Model of computer
(c) MISD Model of computer
(d) MIMD model of computer
Ans: (d)
1 control unit and 1 ALU
1 control unit and n ALUs
n control units and n ALUs
n control units and 1 ALU
38. In case the code is position dependent, the most suitable addressing mode is
(a) Direct mode (b) Indirect mode (c) Relative mode (d) Indexed mode
Ans: (c)
39. The data structure needed to convert infix notation to prefix notation is
(a) Queue (b) Stack (c) Tree (d) Graph
Ans: (b)
40. A binary tree Than leaf nodes. The number of nodes of degree 2 inTis
(a)log2n (b)n-1 (c)n (d)2n
Ans: (b)
41. In locations where the humidity is low, ICs based on one of the following technologies
should be handled only after grounding the body. The technology is
(a) TTL (b) CMOS (c) DTL (d) I2L
Ans: (b)

42. If a feedback control system has its open-loop transfer function
G(s)H(s)= [s(s + 2)(s~ +
2
s + s)J the coordinates ofthe centroid ofthe asymptotes of its
root-locus are
(a) -1 and 0 (b) 1 and 0 (c) 0 and -1 (d) 0 and 1
Ans: (a)
43. Match List I with List II and select the correct answer using the code given below the
lists:
List I
A.HTL
B. COMOS
C. I2L
D.ECL
Code:
(a)
(b)
(c)
(d)
Ans: (c)

List II
1. High fan-out
2. Highest speed of operation
3. High noise immunity
4. Lowest product power and delay
c D
1 2
1 3
4 2
4 3
44. The figure of merit of a logic family is given by
(a) Gain bandwidth product
(b) (Propagation delay time) x (Power dissipation)
(c) (Fan-out)x (Propagation delay time)
(d) (Noise -margin) x (Power dissipation)
Ans: (b)
45. The correct expression is
(a) AB + AB = AB(A +B)
(c) AB + AB = AB(A + B)
Ans: (a)
(b) AB + AB = AB(A + B)
(d) AB+AB=AB(A+1)
46. Binary data is being represented in size of byte and in 2's complement form. The
number of 0' s present in representation of ( -127)DECIMAL IS
(a)8 (b)7 (c)6 (d)5
Ans: (c)
47. Simplified form of the logic expression
(A + B + C XA + B + C XA + B + C )s
- - -
(a) AB + C (b) A+ BC (c) A
Ans: (b)

