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Unit 1: Introduction to Signals - Practice Quiz

ECE220 — Signal And Systems 60 Questions
0 Correct 0 Wrong 60 Left
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1 A signal defined for all values of time over a continuous interval is called a:

Continuous time and discrete time signals : energy and power signals Easy
A. Digital signal
B. Discrete-time signal
C. Continuous-time signal
D. Quantized signal

2 A discrete-time signal is usually represented as:

Continuous time and discrete time signals : energy and power signals Easy
A.
B.
C.
D.

3 A signal with finite energy and zero average power is classified as a(n):

Continuous time and discrete time signals : energy and power signals Easy
A. Random signal
B. Periodic signal
C. Energy signal
D. Power signal

4 A signal with finite non-zero average power is called a(n):

Continuous time and discrete time signals : energy and power signals Easy
A. Aperiodic signal
B. Impulse signal
C. Power signal
D. Energy signal

5 The energy of a continuous-time signal is defined as:

Continuous time and discrete time signals : energy and power signals Easy
A.
B.
C.
D.

6 A signal is periodic if there exists a period such that:

Transformations of the independent variable : periodic signals, even and odd signals Easy
A. for all
B. for all
C. for all
D. for all

7 A signal that satisfies is said to be:

Transformations of the independent variable : periodic signals, even and odd signals Easy
A. Causal
B. Periodic
C. Odd
D. Even

8 A signal that satisfies is said to be:

Transformations of the independent variable : periodic signals, even and odd signals Easy
A. Bounded
B. Odd
C. Even
D. Deterministic

9 The operation represents a:

Transformations of the independent variable : periodic signals, even and odd signals Easy
A. Time scaling
B. Time shift (delay)
C. Time reversal
D. Amplitude scaling

10 The signal is an example of a(n):

Transformations of the independent variable : periodic signals, even and odd signals Easy
A. Aperiodic signal
B. Odd signal
C. Even signal
D. Neither even nor odd

11 The general form of a continuous-time real exponential signal is:

Exponential and sinusoidal signals Easy
A.
B.
C.
D.

12 For the exponential with , the signal is:

Exponential and sinusoidal signals Easy
A. Constant
B. Oscillating
C. Growing
D. Decaying

13 Euler's relation expresses as:

Exponential and sinusoidal signals Easy
A.
B.
C.
D.

14 The fundamental period of the sinusoid is:

Exponential and sinusoidal signals Easy
A.
B.
C.
D.

15 The continuous-time unit step function is equal to:

The unit impulse and unit step functions Easy
A. for and for
B. for
C. for and for
D. for all

16 The area under the continuous-time unit impulse is:

The unit impulse and unit step functions Easy
A.
B.
C.
D.

17 The discrete-time unit impulse equals when:

The unit impulse and unit step functions Easy
A.
B.
C.
D.

18 The unit impulse is related to the unit step by which operation?

The unit impulse and unit step functions Easy
A.
B.
C.
D.

19 The operation performed on a signal is called:

Operations on signals Easy
A. Time scaling
B. Time reversal
C. Amplitude scaling
D. Time delay

20 In MATLAB, which function is commonly used to plot a discrete-time signal as stems?

Software Simulation of Basic Operations on Elementary Signals Easy
A. stem
B. bar
C. plot
D. surf

21 For the signal , what is the total energy?

Continuous time and discrete time signals : energy and power signals Medium
A.
B.
C.
D.

22 A signal is classified as which type?

Continuous time and discrete time signals : energy and power signals Medium
A. Power signal with power
B. Power signal with power
C. Energy signal with energy
D. Neither energy nor power signal

23 The energy of the discrete-time signal is:

Continuous time and discrete time signals : energy and power signals Medium
A.
B.
C.
D.

24 The fundamental period of is:

Transformations of the independent variable : periodic signals Medium
A. s
B. s
C. s
D. s

25 For the discrete-time signal to be periodic, its fundamental period is:

Transformations of the independent variable : periodic signals Medium
A.
B.
C.
D.

