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Free download in PDF Sampling Theorem Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
A periodic signal is
[A]
Repeats itself at regular intervals
[B]
May be represented by g(t) = g(t + T0)
[C]
Value may be determined at any point
[D]
All of the above
(2)
Sine wave is a
[A]
Periodic signal
[B]
Deterministic signal
[C]
Aperiodic signal
[D]
Both a and c
(3)
In Unit impulse function
[A]
Height of pulse goes to infinity
[B]
Area of pulse curve is unity
[C]
Pulse width is zero
[D]
All of the above
(4)
For a Unit ramp function area of pulse curve is unity
[A]
Starts at time t=0 and linearly increases with t
[B]
Discontinuous at time t=0
[C]
Both a and b
[D]
None of the above
Answer: Starts at time t=0 and linearly increases with t
(5)
The desired signal of maximum frequency wm centered at frequency w=0 may be recovered if
[A]
Filter has the cut off frequency wm
[B]
The sampled signal is passed through low pass filter
[C]
Both a and b
[D]
None of the above
(6)
Calculate the minimum sampling rate to avoid aliasing when a continuous time signal is given by x(t) = 5 cos 400πt
[A]
400 Hz
[B]
250 Hz
[C]
100 Hz
[D]
None of the above
(7)
Calculate the Nyquist rate for sampling when a continuous time signal is given by
x(t) = 5 cos 100πt +10 cos 200πt – 15 cos 300πt
[A]
300Hz
[B]
150Hz
[C]
600Hz
[D]
None of the above
(8)
A low pass filter is
[A]
Is used to recover signal from sampled signal
[B]
Passes the frequencies lower than the specified cut off frequency
[C]
Rejects higher frequencies
[D]
All of the above
(9)
The instantaneous sampling
[A]
Has the negligible power content
[B]
Has a train of impulses
[C]
Has the pulse width approaching zero value
[D]
All of the above
(10)
The sampling technique having the minimum noise interference is
[A]
Natural sampling
[B]
Flat top sampling
[C]
Instantaneous sampling
[D]
None of the above
(11)
Superposition of signals in a linear system refers to the
[A]
Output that is product of all the signals
[B]
Output that is sum of all the signals
[C]
Output that is of highest amplitude of all the signals
[D]
Output that is of largest spectrum of all the signals
Answer: Output that is sum of all the signals
(12)
Random signals is
[A]
May be specified in time
[B]
Occurrence is random
[C]
Repeat over a period
[D]
None of the above
Answer: Occurrence is random
(13)
An even function f(x) for all values of x and x holds
[A]
f(x) = f(-x)
[B]
f(x) = f(x)f(-x)
[C]
f(x) = -f(x)
[D]
None of the above
(14)
Unit step function is
[A]
Exists only for positive side
[B]
Is zero for negative side
[C]
Discontinuous at time t=0
[D]
All of the above
(15)
The spectrum of the sampled signal may be obtained without overlapping only if
[A]
fs ≥ 2fm
[B]
fs < fm
[C]
fs < 2fm
[D]
fs > fm
(16)
A distorted signal of frequency fm is recovered from a sampled signal if the sampling frequency fs is
[A]
fs < 2fm
[B]
fs ≥ 2fm
[C]
fs > 2fm
[D]
fs = 2fm
(17)
The techniques used for sampling are
[A]
Flat top sampling
[B]
Instantaneous sampling
[C]
Natural sampling
[D]
All of the above
(18)
Types of analog pulse modulation systems are
[A]
Pulse amplitude modulation
[B]
Pulse time modulation
[C]
Frequency modulation
[D]
Both a and b
(19)
In pulse amplitude modulation,
[A]
Amplitude of the pulse train is varied
[B]
Width of the pulse train is varied
[C]
Frequency of the pulse train is varied
[D]
None of the above
Answer: Amplitude of the pulse train is varied
(20)
Pulse time modulation (PTM) includes
[A]
Pulse width modulation
[B]
Pulse position modulation
[C]
Pulse amplitude modulation
[D]
Both a and b
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