48. For a transistor used as a switch, tct is delay time, tr is rise time, ts is storage time and tr is
fall time. Then turn-on time toN and turn-off time toFF are respectively
(a) (tct + ts) and (tr + tr) (b) (tct + tr) and (ts + tr)
(c) (tr + ts) and (tct + tr) (d) (tct + tr) and (ts + tr)
Ans: (d)
49. In the circuit shown, the need of the resistor Rp is
(a) To increase the overall gain
(b) To stabilize the circuit
(c) To increase input impedance
(d) To prevent saturation
Ans: (b)
v 1
50. A 40V de supply is connected across the network comprising of zener and silicon diode
as shown. The regulated voltages V01 , V02 and source current Is are
(a) 2.4V, 5.1 V and 21.7mA
(b) 3V,6V and 22.7mA
(c) 3.3V, 9.3V and 20.5mA
(d) 4V, 10V and 20mA
Ans: (c)
1.5K
I,
40V ..=.
51. For a full wave rectifier , with sinusoidal input and inductor as filter, ripple factor for
maximum load current and minimum load current conditions are respectively
(a) 0.1 and 1 (b) 0.1 and 0.47 (c) 0 and 0.47 (d) 0 and 0.22
Ans: (c)
52. The second-harmonic component in the output of a transistor amplifier, without
feedback, is B2. The second harmonic component, with negative feedback B2 is equal to
(where A= Amplifier gain and ~ = feedback factor)
(a) B2 (b) B2 (1 +A~) (c)~
1+A~ ~
Ans: (a)
(d)~
A~
53. The lower 3dB frequency of ann-stage amplifier with non-interacting stages is given by
(a) fL (b) fL[~2~ -1: (c) fL (d) fL[~2~ -n:
~2~-1 ~2~-n
Where fL is the 3dB frequency of a single stage.
Ans: (a)
54. An output signal of a power amplifier has amplitudes of 2.5V fundamental, 0.25V
second harmonic and 0.1 V third harmonics. The total percentage harmonic distortion of
the signal is
(a) 12.8% (b) 10.8% (c) 6.4% (d) 1.4%
Ans: (c)
55. A change in the value of the emitter resistance Rein a differential amplifier
(a) Affects the difference mode gain, Act
(b) Affects the common mode gain, Ac
(c) Affects both Act and Ac
(d) Does not affect either Act or Ac
Ans: (b)
56. In a transistor biased in the active region, thermal runway is due to
(a) Base emitter voltage VBE which decreases with rise in temperature
(b) Change in reverse collector saturation current due to rise in temperature
(c) Heating the transistor
(d) Changes in ~ which increases with temperature
Ans: (b)
57. A transistor is said to be useful to be configured as an amplifier when its ~is
(a) less than 0 (b) Between 0 and 1 (c) Between 1 and 50 (d)> 50
Ans: (d)
58. A BJT is biased with a power supply of 12V. For minimum heat dissipation, the drop
across the transistor will be
(a)6V (b)9V (c)12V (d)>9Vbut<12V
Ans: (a)
59. A bipolar junction transistor with forward current transfer ratio a= 0.98, when working
in CE mode, provides current transfer ratio ~ as
(a) 98 (b) 0.02 (c) 49 (d) 0.49
Ans: (c)
60. Match List I with List II and select the correct answer using the code given below the
lists:
List I
A Tuned circuits
B. Voltage reference
C. High frequency switch
D. Current controlled attenuator
Code:
A B c D
(a) 2 4 1 3
(b) 3 4 1 2
(c) 2 1 4 3
(d) 3 1 4 2
Ans: (a)
List II
1. Schottky diode
2. Varactor diode
3. PIN diode
4. Zener diode

61. Assuming that only logic inputs X and Y are available and their complements
X andY are not available, the minimum number of two-input NAND gates required to
implement X EB Y would be
(a)2 (b)3 (c)4 (d)5
Ans: (c)
62. The minimum number of NAND gates required to implement A + AB + ABC is equal
to
(a)Zero (b)l (c)4 (d)7
Ans: (a)
63. The type of device used to interface a parallel data format with external equipment's
serial format is
(a) Key matrix (b) UART (c) Memory chip (d) Serial-in, parallel-out
Ans: (b)
64. A bistable multi-vibrator that functions as a voltage comparator with hysteresis is called
(a) T flip-flop (b) D flip-flop (c) J-K flip-flop (d) Schmitt trigger
Ans: (d)
65 The characteristic equation of the T lfip-flop is given by
(a) Qn+l = TQn (b) Qn+l = TQn + Qn T
- -
(c) Qn + 1 = TQn (d) Qn+l = TQn
Ans: (b)
66. A pulse train with a frequency of lMHz is counted using a mod-1024 ripple counter
built with J -K flip-flops. For proper operation of the counter the maximum permissible
propagation delay per flip-flop stage is
(a) lOOns (b) 50 ns (c) 20 ns (d) IOns
Ans: (a)
67. The highest speed counter is
(a) Asynchronous counter
(c) Ripple counter
Ans: (b)
(b) Synchronous counter
(d) Ring counter
68. An analog voltage of 3.41 V is converted into 8-bit digital form by an AID converter
with a reference voltage of 5V. The digital output is
(a) 1001 1001 (b) 1111 0001 (c) 1011 0111 (d) 1010 1110
Ans: (d)

69. Match list I with List Ii aqnd select the correct answer using the code given below the
lists:
List I List II
A 555 1. Microcontroller
B. 74173 2. Register
C. 74163 3. Timer
D. 8097 4. Counter
Code:
A B C D
(a) 3 4 2 1
(b) 1 4 2 3
(c) 3 2 4 1
(d) 1 2 4 3
Ans: (c)
70. In which of the following type of AID converter does the conversion time almost
double for every bit added to the device?
(a) Counter type AID converter
(b) Tracking type AID converter
(c) Single-slope integrating type AID converter
(d) Successive approximation type AID converter
Ans: (a)
71. If both inputs of S-R NAND latch are low, the output will be
(a) Unpredictable (b) Toggle (c) Reset (d) Remain same
Ans: (a)
72. A 10-bit DAC provides an analog output which has a maximum value of 10.23 volts.
Resolution of the DAC is
(a) 10 mV (b) 15 mV (c) 20 mV (d) 40 mV
Ans: (a)
73. Consider the following statements regarding registers and latches:
1. Registers are temporary storage devices, whereas latches are not.
2. A latch employs cross-coupled feedback connections.
3. A register stores a binary word, whereas a latch does not.
The correct statement(s) is/are
(a) 1 only (b) 2 only (c) 1 and 3 (d)2and3
Ans: (d)

