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 Answered
 Review

Question 1 of 98
1. Question
The function f(x, y) = x^{2} + y^{2} + x + 12 has minimum value at the point

Question 2 of 98
2. Question
A random variable X has probability density function f(x) = kxe^{–}^{λx}, x ≥0 then k =

Question 3 of 98
3. Question
If the coefficient of correlation is 0.98, then the variables are

Question 4 of 98
4. Question
The order of the differential equation (dy/dx)^{2} + 5y^{1/3} = x is

Question 5 of 98
5. Question
An integrating factor of xý + y = x^{3}y^{6}

Question 6 of 98
6. Question
Which one of the following is a series method?

Question 7 of 98
7. Question
The impulse response of an LTI system is given by h[n] = 2δ[n – 20]. Determine the output y[n] if the input is x[n] = n^{2}

Question 8 of 98
8. Question
The input output relationship of a system is given by y[n] = cos[x(n)]. The system is

Question 9 of 98
9. Question
The Fourier series coefficients of a periodic signal x(t) with time period T are X_{k}. Find the signal y(t) whose Fourier series coefficients are given by Y_{k} = 2X_{k} and time period is T/5.

Question 10 of 98
10. Question
The signals x_{1}(t) and x_{2}(t) are both bandlimited to (ω_{1}, +ω_{1}) and (ω_{2}, +ω_{2}) respectively. The Nyquist sampling rate for the signal x_{1}(t)x_{2}(t) will be

Question 11 of 98
11. Question
The response of an LTI discretetime system to a periodic input with period N is

Question 12 of 98
12. Question
The step response of an LTI system whose impulse response h(n) = u(n) is

Question 13 of 98
13. Question
If the Fourier series coefficients of a signal are periodic, then the signal must be

Question 14 of 98
14. Question
Lex X_{k} represent the discretetime Fourier series (DTFS) coefficients of the periodic sequence x(n) with period N. The DTFS coefficients of the signal (1)^{n}x(n) in terms of X_{k} are

Question 15 of 98
15. Question
The Fourier transform of the exponential signal e^{j}^{ωot} is

Question 16 of 98
16. Question
Frequency response of a system with h(n) = δ(n) – δ(n – 1) is given by

Question 17 of 98
17. Question
The ROC of a causal finiteduration discretetime signal is

Question 18 of 98
18. Question
Linear phase systems have a constant

Question 19 of 98
19. Question
In an Npoint DFT of a finite duration signal x(n) of length L, the value of N should be

Question 20 of 98
20. Question
The algorithm used to compute any set of equally spaced samples of Fourier transform on the unit circle is

Question 21 of 98
21. Question
Total number of complex multiplications required in radix 2 DITFFT algorithm is

Question 22 of 98
22. Question
The steadystate error of a feedback control system with an acceleration input becomes finite in a

Question 23 of 98
23. Question
If for a control system, the Laplace transform of error e(t) is given as 8(s+3)/ s(s+10) the steady state value of the error works out as

Question 24 of 98
24. Question
The equation 2s^{4} + s^{3} + 3s^{2} + 5s + 10 = 0 has _______ roots in the left half od splane

Question 25 of 98
25. Question
Given a unity feedback control system with G(s) = K/ s(s+4), the value of K for a damping ratio of 0.5 is

Question 26 of 98
26. Question
The input to a controller is

Question 27 of 98
27. Question
If the Nyquist plot of the loop transfer function G(s)H(s) of a closedloop system encloses the (1, j0) point in the G(s)H(s) plane, the gain margin of the system is

Question 28 of 98
28. Question
A system with gain margin close to unity or a phase margin close to zero is

Question 29 of 98
29. Question
Peak overshoot of stepinput response of an underdamped secondorder system is explicitly indicative of

Question 30 of 98
30. Question
A phase laglead network shifts the phase of a control signal in order that the phase of the output

Question 31 of 98
31. Question
The Bode plot of the transfer function G(s) = s is

Question 32 of 98
32. Question
24 voice channels (4 KHz bandwidth) are sampled at 8 times the Nyquist rate and multiplexed. Each voice channel is delta modulated. 1 bit is added per frame for transmitting control information. What is the data rate of transmission?

