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Sampling Theorem Quiz | Sampling Theorem Multiple Choice Questions and Answers

Questions
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

Answer: All of the above
2 Sine wave is a
A Periodic signal
B Deterministic signal
C Aperiodic signal
D Both a and c

Answer: Periodic signal
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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

Answer: 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

Answer: Both a and b
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

Answer: 400 Hz
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

Answer: 300Hz
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

Answer: 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

Answer: 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

Answer: Natural sampling
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

Answer: f(x) = f(-x)
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

Answer: 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

Answer: fs ≥ 2fm
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

Answer: fs < 2fm
17 The techniques used for sampling are
A Flat top sampling
B Instantaneous sampling
C Natural sampling
D All of the above

Answer: 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

Answer: 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

Answer: Both a and b

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