GATE ECE 1991
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GATE ECE

In figure, all transistors are identical and have a high value of beta. The voltage VDC is equal to ______.
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Two non-inverting amplifiers, one having a unity gain and other having a gain of twenty, are made using identical opera
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For the signal constellation shown in the figure, the type of modulation is ________.
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A binary source has symbol probabilities 0.8 and 0.2. If extension coding (blocks of 4 symbols) is used, the lower and u
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Two resistors $$\,{R_1}$$ and $$\,{R_2}$$ (in ohms) at temperatures $${T_1}{}^ \circ K$$ and $${T_2}{}^ \circ K$$ respec
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In the signal flow graph of Figure, the gain c/r will be
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A unity feedback control system has the open loop transfer function $$G\left(s\right)\;=\;\frac{4\left(1\;+\;2s\right)}
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A second order system has a transfer function given by $$\mathrm G\left(\mathrm s\right)\;=\;\frac{25}{\mathrm s^2\;+\;8
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The characteristic equation of a feedback control system is given by s3 +5s2 +(K + 6)s + K =0 Where K > 0 is a scalar
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The open-loop transfer function of a feedback control system is G(s)=$${1 \over {{{\left( {s + 1} \right)}^3}}}$$The ga
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A linear second order single input continuous-time system is described by the following set of differential equations $
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The four variable function f is given in terms of min-terms as: f (A B C D ) = $$\sum {} $$m (2,3,8,10,11,12,14,15 .) U
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A SR FLIP-FLOP can be converted into a T FLIP-FLOP by connecting ___ to Q and ___ to $$\overline Q $$.
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The CMOS equivalent of the following n MOS gate (figure) is ________ (draw the circuit ).
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In figure, the Boolean expression for the output in terms of inputs A, B and C when the clock ‘CK’ is high, is given by
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The electric field component of a uniform plane electromagnetic wave propagating in the $$Y$$-direction in a lossless
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The input impedance of a short-circuited lossless transmission line guarter wave long is
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A uniform plane electromagnetic wave traveling in free-space enters into a lossless medium at normal incidence. In the m
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In a board side array of 20 isotropic radiators, equally spaced at a distance of $$\lambda /2$$, the veam width between
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In the radiation pattern of a 3-element array of isotropic radiators equally spaced at distances of $${\lambda /4}$$ it
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A silicon sample is uniformly doped with 1016 phosphorous atoms/cm3 and 2 ×1016 boron atoms/cm3. If all the dopants are
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The small signal capacitances of an abrupt P+−N junction is 1 nF at zero bias. If the built-in voltage is 1 volt, the ca
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Referring to the figure. The switch S is in position 1 initially and steady state conditions exist from time t = 0 to t
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The program given below is run on an 8085 based microcomputer system. Determine the contents of the registers: PC, SP, B
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In a series RLC high Q circuit, the current peaks at a frequency
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Two two-port networks are connected in cascade. The combination is to be represented as a single two-port network. The p
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The necessary and sufficient condition for a rational function of s, T(s) to be driving point impedance of an RC network
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The network shown in figure is initially under steady-state condition with the switch in position 1. The switch is moved
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Find the Laplace transform of the waveform x(t) shown in Fig.1.
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The voltage across an impedance in a network is V(s) = Z(s) I(s), where V(s), Z(s) and $${\rm I}$$(s) are the Laplace Tr
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An excitation is applied to a system at $$t = T$$ and its response is zero for $$ - \infty < t < T$$. Such a sys
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The pole-zero pattern of a certain filter is shown in the Fig. The filter must be of the following type.
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A signal has frequency components from 300 Hz to 1.8 KHz. The minimum possible rate at which the signal has to be sample
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