# Recent questions in Others

1
Twelve $1\;\Omega$ resistances are used as edges to from a cube. The resistance between two diagonally opposite corners of the cube is $\frac{5}{6}\;\Omega$ $\frac{1}{6}\;\Omega$ $\frac{6}{5}\;\Omega$ $\frac{3}{2}\;\Omega$
2
An ideal op-amp is an ideal voltage controlled current source voltage controlled voltage source current controlled current source current controlled voltage source
3
The final value theorem is used to find the Steady state value of the system output Initial value of the system output Transient behavior of the system output None of these
4
For the discrete signal $x[n] = a^{n}u[n],a>0$ the $z$-transform is $\frac{(z+a)}{z}$ $\frac{(z-a)}{z}$ $\frac{z}{(z-a)}$ $\frac{z}{(z+a)}$
5
For a periodic signal $v(t) = 30\sin 100t + 10\cos 300t + 6\sin(500t + \frac{\pi}{4}),$ the fundamental frequency in rad/s $100$ $300$ $500$ None of these
6
A solution for the differential equation $x’(t) + 2x(t) = \delta(t)$ with initial condition $x(\overline{0}) = 0$ $e^{-2t}u(t)$ $e^{2t}u(t)$ $e^{-t}u(t)$ $e^{t}u(t)$
7
If the number of bits per sample in a PCM system is increased from a $n$ to $n+1,$ the improvement in signal to quantization nose ratio will be $3\;dB$ $6\;dB$ $2n\;dB$ $n\;dB$
8
A carrier $Ac\cos(\omega c)t$ is frequency modulated by a signal $Em\cos(\omega m)t.$ The modulation index is $mf.$ The expression for for the resulting FM signal is $Ac\cos [\omega ct + mf\sin(\omega m)t]$ $Ac\cos [\omega ct + mf\cos(\omega m)t]$ $Ac\cos [\omega ct + \pi mf\sin \omega m t]$ $Ac\cos [\omega ct + 2\pi mf Em \cos(\omega m)t/\omega m]$
9
In MOSFET fabrication, the channel; length is defined during the process of Isolation oxide growth Channel stop implantation Poly-silicon gate patterning Lithography step leading to the contact pad
10
The open-loop transfer function of a feedback control system is $G(s)\cdot H(s) = 1/(s+1)^{3}.$ The gain margin of the system is $2$ $4$ $8$ $16$
11
Twelve $1\;\Omega$ resistances are used as edges to from a cube. The resistance between two diagonally opposite corners of the cube is $\frac{5}{6}\;\Omega$ $\frac{1}{6}\;\Omega$ $\frac{6}{5}\;\Omega$ $\frac{3}{2}\;\Omega$
12
An ideal op-amp is an ideal voltage controlled current source voltage controlled voltage source current controlled current source current controlled voltage source
13
The final value theorem is used to find the Steady state value of the system output Initial value of the system output Transient behavior of the system output None of these
14
For the discrete signal $x[n] = a^{n}u[n],a>0$ the $z$-transform is $\frac{(z+a)}{z}$ $\frac{(z-a)}{z}$ $\frac{z}{(z-a)}$ $\frac{z}{(z+a)}$
15
For a periodic signal $v(t) = 30\sin 100t + 10\cos 300t + 6\sin(500t + \frac{\pi}{4}),$ the fundamental frequency in rad/s $100$ $300$ $500$ None of these
16
A solution for the differential equation $x’(t) + 2x(t) = \delta(t)$ with initial condition $x(\overline{0}) = 0$ $e^{-2t}u(t)$ $e^{2t}u(t)$ $e^{-t}u(t)$ $e^{t}u(t)$
17
If the number of bits per sample in a PCM system is increased from a $n$ to $n+1,$ the improvement in signal to quantization nose ratio will be $3\;dB$ $6\;dB$ $2n\;dB$ $n\;dB$
A carrier $Ac\cos(\omega c)t$ is frequency modulated by a signal $Em\cos(\omega m)t.$ The modulation index is $mf.$ The expression for the resulting FM signal is $Ac\cos [\omega ct + mf\sin(\omega m)t]$ $Ac\cos [\omega ct + mf\cos(\omega m)t]$ $Ac\cos [\omega ct + \pi mf\sin \omega m t]$ $Ac\cos [\omega ct + 2\pi mf Em \cos(\omega m)t/\omega m]$
The open-loop transfer function of a feedback control system is $G(s)\cdot H(s) = 1/(s+1)^{3}.$ The gain margin of the system is $2$ $4$ $8$ $16$