HELLOSOFT 1

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HELLOSOFT-2K1 PSGCT, Covai.
SECTION-A
(14*1=14)
1.The impulse responce of a system is
h(n)={0,1,0.5,0,125,---}.then the response of the
system for the unit step i/p is _________ .
2.The impulse responce of the discrete time
systemdescribed by y(n)=1/2
x(n)
+2 x(n) + x(n-2) + 2 x(n-3) + 1/2
x(n-4)is___________ .
3.helbert transform of a unit impulse function
is________ .
4.The convolution of the sinc function itself is
_________ .
5.If a signal is real & odd in the time domain,
theFourier Transform is

_____ .6.Given y(n)=x(2-n)+1,checkwhether the
function is
linear, causual, time invariance, memory.
7.the frequency range of FM radio broadcast is in
b/w___ & ______ .
8.If a signal having 6.5khz is sampled at a rate of
8khz frequency then the aliasing frequency is
1) 1.5khz 2)6.5khz 3)2.5khz 4)
9.If a 1khz signal has an attenuation of 5db, then
theattenuation of
32khz is
a)-40db b) -70db c) ---- d) non of these
10.which one of the system has stable.
a) u(n)/n b) [1/n]**2 c)e**(-3n) d) sin(3n/n)
11.match the following sentences.
a) bilinear transformation --- IIR filter
b) increase in FIR filter ----- a tan(w/2)
c)poles in the transfor function --- poles in
thes- plane eclipse.
d) frequency, sampling method --- transition
widthreduced
e) chebyshev responce ------- ---------- .
12.name the 2 signals which have the same shape
infrequency & time
domain.
ans: gaussian & impulse responce13.For sin(nwt) to
be periodic, 'n'
must be
a)rational b) any number c) irrational14. given
H(s) =s/(s+a).It
represents
a) LPF b) HPF C) BPF D) ---- .
SECTION-B (12*1=12)
1.-32768 can be represented in 16 bit binary as
__________ .
2.0x80c is right shifted by 2 . then the number
formedis_______
3.if interrupt is enabled while the processor is
working.then the course of actions that took
placeare
ans:it completes the current instruction &
controlof the processor
jumps
to the starting address of the
interruptservice routine.
4.why we r selecting DSP processor over
microprocessor. a)multiple
processing
b)pipeline processing c)high clk rate
d)-----
5.short int *y ,*(*y) represents ________ .
ans:0x755.
6.find the value of s+= x+(y>>2) . given
s=0x100,x=0x50,y=0x20. then
s=?
7. advantage of pipelining ?8.the transfer function of
a system is
invertable if
a)both poles & 0's outside the unit circle
b) if both poles & 0's inside the unit circle.
c)poles inside , 0's ouside of the unit circle.
d)poles outside, o's inside of the unit circle.
9)OSI reference model consists of _____ layers.
10.FAX/EMAIL/--- can be sent through PSDN modem.
state whether it is true or false.11.the 2's
complete range is
________
ans:-128 to +12712.arithmatic left shift of ox200F
results ______
.
* bits on Random process.
INTERVIEW QUESTIONS:
1.what is adaptive filter? where we can use
thesefilters.
2.what is the F.T of rectangle?3.what is the
convolution of 2
rectangles?
4.if we replace a flipflop with a latch.what
willhappen? ans:racing
problem
5.design a irregular counter.6.F.T or Z transform of
sin(o.2*pi*n)
7.questions on randaom process
8.compare PLC(programmable logic counter) with micro
processor in economic point of view.
9. realize filter for {1,1,2}. and realize it?
10.0.8+j0.2 is one of the roots of FIR filter. what
rthe other roots?
11. a)y(n)=x(n) + x(n-1) + 10**36 x(n-2)+ --- b)
y(n)=2y(n-1)+x(n-3)+-----.
In the above which one is stable? ans:a
12.for designing IIR filter, which method is best?
13.what is aliasing? & sampling?
14.where the fourier series(F.S) & F.T were used?
15.write equations for F.S & F.T.16.where the laplace
transform is
used?
17.in F.T why e**(-jwnt) is used? this question was
asked in bel crl
also.
18.properties of butterworth , chebyshev &
ellipticfilters?
19.in which filter the transition width is lower?
20.why linear phase condition will be assumed in DSP?
21.if all poles & 0's in the left half of the s-plane,
it is called
____ .
22.FFT ,DFT formulae.23. what is the difference b/w
bilinear
transformation
& impulse invariant transformation? which is
mostlyused? & why?
*they mainly concentrated on filters.