# Recent questions tagged nielit2017oct-assistanta-cs

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 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
A sequential circuit using D flip-flop and logic gates is shown in Figure, where $X$ and $Y$ are the inputs and $Z$ is the output. The circuit is $\text{S-R}$ Flip-flop with inputs $X = R$ and $Y=S$ $\text{S-R}$ Flip-flop with inputs $X = S$ and $Y=R$ $\text{J-K}$ Flip-flop with inputs $X = J$ and $Y=K$ $\text{J-K}$ Flip-flop with inputs $X = K$ and $Y=J$
10
A $4$ bit ripple counter and a $4$ bit synchronous counter are made using flip-flops having a propagation delay of $10$ ns each. If the worst case delay in the ripple counter and the synchronous counter be $R$ and $S$ respectively, then $R = 10$ ns, $S = 40$ ns $R = 40$ ns, $S = 10$ ns $R = 10$ ns, $S = 30$ ns $R = 30$ ns, $S = 10$ ns
11
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
12
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 $2$ $4$ $8$ $16$
13
Which level of RAID refers to disk mirroring with block striping? RAID level $1$ RAID level $2$ RAID level $0$ RAID level $3$
14
Which of the following is not a form of main memory? Instruction cache Instruction register Instruction opcode Translation look-aside buffer
1 vote
15
The following program fragment prints int i = 5; do { putchar(i+100); printf(“%d”, i--;) } while(i); i5h4g3f2el 14h3g2f1e0 An error message None of the above
16
The running time of an algorithm $T(n),$ where $’n’$ is the input size , is given by $T(n) = 8T(n/2) + qn,$ if $n>1$ $= p,$ if $n = 1$ Where $p,q$ are constants. The order of this algorithm is $n^{2}$ $n^{n}$ $n^{3}$ $n$
17
Which of the following is a desirable property of module? Independency Low cohesiveness High Coupling Multifunctional
18
The solution of the recurrence relation $a_{r} = a_{r-1} + 2a_{r-2}$ with $a_{0} = 2,a_{1} = 7$ is $a_{r} = (3)^{r} + (1)^{r}$ $2a_{r} = (2)^{r}/3 – (1)^{r}$ $a_{r} = 3^{r+1} – (-1)^{r}$ $a_{r} = 3(2)^{r} – (-1)^{r}$
19
The convergence of the bisection method is Cubic Quadratic Linear None
20
In a ripple counter using edge-triggered $JK$ flip-flops, the pulse input is applied to Clock input of all flip-flops $J$ and $K$ input of one flip-flop $J$ and $K$ input of all flip flops Clock input of one flip-flop
21
$M$ is a square matrix of order $’n’$ and its determinant value is $5.$ If all the elements of $M$ are multiple by $2,$ its determinant value becomes $40.$ The value of $’n’$ is $2$ $3$ $5$ $4$
22
When transaction $Ti$ requests a data item currently held by $Tj,Ti$ is allowed to wait only if it has a timestamp smaller than that of $Tj$ (that is $Ti$ is order than Tj). Otherwise, $Ti$ is rolled back (dies). This is Wait-die Wait-wound Wound-wait Wait
23
What will be the output of following? main() { Static int a = 3; Printf(“%d”,a--); If(a) main(); } $3$ $3\;2\;1$ $3\;3\;3$ Program will fall in continuous loop and print $3$
24
Web links are stored within the page itself and when you wish to ‘jump’ to the page that is linked, we select the hotspot or anchor. This technique is called Hypertext Hypermedia Both $(A)$ and $(B)$ Anchoring
25
A decimal has $25$ digits. The number of bits needed for its equivalent binary representation is approximately, $50$ $74$ $40$ $60$
26
Which of the following is minimum error code? Octal Code Binary Code Gray Code Excess-$3$ Code
1 vote
27
Match list $I$ with List $II$ ... A-i, B-ii, C-iii, D-iv A-iii, B-ii, C-iv, D-i A-ii, B-iii, C-i, D-iv A-i, B-iv, C-ii, D-iii
If a processor has $32$-bit virtual address, $28$-bit physical address, $2$ kb pages. How many bits are required for the virtual, physical page number? $17,21$ $21,17$ $6,10$ None
A binary search tree contains the values-$1,2,3,4,5,6,7$ and $8.$ The tree is traversed in preorder and the values are printed out. Which of the following sequences is a valid output? $5\;\;3\;\;1\;\;2\;\;4\;\;7\;\;8\;\;6\;\;$ $5\;\;3\;\;1\;\;2\;\;6\;\;4\;\;9\;\;7$ $5\;\;3\;\;2\;\;4\;\;1\;\;6\;\;7\;\;8$ $5\;\;3\;\;1\;\;2\;\;4\;\;7\;\;6\;\;8$
The question is based on the following program fragment. f(intY[10],int x){ int u,j,k; i=0;j=9; do{ k=(i+j)/2; if(Y[k] < x) i=k; else j=k; } while(Y[k]!=x) && (i<j)); if (Y[k]==x) printf( x is in the array. ); else printf( x is not in the array. ); } On which of the following contents of ... $x>2$ $Y$ is $[2\;4\;6\;8\;10\;12\;14\;16\;18\;20]$ and $2<x<20$ and $'x'$ is even