**SIGNALS & SYSTEMS**

1. The
Fourier series of an odd periodic function contains only

__Sine terms.__
2. The
Fourier transform of a real valued time signal has

__Conjugate symmetry.__
3. If
a signal f(t) has energy E, the energy of the signal f(2t) is equal to

__E/2.__
4. The
Laplace transform of a unit ramp function starting at t=a, is

__/____.__
5. The
z-transform f(z) of the function f(nT)=
is

__z/z-____.__
6. The
transfer function of a linear system is a

__Ratio of the Laplace transform of the output and that of the input with all initial conditions zero.__
7. A
system with an input x(t) and an output y(t) is described by the relation:

y(t)=t x(t).this system is

**.**__linear and time varying__
8. A
system is defined by its impulse response h(n)=
u(n-2). The system is

__Causal but not stable.__
9. A
rectangular pulse of duration T is applied to a filter matched to this input.
The output of the filter is a

__Triangular pulse.__
10. Increased
pulse-width in the flat-top sampling, leads to

__Attenuation of high frequencies in reproduction.__
11. Flat
top sampling of low pass signals

__gives rise to aperture effect.__
12. A
band limited signal is sampled at the Nyquist rate. The signal can be recovered
by passing the samples through

__an ideal low-pass filter with the appropriate bandwidth.__
13. The
ACF of a rectangular pulse of duration T is

**.**__a triangular pulse of duration 2T__
14. The
system has one or more outputs is called

__response.__
15.

**sampling uses sample and hold circuit.**__Flattop__
16. Fourier
series used to analyze

**signals.**__Periodic__
17. When
the high frequency interferes with low frequency and appears as low frequency
then it is called

__aliasing.__
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