74. Match List I with List II and select the correct answer using the code given below the
lists:
List I List II
A Flash converter ADC 1. Integrating type
B. Successive approximation ADC 2. Fast conversion
C. Counter ramp ADC 3. Maximum conversion clock periods =
Number of bits
D. Dual slope ADC 4. Uses a DAC in its feedback path
Codes:
A B c D
(a) 2 3 4 1
(b) 1 3 4 2
(c) 2 4 3 1
(d) 1 4 3 2
Ans: (a)
75. A 12-bit ADC is operating with a 1 !J.S clock period and total conversion time is seen to
be 14 !J.S. The ADC must be of
(a) Flash type (b) Counting type
(c) Integrating type (d) Successive approximately type
Ans: (a)
76. The type of system which is used for determination of static error constants IS
determined from the number of
(a) Zeros at origin for open loop transfer function
(b) Poles at origin for open loop transfer function
(c) Zeros at origin for closed loop transfer function
(d) Poles at origin for closed loop transfer function
Ans: (b)
77. The time taken for the output to settle within ± 2% of step input for the control system
db 25 . . b represente y 2
IS given y
s + 5s + 25
(a) 1.2 s
Ans: (b)
(b) 1.6 s (c) 2.0 s (d) 0.4 s
78. The following quantities give a measure of the transient characteristics of a control
system, when subjected to unit step excitation:
1. Maximum overshoot 2. Maximum undershoot
3. Overall gain 4. Delay time
5. Rise time 6. Fall time
(a)1,3and5 (b)2,4and5 (c)2,4and6 (d)1,4and5
Ans: (d)

79. In a feedback control system, if
G(s) =
4
and H(s) = .!.., then the closed-loop system will be of type
s(s+3) s
(a) 3
Ans: (d)
(b) 2 (c) 1 (d) 0
80. For a second order dynamic system, if the damping ratio is 1 then the poles are
(a) Imaginary and complex conjugate (b) In the right-half of s-plane
(c) Equal, negative and real (d) Negative and real
Ans: (c)
81. The spectral density and autocorrelation function of white noise is
(a) Delta and uniform (b) Uniform and delta
(c) Gaussian and uniform (d) Gaussian and delta
Ans: (b)
82. The average information associated with an extremely likely message is zero. What is
the average information associated with an extremely unlikely message?
(a) Zero
(b) Infinity
(c) Depends on total number of messages
(d) Depends on speed of transmission of the message
Ans: (b)
83. The effect of integral controller on the steady state error ( ess) and on the relative stability
(Rs) of the system are
(a) Both are increased
(c) ess is reduced but Rs is increased
Ans: (d)
(b) ess is increased but Rs is reduced
(d) Both are reduced
84. A proportional integral (PI) controller results in which of the following?
(a) Improves the transient response without affecting steady state response
(b) Improves the steady state response without affecting transient response
(c) Improves both transient response and steady state response
(d) Improves the steady state response while marginally affecting transient response, for
well designed control parameters
Ans: (d)
85. A liquid level controller linearly converts a displacement of 2 m to 3 m into 4-20 rnA
control signal. A relay serves as two position controller to open and close an inlet valve.
Relay closes at 12 rnA and opens at 10 rnA The hysteresis zone is
(a) 0.1 m (b) 0.125 m (c) 0.15 m (d) 0.2 m
Ans: (c)
86. The necessary conditions for poles and zeros of the transfer function of a bridge-T
network containing only resistors and capacitors and used as a compensator are
(a) All the poles and zeros must be imaginary
(b) Poles and zeros both can be complex
(c) Poles can be complex but zeros must be real
(d) Zeros can be complex but poles must be real
Ans: (d)

