Recent questions tagged gate2002-ec

The dependent current source shown in given figure.delivers $80 \mathrm{~W}$absorbs $80 \mathrm{~W}$delivers $40 \mathrm{~W}$absorbs $40 \mathrm{~W}$

In given figure $1.2,$ the switch was closed for a long time before opening at $t=0$. The voltage $V x$ at $t=0^{+}$ is$25 \mathrm{~V}$$50 \mathrm{~V}$$-50 \mathrm{~V}$$0...

Convolution of $x(t+5)$ with impulse function $\delta(t-7)$ is equal to$x(t-12)$$x(t+12)$$x(t-2)$$x(t+2)$

Which of the following cannot be the Fourier series expansion of a periodic signal ?$x(t)=2 \cos t+3 \cos 3 t$$x(t)=2 \cos \pi t+7 \cos t$$x(t)=\cos t+0.5$$x(t)=2 \cos 1....

In given figure a silicon diode is carrying a constant current of $1 \mathrm{~mA}$. When the temperature of the diode is $20^{\circ} \mathrm{C}, \mathrm{V}_{\mathrm{D}}$ ...

In a negative feedback amplifier using voltage-series (i.e. voltage-sampling, series mixing) feedback.$R_i$ decreases and $R_0$ decreases$R_i$ decreases and $R_0$ increas...

A $741$-type opamp has a gain-bandwidth product of $1 \; \mathrm{MHz}$. A non-inverting amplifier using this opamp and having a voltage gain of $20 \mathrm{~dB}$ will exh...

Three identical $\text{RC}$-coupled transistor amplifiers are cascaded. If each of the amplifiers has a frequency response as shown in the figure is the overall frequency...

If the input to the digital circuit the figure, consisting of a cascade of $20 \; \mathrm{XOR}$-gates is $\mathrm{X}$, then the output $Y$ is equal to$0$$1$$\overline{X}$...

The number of comparators required in a $3$-bit comparator type ADC is$2$$3$$7$$8$

If the transistor in the figure is in saturation, then$\mathrm{I}_{\mathrm{C}}$ is always equal to $\beta_{\text{dc}} \text{I}_{\text{B}}$$\mathrm{I}_{\mathrm{C}}$ is alw...

Consider a system with the transfer function $G(s)=\frac{s+6}{k s^2+s+6}$. Its damping ratio will be $0.5$ when the value of $k$ is$2 / 6$$3$$1 / 6$$6$

Which of the following points is NOT on the root locus of a system with the open-loop transfer function $\mathrm{G}(s) \mathrm{H}(s)=\frac{k}{s(s+1)(s+3)}$$s=-\mathrm{j} ...

The phase margin of a system with the open-loop transfer function $\mathrm{G}(s) \mathrm{H}(s)=\frac{(1-s)}{(1+s)(2+s)}$ is$0^{\circ}$$63.4^{\circ}$$90^{\circ}$$\infty$

The transfer function $\mathrm{Y}(s) / \mathrm{U}(\mathrm{s})$ of a system described by the state equations $x(t)=-2 x(t)+2 u(t)$ and $y(t)=0.5 x(t)$ is$0.5 /(s-2)$$1 /(s...

The Fourier transform $\mathrm{F}\left\{e^{-t} u(t)\right\}$ is equal to $\frac{1}{1+j 2 \pi f}$. Therefore, $\mathrm{F}\left\{\frac{1}{1+j 2 \pi t}\right\}$ is$e^f u(f)$...

A linear phase channel with phase delay $T_p$ and group delay $T_g$ must have$T_p=T_g=$ constant$T_p \propto f$ and $T_g \propto f$$T_p=$ constant and $T_g \propto f$$T_p...

A $1 \; \mathrm{MHz}$ sinusoidal carrier is amplitude modulated by a symmetrical square wave of period $100 \; \mu \mathrm{sec}$. Which of the following frequencies will ...

Consider a sampled signal $y(t)=5 \times 10^{\circ}$ ${ }^6 x(t) \sum_{(n-\infty}^{+\infty} \delta \left(t-n \mathrm{T}_x\right)$ where $x(t)=10 \cos \left(8 \pi \times 1...

For a bit-rate of $8 \; \mathrm{kbps}$, the best possible values of the transmitted frequencies in a coherent binary FSK system are$16 \; \mathrm{kHz}$ and $20 \; \mathrm...

The line-of-sight communication requires the transmit and receive antennas to face each other. If the transmit antenna is vertically polarized, for best reception the rec...

The $\text{VSWR}$ can have any value between$0$ and $1$$-1$ and $+1$$0$ and $\infty$$1$ and $\infty$

In an impedance Smith chart, a clockwise movement along a constant resistance circle gives rise toa decrease in the value of reactancean increase in the value of reactanc...

The phase velocity for the $\mathrm{TE}_{10}$ – mode in an air-filled rectangular waveguide isless than $c$equal to $c$greater than $c$none of the above( $c$ is the veloc...

In the network of the figure is the maximum power is delivered to $R_{\mathrm{L}}$ if its value is$16 \; \Omega$$\frac{40}{3} \; \Omega$$60 \; \Omega$$20 \; \Omega$

If the $3$-phase balanced source in the figure is delivers $1500 \mathrm{~W}$ at a leading power factor of $0.844$, then the value of $Z_{L}$ (in ohm) is approximately$90...

The Laplace transform of a continuous-time signal $x(t)$ is $X(s)=\frac{5-s}{s^{2}-s-2}$. If the Fourier transform of this signal exists, then $x(t)$ is$e^{2 t} u(t)-2 e^...

If the impulse response of a discrete-time system is $h[n]=-5^{n} u[-n-1]$, then the system function $\mathrm{H}(z)$ is equal to$\frac{-z}{z-5}$ and the system is stable$...

An amplifier using an opamp with a slew-rate $S R=1$ $V / \mu \mathrm{sec}$ has a gain of $40 \mathrm{~dB}$. If this amplifier has to faithfully amplify sinusoidal signal...