Question 33 of 98
33. Question
Lex X be a continuous random variable with uniform PDF defined by f_{x}(x) = 1/2π, for 0 < x < 2π and zero elsewhere. Find σ_{x}.

Question 34 of 98
34. Question
The stationary process has

Question 35 of 98
35. Question
In a modulator, it is found that the amplitude spectrum of the signal at the output of the modulator consists of a component f_{c}, the carrier frequency and one component each at f_{c} + f_{m} and f_{c} – f_{m} where f_{m} is the modulating signal frequency. The modulator used is

Question 36 of 98
36. Question
If a Gaussian process X(t) is applied to the stable linear filter, then the random process developed at the output of the filter will be

Question 37 of 98
37. Question
Which of the following is incorrect ?

Question 38 of 98
38. Question
The SSBSC is used for the following application :

Question 39 of 98
39. Question
What does a logic 1 Delta Modulation (DM) bit indicate ?

Question 40 of 98
40. Question
The asymptotic value of E_{b}/N_{o} required to achieve the data rate equal to the channel capacity when the channel bandwidth tends to infinity is equal to

Question 41 of 98
41. Question
The golden rule for encoding messages with unequal probabilities is to

Question 42 of 98
42. Question
The output Signal to Noise Ratio, (SNR)_{o} of matched filter depends only on

Question 43 of 98
43. Question
In _______ multiple access is achieved by allocating different time slots for the different users.

Question 44 of 98
44. Question
Cellular CDMA system uses what modulation method ?

Question 45 of 98
45. Question
The only one signal waveform that produces zero inter symbol interference (ISI) is

Question 46 of 98
46. Question
The length of antenna depends on

Question 47 of 98
47. Question
For a broad side linear array which of the following is not correct?

Question 48 of 98
48. Question
The phase velocity of waves propagating in a hollow metal waveguide is

Question 49 of 98
49. Question
If the diameter of a λ/2 dipole antenna is increased from λ/100 to λ/50 then its

Question 50 of 98
50. Question
The directive gain cannot be stated as

Question 51 of 98
51. Question
An electromagnetic wave has electric field component along Y – direction and magnetic field component along X – direction. The electromagnetic wave is propagating along

Question 52 of 98
52. Question
The lower cutoff frequency of a rectangular wave guide with inside dimensions (3 × 4.5 cm) operating at 10 GHz is

Question 53 of 98
53. Question
During night which layer does not exist?

Question 54 of 98
54. Question
The dominant mode of rectangular waveguide is

Question 55 of 98
55. Question
Vector potential is a vector

Question 56 of 98
56. Question
A uniform plane wave in air is incident normally on an infinitely thick slab. If the refractive index of the glass slab is 1.5, then the percentage of the incident power that is reflected from the airglass interface is

Question 57 of 98
57. Question
In an impedance Smith chart, a clockwise movement along a constant resistance circle gives rise to

Question 58 of 98
58. Question
A composite voltage V = 10 sin100t + 10 cos100t is applied across a series combination of a capacitor of 1μf and resistance of 20 KΩ. The average power dissipation in the resistance is

Question 59 of 98
59. Question
The driving point impedance function Z(s) = (s^{2} + 2s + 2)/ (s^{2} + s + 1) can be realized

Question 60 of 98
60. Question
A 100Ω, 1W resistor and 800Ω, 2W resistor are connected in series. The maximum DC voltage that can be applied continuously to the series circuit without exceeding the power limit of any of the resistors is

Question 61 of 98
61. Question
Under steady state condition

Question 62 of 98
62. Question
In the series RLC circuit, the power factor of the circuit at f = f_{L} (Lower Frequency) and f = f_{0} (resonance frequency)

Question 63 of 98
63. Question
In parallel RLC circuit, if L=8H and C=2F then the value of critical resistance is

Question 64 of 98
64. Question
The transient free condition in RL and RC circuits with AC excitation will not depend on

Question 65 of 98
65. Question
A Unit impulse voltage is applied to one port network, which has two linear components. If the current through the network is 0 for t<0 and decays exponentially for t>0 then the network consists of

Question 66 of 98
66. Question
A graph of network has 4 nodes and 7 branches. The number of links(l), with respect to the chosen tree, would be

Question 67 of 98
67. Question
Choose the logic gate family which is having minimum propagation delay

Question 68 of 98
68. Question
An 8085 microprocessor based system uses a 4K × 8 bit RAM with a starting address of AA00 H. The address of the last byte in this RAM is

Question 69 of 98
69. Question
How many memory IC’s of capacity 2K × 4 are required to construct a memory capacity of 15K × 8?