87. Considering the filtering property, the lead compensators and lag compensators are
categorized respectively as
(a) Low pass and high pass filters
(c) High pass and high pass filters
(b) High pass and low pass filters
(d) Low pass and low pass filters
Ans: (b)
88. Match List I with List II and select the correct answer using the code given below the
lists:
List I
A PI control
B. PD control
C. PID control
D. On-off control
Codes:
A B c
(a) 4 2 3
(c) 4 3 2
Ans: (c)
D
1
1
List II
1. Relay controller
2. Lead lag compensator
3. Lead compensator
4. Lag compensator
maximum phase lead occurs at a frequency of
(a) 50 rad/s (b) 25 rad/s (c) 10 rad/s (d) 4 rad/s
Ans: (a)
90. A third order system is approximated to an equivalent second order system. The rise
time of this approximated system will be
(a) Same as the original system for any input
(b) Smaller than the original system for any input
(c) Larger than the original system for any input
(d) Smaller or larger depending on the type of input
Ans: (b)
91. The constant magnitude locus forM =1, in G-plane is given by the following equation
where x = Re[GG co)] andy= Im[GG co)]
(a) x = -0.5 (b) x = 0 (c) x2 + i = 0.25 (d) x2 + i = 1
Ans: (a)
92. All the constant- N loci in G-plane intersect the real axis in points
(a)-1andorigin (b)-0.5and+0.5 (c)-1and+1 (d)Originand+1
Ans: (a)
93. For a unity feedback control system, if its open-loop transfer function is given by G(s)
H(s) =
10
3
, then its gain margin will be
(s + 5)
(a) 20 dB (b) 40 dB (c) 60 dB (d) 80 dB
Ans: (b)

94. The gain cross-over frequency and phase margin of the transfer function
1
are
s(s + 1)
(a) 1 rad/s and 45° (b) 2 rad/s and 45°
(c) 2 rad/s and 135° (d) 1 rad/s and 135°
Ans: (a)
95. For a type 1 system, the low frequency asymptote of its Both plot will have a slope of
(a) 0 dB/decade (b) 6 dB/decade (c) 20 dB/decade (d) -20 dB/decade
Ans: (d)
96. The characteristic equation of a particular system is given by s3 + 2s2 + 6s + 12 = 0. The
damping ratio 8 will be
(a)o=O (b)0<8<1 (c)8=1 (d)8>1
Ans: (a)
97. If root loci plots of a particular control system do not intersect the imaginary axis at any
point, then the gain margin of the system will be
(a) Zero (b) 0.707 (c) 1.0 (d) Infinite
Ans: (d)
2s+5 .
98. A system is described by the transfer function G(s) = . The de gam of the
system is
(a) 0.25
Ans: (a)
(b) 0.5
99. The sensitivity ST(K) of transfer function
(s + 5)(s + 4)
(c) 1
(1 + 2K) . h h . . b T = wit respect tot e parameter K IS given y
(3 +4K)
(a) 3+KK2 (b) 2+4~+K2
2K
(c) 3+10K+8K2
Ans: (c)
(d) 4K
2+5K+7K2
(d) 00
100. The range of K for stability of a unity feedback system whose open-loop transfer
function is G(s) = K IS
s(s + 1)(s + 2)
(a)O6 (d)O>K>3
Ans: (b)

