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WorksheetsSignals&Systmes Home Work1
Total questions: 20
Worksheet time: 8mins
Which mathematical notation specifies the condition of periodicity for a continuous time signal?
x(t) = x(t +T0)
x(n) = x(n+ N)
x(t) = e-αt
None of the above
Which property of delta function indicates the equality between the area under the product of function with shifted impulse and the value of function located at unit impulse instant?
Replication
Sampling
Scaling
Product
Damped sinusoids are _____
sinusoid signals multiplied by growing exponentials
sinusoid signals divided by growing exponentials
sinusoid signals multiplied by decaying exponentials
.sinusoid signals divided by decaying exponentials
Which of the following signals are monotonic in nature?
1-exp(-t)
1-exp(sin(t))
log(tan(t))
cos(t)
What is the period of the following signal, x(t) = sin(18*pi*t + 78 deg)?
1⁄9
2⁄9
1⁄3
4⁄9
For the signal, x(t) = log(cos(a*pi*t+d)) for a = 50 Hz, what is the time period of the signal, if periodic?
0.16s
0.08s
0.12s
0.04s
A signal is a physical quantity which does not vary with ____________
Time
Space
Independent Variables
Dependent Variables
Most of the signals found in nature are _________
Continuous-time and discrete-time
Continuous-time and digital
Digital and Analog
Analog and Continuous-time
Which one of the following is not a characteristic of a deterministic signal?
Exhibits no uncertainty
Instantaneous value can be accurately predicted
Exhibits uncertainty
Can be represented by a mathematical equation
Determine the Time period of: x(t)=3 cos(20t+5)+sin(8t-3).
1/10 sec
1/20 sec
2/5 sec
2/4 sec
Determine the odd component of the signal: x(t)=cost+sint.
sint
2sint
cost
2cost
For an energy signal __________
E=0
P= ∞
E= ∞
P=0
Determine the power of the signal: x(t) = cos(t).
1/2
1
3/2
2
Discrete time signal is derived from continuous time signal by _____________ process.
Addition
Multiplying
Sampling
Addition and multiplication
Even signals are symmetric about the vertical axis.
True
False
If x (-t) = -x (t) then the signal is said to be _____________
Even signal
Odd signal
Periodic signal
Non periodic signal
When x(t ) is said to be non periodic signal?
If the equation x (t) = x (t + T) is satisfied for all values of T
If the equation x (t) = x (t + T) is satisfied for only one value of T
If the equation x (t) = x (t + T) is satisfied for no values of T
If the equation x (t) = x (t + T) is satisfied for only odd values of T
Noise generated by an amplifier of radio is an example for?
Discrete signal
Deterministic signal
Random signal
Periodic signal
Energy signal has zero average power and power signal has zero energy.
True
False
Which of the following is an example of amplitude scaling?
Electronic amplifier
Electronic attenuator
Both amplifier and attenuator
Adder
