GATE EC question library

For a dipole antenna

A plane eelctromagnetic wave travelling along $+z$ – direction, has its electric field given by $\mathrm{E}_{x}=2 \cos \left({ }^{*} t\right)$ and $\mathrm{E}_{y}=2 \cos \left({ }^{*} t+90^{\circ}\right)$. The wave is

For a short wave radio link between two stations via the ionosphere, the ratio of the maximum usable frequency to the critical frequency

Medium wave radio signals may be received at far off distances at night because

Increased pulse-width in the flat-top sampling, leads to

$v(t)=5[\cos (106 \; \pi t)-\sin (103 \; \pi t) \times \sin (106 \; \pi t)$ represents

A dynamic $\text{RAM}$ consists of

A $\text{PLA}$ can be used

The output of a logic gate is ‘$1$’ when all its inputs are at logic ‘$0$’. Then gate is either

Data can be changed from spatial code to temporal code and vice-versa by using

A class - A transformer coupled, transistor power amplifier is required to deliver a power output of $10$ watts. The maximum power rating of the transistor should not be less than

The threshold voltage of an $n$ channel $\text{MOSFET}$ can be increased by

A small concentration of minority carries is injected into a homogeneous semiconductor crystal at one point. An electric field of $10 \mathrm{~V} . \mathrm{cm}$ is applied across the crystal and this moves the minority carriers a distance of $1 \mathrm{~cm}$ is $20 \; \mu \; \mathrm{sec}$. The mobility (in $\mathrm{cm}^{2} /$ volt. sec) will be

If the open-loop transfer function is a ratio of a numerator polynomial of degree ' $m$ ' and a denominator polynomial of degree '$n$', then the integer $(n-m)$ represents the number of

The $3-d \mathrm{B}$ bandwidth of a typical second-order system with the transfer function $\frac{\mathrm{C}(s)}{\mathrm{R}(s)}=\frac{w_{n}^{2}}{s^{2} \mathrm{t}+2 x w_{n} s+w_{n}^{2}}$ is given by

A ramp voltage, $v(t)=100$ volts, is applied to an $R C$ differentiating circuit with $R=5 \; \mathrm{k} \Omega$ and $C=4$ $\mu \mathrm{F}$. The maximum output voltage is

A series $\text{LCR}$ circuit consisting of $R=10 \; \Omega$, $\left|X_{L}\right|=20 \; \Omega$ and $\left|X_{C}\right|=20 \; \Omega$, is connected across an $a . c$. supply of $200 \text{V rms}$ . The $\text{rms}$ voltage across the capacitor is

The Fourice Series of a odd periọdic function, contains only

The Laplace transform of a unit ramp function starting at $t=a$, is