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WorksheetsFinal Examination: Signal, Spectra and Signal Processing
Total questions: 60
Worksheet time: 34mins
________ is the disadvantage of digital signal processing
Flexible in operation
Speed of operation is limited
Speed of operation is unlimited
None of the above
The difference between quantized and unquantized is called quantization ______
Error
Coefficient
Ratio
None of the above
The system given by y(n) = x(n) + 1/x(n - 1) is:
Linear
Causal
Both (a) and (b
None of the above
Which signal is non-periodic?
Power signal
Energy signal
Both a and b
None of the above
What is the time period of a periodic signal in actual terms?
The signals which start at t=-∞ and end at t=+∞
The signals which have a finite interval of occurrence
The signals which start at t= -∞ and ends at a finite time period
The signals which have a short period of occurrence
How can we generate a periodic signal from a periodic signal itself
By extending a signal with duration T
Cannot be extended
By extending the periodic signal’s amplitude
By extending the signal with duration 2π
When a continuous signal is mixture of two continuous periodic signals, what is its periodicity?
LCM of the periods of the two signals, provide their ratio is unity
LCM of the periods of the two signals, provide their ratio is rational
HCF of the periods of the two signals, provide that the ratio is rational
LCM of the periods of the two signals their ratio is real
What is the area of a periodic signal in a periodic interval?
It depends on the situation
It is same as the area in the previous interval
It is different in different situations
It is square of the fundamental period
What is necessary and sufficient condition for a sum of a periodic continuous time signal to be periodic?
Ratio of period of the first signal to period of other signals should be constant
Ratio of period of the first signal to period of other signals should be finite
Ratio of period of the first signal to period of other signal should be rea
Ratio of period of first signal to period of other signal should be rational
A discrete time signal is as given below
X[n]=cos πn/9+sin(πn/7+12)
The period of the signal X [n] is ______________
126
32
252
Non periodic
Prove that the following condition of discrete system is CAUSAL or NON CAUSAL. Send your solution thru messenger for your solution.
Causal
Non Causal
Both A and B
None of the above
The discrete-time always indicated with n
True
False
Whenever the amplitude of step function is more than one then that is called as ___________ signal
Unit
Step
Impulse
None of the above
The continuous-time always indicated with t
True
False
How many inputs does the system have?
Only one
Only two
One or more inputs
None of the above
Signal is a _________
Time variant
It is a physical phenomenon
Conveys information
All of the above
________ are the examples of signal
Human voice
Electrical signals
Voltage on telephone wires
All of the above
The inputs of the system are called _____
Excitation
Response
Both a and b
None of the above
In a ______ signal, we can define the value of the signal at any instant of time?
Continuous
Discrete
Both a and b
None of the above
In a _________ signal, we can’t define the value of the signal at any instant of time?
Continuous
Discrete
Both a and b
None of the above
How many outputs does the system have?
Only one
Only two
One or more outputs
None of the above
The outputs of the system are called ________
Excitation
Response
Both a and b
None of the above
A __________ is an example of the system
Communication system
Oscilloscopes
Modem
All of the above
The system that accepts the input in the discrete form and produces the discrete time output is known as:
Linear system
Discrete time system
LTI system
All of the above
The analog signals are categorized into ________
1
2
3
4
The technique where processing is done on an analog signal is nothing but ______
Analog
Digital
Mixed
None of the above
The most convenient and accurate signal processing technique is _____
Analog
Digital
Mixed
None of the above
The advantages of digital signal processing are
Flexible in operation
It is a stable system
Low cost
All of the above
Analog signals convert into digital signal using
Sampling
Quantization
Both a and b
None of the above
What is necessary and sufficient condition for a sum of a periodic continuous time signal to be periodic?