101. For the 8085 assembly language program given below, the content of the accumulator
after the execution of the program is
(a) 00 H
Ans: (c)
3000 MVI A, 45H
3002 MOV B, A
3003 STC
3004 CMC
3005 RAR
3006 XRA B
3007 HLT
(b) 45 H (c) 67 H (d) E7 H
102. The 8254 Programmable Interval Timer is set to work in MODE 5. The following would
best describe its function:
(a) Software triggered strobe
(c) Square wave generator
Ans: (b)
(b) Hardware triggered strobe
(d) Interrupt on terminal count
103. To configure port A and port B as output ports, port C not being used in the 8155
programmable interface, the control word should have the value
(a) 03H (b) 01H (c) 02H (d) 60H
Ans: (a)
104. The 8085 microprocessor instructions with required number ofT states are given below.
Which pair is correctly matched?
(a) STAX: 8 T-states
(c) SIM 7 T-states
Ans: (b)
(b) SPHL
(d) STA
6 T-states
12 T-states
105. The crystal frequency of 8085 microprocessor is 6 MHz. The time required to execute
instruction XTHL over this microprocessor is
(a) 5.33 11sec (b) 10.67 11sec (c) 4.33 11sec (d) 8.67 11sec
Ans: (a)
106. In 8085 microprocessor, after the execution of RST 5 instruction, the program control
shifts to
(a) 0030 H (b) 0005 H (c) 0028 H (d) 0024 H
Ans: (c)
107. Consider the following 8085 interrupts:
1. TRAP
3. RST 6
5. RST 0
The software interrupts are
(a) 1 and 3 only
Ans: (c)
(b) 2 and 5 only
2. INTR
4. RST 7.5
(c) 3 and 5 only (d) 1,2,3,4 and 5

Directions: Each of the next thirteen (13) items consists of two statements, one labelled
as the 'Statement (I)' and the other as 'Statement (II)'. You are to examine these two
statements carefully and select the answers to these items using the codes given below:
Codes:
(a) Both Statement (I) and Statement (II) are individually true and Statement (II)
is the correct explanation of Statement (I)
(b) Both Statement (I) and Statement (II) are individually true but Statement (II)
in not the correct explanation of Statement (I)
(c) Statement (I) is true but Statement (II) is false
(d) Statement (I) is false but Statement (II) is true
108. Statement (I): In a transistor designed to be used for power amplification, the
collector size is largest relative to the emitter and base.
Statement (II) : The collector is connected to the body of the transistor and hence to a
heat sink for heat dissipation to be effective.
Ans: (a)
109. Statement (I): The carry look-ahead adder is a fast adder
Statement (II) : The carry look-ahead adder generates the carry and the sum digits
directly.
Ans: (a)
110. Statement (I): Root loci are symmetrical with respect to real axis of the s-plane.
Statement (II) : Root loci are normally symmetrical with respect to the perpendicular
axis of symmetry of the pole-zero combination of the loop transfer
function.
Ans: (c)
111. Statement (I) : Nyquist criterion is a powerful tool to determine stability of a closed
loop system using open loop transfer function.
Statement (II) : Nyquist criterion relates the locations of poles and zeros of the closed
loop transfer function.
Ans: (c)
112. Statement (I) : A second order system subjected to a unit impulse oscillates at its
natural frequency.
Statement (II) : Impulse input contains frequencies from -oo to +oo.
Ans: (d)
113. Statement (I) : All the systems which exhibit overshoot in transient response will also
exhibit resonance peak in frequency response.
Statement (II) : A large resonance peak in frequency response corresponds to a large
overshoot in transient response.
Ans: (a)
114. Statement (I): In a prototype second order system the rise time tr and bandwidth are
inversely proportional.
Statement (II) : Increasing con increases bandwidth while tr reduces.
Ans: (a)
18

115. Statement (I): The phase angle plot in Bode diagram is not affected by the variation
in open loop gain of the system.
Statement (II) : The variation in gain of the system has no effect on the phase margin.
Ans: (c)
116. Statement (I): FM spectrum consists of a carrier and an infinite number of side band
components.
Statement (II) : FM signals are used only in TV transmission to ensure better picture
quality.
Ans: (c)
117. Statement (I): In the two body system consisting of the earth and a satellite, centre of
mass always coincides with centre of the earth.
Statement (II) : Mass of earth is much greater than mass of satellite.
Ans: (a)
118. Statement (I): Gunn effect device is a slice made from n-doped GaAs and provides
negative resistance characteristics.
Statement (II) : GaAs has an empty energy band higher in energy than the filled or
partly filled bands.
Ans: (b)
119. Statement (I): Power output of the lowest mode in a reflex klystron is maximum.
Statement (II) : Lower modes occur at higher repeller voltages where the acceleration
of bunched electrons on return is maximum.
Ans: (d)
120. Statement (I) : The DMA technique is more efficient than the Interrupt-driven
technique for high volume 1/0 data transfer.
Statement (II) : The DMA technique does not make use of the Interrupt mechanism.
Ans: (b)

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