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Introduction to Linear Time Invariant Systems

February 2, 2019 by 3200 Creative

Introduction to Linear Time Invariant Systems

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Question 1 of 3

1. Question
If the input to a linear system is doubled, what happens to the output?
- the output is not changed
- the output is doubled
- the output is scaled by a factor of the square root of 2
- none of the other choices is correct
- the output changes sign
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Question 2 of 3

2. Question
Which of the following systems can be well approximated as time invariant
- a human, viewed as a “system” that receives sensory inputs and food/water as inputs, and produces complex outputs such as bicycling, writing quizzes, and cheering for a football team.
- an MP3 player
- a well-calibrated scale for weighing items
- the system that computes output $y[n]$ from input $x[n]$ according to the formula $y[n] = n x[n]$
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Question 3 of 3

3. Question
Which of the following is true of a time-invariant system? (select all that apply)
- If you double the input signal amplitude, the output signal amplitude doubles.
- Time-invariant systems are always linear.
- The system characteristics are the same now as in the future.
- The system characteristics can change with time.
- If an input $x[n]$ produces an output $y[n]$ , then $x[n-2]$ produces $y[n-2]$ .
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