76. Twenty-four voice signals are sampled uniformly at a rate of 8 kHz and then time-division multiplexed. The sampling process uses flat-top samples with 1 us duration. The multiplexing operating includes provision for synchronization by adding an extra pulse of 1 us duration. The spacing between successive pulses of the multiplexed signal is (Give the answer in ns):
77. Norton’s theorem states that a complex network connected to a load can be replaced with an equivalent impedance:
78. In the circuit give below, If the “on” resistance of the MOSFET labeled “Qp” is 200 Ω and the “on” resistance of the MOSFET labeled 'QN” is 100 Ω, then if 10 mA of current is sourced in the high state, Voh is X. If 10 mA of current is sunk in the low state, V0L is Y, then X + Y =?
79. The discrete-time signal x(n) = (- 1)' is periodic with fundamental period :
80. At a frequency of 1 GHz and transmitter-receiver distance of 30 mi, which is the most efficient device for energy transfer:
81. Non-coherently detection is not possible for:
82. An increase in the base recombination of a BJT will increase :
83. If the correct statements out of the ones given below are given a binary 1 and incorrect ones are assigned a 0, then the 2’s compliment of the 6 bit binary number (consider first statement's assignment as least significant bit) is :. (i) Statistical independence implies negative covariance(ii) Group 3 MH fax code uses a form of arithmetic coding(iii) Steven's law states that rational scales follow a logarithmic law(iv) The Karhunen-Lo eve transform is commonly approximated by the z-transform(v) 40 dB corresponds to an 80x increase in voltage.(vi) The human ear has about 480 critical bands
84. Two sequences xl(n) and x2(n) are related by 2(n) = xl(-n). In the z-domain, their ROC’s are:
85. The dominant mode for waveguide operation is :
86. A telephone exchange has 9000 subscribers. If the number of calls originating at peak time is 10,000 in one hour, the calling rate is:
87. In CMOS technology, shallow P-well or N-well regions can be formed using:
88. In the following circuit employing pass transistor logic, all NMOS transistors are identical with a threshold voltage of 1 V. Ignoring the body-effect, if the output voltages at P, Q and R are p, q and r then p + q - r = ?
89. The system characterized by the equation y(t) = ox(f) + b is :
90. Ridged waveguides are advantageous over rectangular waveguides in their:
91. Calculate the relation for V0fVj for this network. Write the answer up to 4 decimal places. Given L = ImH, ^ = 1KG, R2 = 2KG.C = lnF,W = 1MHz :
92. In the following circuit s0, s, and External Clock are the inputs to the circuit, with External clock, s0, and as square pulses of time periods having a ratio of 1: 2 : 4. Taking time period of the External clock as 1 s, find at t= 2s, 4s, 6s, 8s and 10s. Give your answer as Q^ for the specified time in the order given without spaces. (Assume Qas s0, Sj, External clock = 0 at t = 0):
93. The FT of a rectangular pulse existing between t = - T/2 to t = T/2 is a :
94. When the length of antenna is a whole wavelength :
95. Consider the following statements :1. The amplitude of an FM wave is constant2. FM is more immune to noise than AM3. FM broadcasts operate in upper VHF and UHF frequency ranges4. FM transmitting and receiving equipments are simpler as transmitting and receiving equipmentsWhich of the above are correct?
96. Find the resonating frequency of the circuit in MHz :
97. Find the frequency at the point z in Hz:
98. The Fourier transform of the exponential signal e'V is:
99. Assertion (A) : The maximum range of a radar is proportional to fourth root of the peaktransmitted pulse power.Reason (R) : Radar signals are subjected twice to inverse square law.(A) Both (A) and (R) are correct and (R) is correct explanation of (A)cr
100. Assertion (A) : Free space does not interfere with normal radiation and propagation of radiowaves,Reason (R) : Free space has no magnetic or gravitational fields.
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