GATE ECE 1987

## GATE ECE

(a) Specify the type of the negative feedback in the JFET amplifier shown in Fig.
(b)Calculate the voltage gain (V0/Vi)

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In case of class A amplifiers, the ratio (efficiency of transformer coupled amplifier)/(efficiency of a transformer less

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In Fig. if the CMRR of the operational amplifier is 60dB, then the magnitude of the output voltage is

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A rectangular pulse existing between t = 0 and t = T and having an amplitude A is to be received by a matched filter
(

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Companding in PCM systems leads to improved signal - to - quantization noise ratio. This improvement is for

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White Gaussian noise is passed through a linear narrow band filter. The probability density function of the envelope of

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The variance of a random variable X is $$\sigma _x^2\,.$$ Then the variance of - kx (where k is a positive constant ) is

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In the signal flow graph shown in fig X2= TX1 where T is equal to

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For the system shown in figure the transfer function $$\frac{\mathrm C\left(\mathrm s\right)}{\mathrm R\left(\mathrm s\r

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A system has fourteen poles and two zeroes. Its high frequency asymptote, in its magnitude plot, has having a slope of

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The popular plot of G(s)=$${{10} \over {s{{\left( {s + 1} \right)}^2}}},$$ intercepts real axix at $$\omega = {\omega _

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The magnitude plot of the open loop transfer function G(s), of a certain system is given in fig,
(a) Determine G(s), if

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A system with derivative control is shown in figure.
(a)Determine the transfer function and the characteristic equation

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The subtraction of a binary number Y from another binary number X, done by adding the 2's complement of Y to X, result i

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Fill in the blanks of the statements below concerning the following Logic Families:
Standard TTL (74XX), Low power TTL(

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Given that for a logic family,
$${V_{OH}}$$ is the minimum output high-level voltage
$${V_{OL}}$$ is the minimum outp

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The circuit diagram of a 2 bit A to D converter is shown in figure below. The combinational logic is to be disigned to p

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A 2-input up/down synchrconous counter using two toggle flip-flops is shown in Fig.1. The counter's sequence is to be co

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A ripple counter using negative edge-triggered D-flip flops is shown in Fig.1. The flip-flops are cleared to '0' by a '0

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Choose the correct statements relating to the circuit of figure

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For an electromagnetic wave incident from one medium to a second medium, total reflection takes place when

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A transmission line of pure resistive characteristic impedance is terminated with an unknown load. The measured value of

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An electrostatic field is said to be conservative when

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Two long parallel wires in free space are separated by a distance R and carry currents of equal magnitude but opposite i

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An electric field is given by $$\overrightarrow E = \overrightarrow a {}_x\,{\rm A}\,\,\sin \,\beta ySin\,\,\omega t$$

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The cut-off frequency of a waveguide depends upon

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A thin dipole antenna is $$\left( {\lambda /15} \right)$$ long, where $$\lambda $$ is the voperating wavelength. If the

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In an intrinsic semiconductor the free electron concentration depends on

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The diffusion capacitance of a P-N junction

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A square waveform as shown in the figure is applied across 1 mH ideal inductor.The current through the inductor is a tri

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The impedance function of a parallel $$R$$, $$L$$, $$C$$ circuit has poles located at $$ - 3 \pm j4$$ rad/sec. If the

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The value of current through the 1F capacitor of figure is.

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Laplace transform of the functions t u(t) and u(t) sin(t) are respectively:

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