GATE 1992 Electronics & Communication

Choose the correct satatement(s) from the following:

A transmission line whose characteristic impedance is a pure resistance

For a 2-port network to be reciprocal

Relative to a given fixed tree of a network

Given a unity feedback system with open loop transfer function, $$$G\left(s\right)=\frac K{s\left(s+1\right)\left(s+2\right)}$$$ The root locus plot of the system is of the form.

A semiconductor is irradiated with light such that carriers are uniformly generated throughout its volume. The semiconductor is n-type with $$N_D=10^{19}/cm^3$$. If the excess elec...

In an 8085 microprocessor system with memory mapped I/O,

Which of the following signals is/are periodic?

The maximum power efficiency of an AM modulator is

In a transistor having finite B, the forward bias across the base emitter junction is kept constant and the reverse bias across the collector base junction is increased. Neglecting...

An n-channel JFET has a pinch-off voltage V P = -5 V, V DS (max) = 20 V and g m = 2 mA/V. The minimum ‘ON’ resistance is achieved in the JEFT for

A linear discrete - time system has the characteristic equation, $${z^3} - 0.81\,\,z = 0.$$ The system

A uniform plane wave traveling in free space along the +$$z$$ direction and having its electric field along the$$ x$$-direction, is normally incident on a thick brass sheet, infini...

If G(f) represents the Fourier transform of a signal g (t) which is real and odd symmetric in time, then

A combinational circuit has three inputs A, B and C and an output F. F is true only for the following input combinations? A is false and B is true A is false and C is true A, B and...

An n-channel JFET has a pinch-off voltage of V p = -5V. V DS (max) = 20V and g m = 2mA/V. The minimum 'ON' resistance is achieved in the JFET for

The bit stream 01001 is differentially encoded using 'Delay and Ex OR' scheme for DPSK transmission. Assuming the reference bit as a '1' and assigning phases of '0' and '$$\,\pi $$...

A process with open-loop model $$G(s) = {{K{e^{ - s{\tau _d}}}} \over {\tau s + 1}},$$ is controlled by a PID controller. For this process

Source encoding in a data communication system is done in order to

A linear time-invariant system is described by the state variable model $$$\left[ {\matrix{ {{{\mathop x\limits^ \bullet }_1}} \cr {{{\mathop x\limits^ \bullet }_2}} \cr } } \right...

A unity feedback system has open-loop transfer function $$G(s) = {1 \over {s\left( {2s + 1} \right)\left( {s + 1} \right)}}$$ Sketch Nyquist plot for the system and there from obta...

Coherent demodulation of FSK signal can be effected using

Two dissimilar antennas having their maximum directivities equal

A new clocked "X-Y" flip-flop is defined with two inputs, X and Y in addition to the clock input. The flip-flop functions as follows: If XY=00, the flip-flop changes stage with eac...

The beam width-between-first-null of a uniform linear array of N equally-spaced (element spacing = d) equally-excited antennas is determined by