GATE EC question library

The signal to quantisation noise ratio in an $n$-bit $\text{PCM}$ system

Copper behaves as a

An antenna, when radiating, has a highly directional radiation pattern. When the antenna is receiving, its radiation pattern

The intrinsic impedance of a lossy dielectric medium is given by

The electric field strength at a distance point, $\mathrm{P}$, due to a point charge, $+q$. located on the origin, is $100 \; \mu \mathrm{V} / \mathrm{m}$. If the point charge is now enclosed by a perfectly conducting metal sheet sphere whose centre is at the origin, then the electric field strength at the point. $P$. outside the sphere, becomes.

A $1.0 \; \mathrm{kHz}$ signal is flat-top sampled at the rate of $1800$ samples sec and the samples are applied to an ideal rectangular $\text{LPF}$ with cat-off frequency of $1100 \mathrm{~Hz}$, then the output of the filter contains.

A $\text{PAM}$ signal can be detected by using

A $\text{PLL}$ can be used to demodulate

If the number of bits per sample in a $\text{PCM}$ system is increased from improvement in signal-to quantisation noise ratio will be

For a narrow band noise with Gaussian Gradrature components, the probability density function of its envelope will be

The image (second) channel selectivity of a super beterodync communication receiver is determined by

An 'Assembler' for a microprocessor is used for

A $\text{‘DMA'}$ transfer implies

An $\text{R-S}$ latch is a

The minimum number of $\text{MOS}$ transistors required to make a dynamic $\text{RAM}$ cell is

When a $\text{CPU}$ is interrupted, it

A switch-tail ring counter is made by using a single $\text{D}$ flip-flop. The resulting circuit is a

The minimum number of $\text{NAND}$ gates required to implement the Boolean function $\mathrm{A}+\mathrm{A} \overline{\mathrm{B}}+\mathrm{A} \overline{\mathrm{B}} \mathrm{C}$, is equal to

The output of the circuit in the figure is equal to

To obtain very high input and output impedances in a feedback amplifier, the topolomostly used is