GATE 1989 Electronics & Communication

Indicate which of the following logic gates can be used to realize all possible combinational Logic functions:

A load, Z L = R L + jX L is to be matched, using an ideal transformer, to a generator of internal impedance, Z S = R S + jX S . The turns ratio of the transformer required is

A 10 Ω resistor, a 1 H inductor and 1 $$\mathrm{μF}$$ capacitor are connected in parallel.The combination is driven by a unit step current.Under the steady state condition, the sou...

Of the four biasing circuits shown in Fig. For a BJT, indicate the one which can have maximum bias stability:

Nyquist plot consider a feed back system where the OLTF is: $$G(s) = {1 \over {s\left( {2s + 1} \right)\left( {s + 1} \right)}}.$$ Determine the asymptote which the nyquist plot ap...

A part of a communication system consists of an amplifier of effective noise temperature, $$Te = \,\,21\,\,{}^ \circ K\,$$, and a gain of 13 dB, followed by a cable with a loss of...

The skin - depth of copper at a frequency of $$3 GHz$$ is $$1$$ micron ($${{{10}^{ - 6}}}$$ metre). At $$12 GHz$$, for a non - magnetic conductor whose conductivity is $$1/9$$ time...

A 50 ohm lossless transmission line has a pure reactance of (j100) ohms as its load. The VSWR in the line is :

The electric field strength at a far-off point P due to a point charge + q, located at the origin O is 100 millivolts/metre. The point charge is now enclosed by a perfectly conduct...

Zero mean Gaussian noise of variance N is applied to a half wave rectifier. The mean squared value of the rectifier output will be:

In binary data transmission DPSK is preferred to PSK because

The condition AD - BC = 1 for a two-port network implies that the network is a

In a microprocessor system, the stack is used for

A signal of bandwidth 3.5 kHz has peak-to-peak and rms amplitudes of 4 V and 0.2 V, respectively. This signal is passed through a linear PCM coder and then transmitted over a chann...

Design a rectangilar hollow metal waveguide to operate in the X-band such that at an operating free-space wavelength of 3.2 cm (a) The guide-wavelength for the $$T{E_{{{10}^ - }}}$...

Two vertically oriented half wave dipoles are spaced 1.5 wavelengths apart to from an array. Calculate the half power beam widths of the major lobes of the array, in the horizontal...

A source produces 4 symbols with probabilities $${1 \over 2},\,{1 \over 4},\,{1 \over 8}\,\,and\,\,{1 \over 8}.$$ For this source, a practical coding scheme has an average codeword...

The condition AD - BC = 1 for a two-port network implies that the network is a

Among the digital IC-families-ECL, TTL and CMOS:

From the Nicholas chart, one can determine the following quantities pertaining to a closed loop system:

For the transfer function of a physical two-port network

A logic family has threshold voltage $${V_T}$$= 2V, minimum guaranteed output high voltage $${V_{OH}}$$= 4V, minimum accepted input high voltage $${V_{IH}}$$ = 3V, maximum guarante...

In the case of ground wave propagation, at far-off distances from the transmitting tower antenna, the Poynting vector is