Question 70 of 98
70. Question
The present output Q_{n} of an edge triggered JK flipflop is logic 1. If k=1 then Q_{n+1}

Question 71 of 98
71. Question
A 12bit (3digit) DAC that uses the BCD input code has a full scale output of 9.99 V. The value of V_{out} for an input of 0110 1001 0101 is

Question 72 of 98
72. Question
The starting address of below program is 0100 H
LXI SP, 00FF H
LXI H, 0701 H
MVI M, 20 H
MVI A, 20 H
SUB MThe content of accumulator when the program counter reaches 010B H is

Question 73 of 98
73. Question
A 1 microsecond pulse can be converted into a 1 millisecond pulse by using

Question 74 of 98
74. Question
What is the maximum frequency with which a 4bit binary ripple counter can work, if the propagation delay from CLK to Q of each flipflop is 24 ns?

Question 75 of 98
75. Question
The Boolean function f(w,x,y,z) = Ʃm(5,7,9,11,13,15) is independent of variables

Question 76 of 98
76. Question
The initial sequence of 4bit Johnson counter is 1110, what will be the sequence after third clock pulse

Question 77 of 98
77. Question
The logic function (A+B)(A’ +B’) can be implemented by giving the inputs A and B to a two input

Question 78 of 98
78. Question
The function f(A,B,C,D) = Ʃm(0,1,4,6,7,8,10,14,15), the number of prime implicants and essential prime implicants are

Question 79 of 98
79. Question
A 4.6 V is given as input to the counter type ADC and SAR type ADC then the digital output produced respectively

Question 80 of 98
80. Question
The current gain of a BJT drops at high frequencies because of

Question 81 of 98
81. Question
Which of the following fabrication is suitable for maintaining the PN junction area to the required accuracy?

Question 82 of 98
82. Question
Moore’s law relates to

Question 83 of 98
83. Question
The value of transport factor in a BJT is effected by

Question 84 of 98
84. Question
Two 10 V identical zener diodes are connected back to back, the maximum voltage drop across the diodes when they are conducting is

Question 85 of 98
85. Question
A PN junction exhibits a transition capacitive effect of several ______ farads in reverse bias, but may have many _____ farads of diffusion capacitance in the forward biased state

Question 86 of 98
86. Question
An amplifier has R_{i} = 2 KΩ and R0 = 40 KΩ and A_{v} = 90. The amplifier is modified to provide 10% negative voltage feedback in series with input. The values of R_{if} and R_{of} respectively are(in ohms)

Question 87 of 98
87. Question
ClassA power amplifier delivers 10W to a load with input signal power of 200mW. The power gain is

Question 88 of 98
88. Question
Transistor has h_{fe} = 50, its h_{fc} =

Question 89 of 98
89. Question
A cascade amplifier has higher cut off frequency

Question 90 of 98
90. Question
An ideal current controlled voltage source has

Question 91 of 98
91. Question
In BJT, Sensitivity of β (common emitter current gain) with respect to α (common base current gain) is

Question 92 of 98
92. Question
A differential amplifier has a differential gain of 20000 and CMRR = 80dB. Common mode gain is

Question 93 of 98
93. Question
Which of the following hparameters relations is incorrect ?

Question 94 of 98
94. Question
Which of the following is true for n type semiconductor ?

Question 95 of 98
95. Question
If 10 V is the peak voltage across the secondary of the transformer in a half wave rectifier with capacitive filter, peak inverse voltage of the diode will be

Question 96 of 98
96. Question
When an electron moves through a potential difference of 10 V, the energy acquired by it will be

Question 97 of 98
97. Question
Which of the following represents the Cascade configuration?

Question 98 of 98
98. Question
The scaling factor of an MOS device is α using constant voltage scaling model, the gate area of the device will be scaled by