JNTUH PREVIOUS ONLINE BITS
UNIT-I:
SECTION-I:
MULTIPLE CHOICE QUESTIONS
1. The differentiation of a unit
step signal is? [b]
a) Ramp signal b) impulse signal c) exponential
signal d)parabolic signal
2. If the function x(t) has odd
and half wave symmetry, then the Fourier series will have only[a ]
a) Odd harmonics of sine terms b)
Even harmonics of cosine terms
c) Even harmonics of sine terms d) Odd harmonics of
cosine terms
3. The functions sin nωot, and sin mωot are always [c ]
a) Orthogonal b) Parallel c) Inclined d) None
4. The sum of discrete
exponentials with infinite amplitudes gives. [b ]
a) Complex wave b) Periodic wave c) Non periodic
wave d) All of the above
5.If ‘θ’ is the angle
between two vectors then dot product of the two vectors contains the term.
[a ]
a) cosθ b) sinθ
c)
tanθ
d)
secθ
6. In a set of signals, if no
signal can be represented as a linear combination of the remaining signals,
then such signals are [a ]
( a ) linearly independent ( b ) linearly dependent
( c ) orthonormal ( d ) orthogonal
7. In the trigonometric Fourier
series representation of a signal a0 is the [d ]
( a ) RMS value ( b ) peak value ( c ) mean square
value ( d ) average value
8. Graphical representation of a
signal in time domain is called___ [b
]
a)spectrum b) waveform c) both a&b d) none
9. The signal Acos(wt+ø) is
a/an______signal [d ]
a)periodic b) power c) energy d) both a & b
10. The frequency spectrum of a
periodic signal is______ [b ]
a)continuous b) discrete c) periodic d) non-periodic
11. The component of vector v1 on
vector v2 if v1·v2= 0 is_____ [c ]
a)1 b) ∞ c) 0 d)π
SECTION-II:
FILL IN THE BLANKS:
1 . The
sum of two periodic signals will also be periodic if the ratio of their
fundamental periods is a rational number
2 .When
the signal exhibits anti symmetry with respect to t=0 it is called odd signal
3. When
the sign of t is changed in x(t) the resultant signal is called folded
4.
In
fourier series representation of a signal, if w is the fundamental frequency
then nw are called harmonic
frequencies
5. Fourier series is very useful for
frequency domain analysis of periodic signals
6. The plot of magnitude of Cn with respect to “n”
is called magnitude line
spectrum
7. For a signal x(t) the condition to be
satisfied for half wave symmetry is X (t+T/2)=-X(t)
8. For a signal X(t) the condition to be
satisfied for quarter wave symmetry is X (t+T/2)=-X(t) & X(-t)=+X(t)_and
9. A vector is specified by Magnitude & Direction
10. Periodic signals are called the Power Signal
11. If the Fourier series coefficients of a signal are periodic then the
signal must be Discrete-time
periodic
12. The representation of a function x(t) by a set of infinite mutually
orthogonal functions is called Fourier series representation of x(t)
13. The Fourier spectrum exists only at discrete frequencies
14. A continuous time signal is the one in which the independent
variable is continuous
15. Let two signals f1(t) & f2(t) are orthogonal over the interval
(t1,t2). Magnitude of the component of f1(t) in f2(t) is ZERO
16. Time period (T) of the
periodic signal x(t)=cos2 t + sin5 t is 2
17. If x(-t)=x(t), then x(t) is an even signal.
Prepared By
Arvind chary