Ratio of period of the first signal to period of other signals should be constant
Ratio of period of the first signal to period of other signals should be finite
Ratio of period of the first signal to period of other signal should be real
Ratio of period of first signal to period of other signal should be rational
1. What is a fundamental period?
Every interval of a periodic signal
Every interval of an aperiodic signal
The first interval of a periodic signal
The last interval of a periodic signal
The advantages of discrete signal processing is/are:
Cost effective
Time sharing
High flexibility
All of the above
1. Which of the following is the characteristic of the power signal?
Power signal is infinite.
Power signals are time limited.
Aperiodic signals are power signals.
None of the above
The product of two odd signals is:
Odd
Even
Odd and Even
None of the above
The signals are categorized into ________ based on reflection
1
2
3
4
The discrete-time signals are categorized into __________
1
2
3
4
The speech signal is obtained after
Digital to Analog conversion
Analog to digital conversion
Quantization
Modulation
What is the time period of a periodic signal in actual terms?
The signals which have a finite interval of occurrence
The signals which start at t= -∞ and ends at a finite time period
The signals which start at t=-∞ and end at t=+∞
The signals which have a short period of occurrence
What is a fundamental angular frequency?
The inverse of the fundamental time period
The inverse of the fundamental frequency
Fundamental frequency in radians
Fundamental frequency in degrees
How many types of signals are there?
1
2
3
4
Is the system y(t) = Rx(t), where R is a arbitrary constant, a memoryless system?
Yes
No
Does the following discrete system have the parameter of memory, y[n] = x[n-1] + x[n] ?
Yes
No
y[t]= ∫x[t],t ranges from 0 to t. Is the system a memoryless one?
Yes
No
Both memoryless and having memory
None of the Mentioned
y(t) = sin(x(t-1)) : Comment on its memory aspects.
Having memory
Needn’t have memory
Memoryless system
Time invariant system
Comment on the causality of y[n] = x[-n].
Time invariant
Causal
Non causal
Time varying
y(t) = x(t-2) + x(2-t). Comment on its causality:
Causal
Time variant
Non causal
All of the mentioned
Comment on the linearity of y[n] = n*x[n].
Linear
Only additive
Not scalable
Non linear
Comment on the causality of y[n] = n*x[n].
Time invariant
Time varying
Time varying
Causal
An example of a discrete set of information/system is
the trajectory of the Sun
data on a CD
universe time scale
movement of water through a pipe
A system which is linear is said to obey the rules of
scaling
additivity
both scaling and additivity
None of the above
A time invariant system is a system whose output
increases with a delay in input
decreases with a delay in input
remains same with a delay in input
vanishes with a delay in input
Should real time instruments like oscilloscopes be time invariant?
Yes
Sometimes
Never
They have no relation with time variance
All real time systems concerned with the concept of causality are
non causal
causal
neither causal nor non causal
memoryless
A system is said to be defined as non causal, when
the output at the present depends on the input at an earlier time
the output at the present does not depend on the factor of time at all
the output at the present depends on the input at the current time
the output at the present depends on the input at a time instant in the future
When we take up design of systems, ideally how do we define the stability of a system?
A system is stable, if a bounded input gives a bounded output, for some values of the input
A system is unstable, if a bounded input gives a bounded output, for all values of the input
A system is stable, if a bounded input gives a bounded output, for all values of the input
A system is unstable, if a bounded input gives a bounded output, for some values of the input
All causal systems must have the component of
memory
time invariance
stability
linearity
Amplifiers, motors, filters etc. are examples for which type of system?
Distributed parameter systems
Unstable systems
Discrete time systems
Continuous time systems
Which among the following systems are described by partial differential functions?
Causal Systems and Dynamic systems
Distributed parameter systems and linear systems
Distributed parameter systems and Dynamic systems
Causal systems and linear systems
Which one of the following systems is causal?
y(t)=x(t)+x(t-3)+x(t2)
y(n)=x(n+2)
y(t)=x(t-1)+x(t-2)
y(n)=x(2n2)
Which one of the following is an example of a bounded signal?
et coswt
et sinw(-t)
e-t coswt
et cosw(-t)
