Signals and Systems
Signals
Practice questions from Signals.
14
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IncorrectThe radian frequency value(s) for which the discrete time sinusoidal signal
has a period of 40 is/are__________.
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Sign in to UnlockConsider the signal ,
where t is in seconds. Its fundamental time period, in seconds, is ________
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Sign in to UnlockThe waveform of a periodic signal x(t) is shown in the figure.
A signal g(t) is defined by .
The average power of g(t) is _______.
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Sign in to UnlockThe impulse response of an LTI system can be obtained by
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Sign in to UnlockTwo sequences and have the same energy. Suppose, where α is a positive real number and u[n] is the unit step sequence.
Assume for
Then the value of α is _________.
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Sign in to UnlockA discrete-time signal, n being an integer, is
a periodic with period π.
periodic with period
periodic with period π/2.
not periodic.
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Sign in to UnlockFor a periodic signal ,
the fundamental frequency in rad/s is
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Sign in to UnlockA function is given by .
Which of the following is true?
f has frequency components at 0 and Hz
f has frequency components at 0 and Hz
f has frequency components at and Hz
f has frequency components at 0 , and Hz
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Sign in to UnlockThe Dirac delta function is defined as
and
and
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Sign in to UnlockThe function x(t) is shown in figure. Even and odd parts of a unit-step function u(t) are respectively.
,
,
,
,
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Sign in to UnlockConsider the sequence.
The conjugate anti-symmetric part of the sequence is
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Sign in to UnlockLet denote the delta function.
The value of the integral is
1
-1
0
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Sign in to UnlockIf a signal f(t) has energy E, the energy of the signal f(2t) is equal to
E
2E
4E
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Sign in to UnlockWhich of the following signals is/are periodic?
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