26 The signal is periodic with fundamental period:

Transformations of the independent variable : periodic signals Medium
A.
B.
C.
D.

27 The even part of the signal is:

even and odd signals Medium
A.
B.
C.
D.

28 If is an odd signal, then the value of must be:

even and odd signals Medium
A. Any nonzero constant
B.
C.
D.

29 The odd part of is:

even and odd signals Medium
A.
B.
C.
D.

30 The complex exponential represents which behavior?

Exponential and sinusoidal signals Medium
A. A pure undamped sinusoid
B. A constant DC signal
C. A sinusoid with exponentially growing amplitude
D. A sinusoid with exponentially decaying amplitude

31 For the discrete-time signal , as the signal:

Exponential and sinusoidal signals Medium
A. Remains constant at
B. Decays toward zero
C. Oscillates with constant amplitude
D. Grows without bound

32 The signal has an angular frequency of:

Exponential and sinusoidal signals Medium
A. rad/s
B. rad/s
C. rad/s
D. rad/s

33 The value of the integral is:

The unit impulse and unit step functions Medium
A.
B.
C.
D.

34 The relationship between the continuous-time unit step and unit impulse is:

The unit impulse and unit step functions Medium
A.
B.
C.
D.

35 In discrete time, the unit step can be expressed in terms of the unit impulse as:

The unit impulse and unit step functions Medium
A.
B.
C.
D.

36 Given defined for , the signal is defined over which interval?

Operations on signals Medium
A.
B.
C.
D.

37 To obtain from , the correct order of operations is:

Operations on signals Medium
A. Time scaling by 3, then reversal
B. Shift right by 3, then scaling
C. Time reversal, then shift right by 3
D. Shift left by 3, then time reversal

38 The operation applied to a signal represents:

Operations on signals Medium
A. Time expansion by a factor of 3
B. Amplitude scaling by 3
C. A time shift by 3 units
D. Time compression by a factor of 3

39 In MATLAB, to generate a discrete unit impulse over the range , which approach is correct?

Software Simulation of Basic Operations on Elementary Signals Medium
A. n=-5:5; x=ones(size(n));
B. n=-5:5; x=(n==0);
C. n=-5:5; x=(n~=0);
D. n=-5:5; x=(n>=0);

40 When simulating signal addition of two discrete sequences with different index ranges, the essential first step is to:

Software Simulation of Basic Operations on Elementary Signals Medium
A. Reverse one of the sequences
B. Align both sequences over a common index range using zero padding
C. Multiply the sequences element by element
D. Convolve the two sequences

41 Consider the signal . Classify the signal based on energy and power.

Continuous time and discrete time signals : energy and power signals Hard
A. Neither energy nor power signal
B. Energy signal with
C. Energy signal with
D. Power signal with

42 For the discrete-time signal , the total energy is:

Continuous time and discrete time signals : energy and power signals Hard
A.
B.
C.
D.

43 The signal is:

Continuous time and discrete time signals : energy and power signals Hard
A. An energy signal with
B. A power signal with
C. An energy signal with infinite energy
D. A power signal with

44 For (discrete unit step), the average power is:

Continuous time and discrete time signals : energy and power signals Hard
A.
B.
C.
D.

45 The signal is periodic with fundamental period:

Transformations of the independent variable : periodic signals Hard
A.
B.
C.
D. Not periodic

46 The sum of two periodic continuous-time signals with periods and has fundamental period:

Transformations of the independent variable : periodic signals Hard
A.
B.
C.
D. Not periodic

47 The signal is periodic with fundamental period:

Transformations of the independent variable : periodic signals Hard
A.
B.
C.
D. Not periodic

48 The discrete signal (argument in radians) is:

Transformations of the independent variable : periodic signals Hard
A. Periodic with period
B. Periodic with period
C. Periodic with period
D. Aperiodic because is irrational

49 The odd part of is:

even and odd signals Hard
A.
B.
C.
D.

50 If is real and odd, then equals:

even and odd signals Hard
A.
B.
C. Cannot be determined
D.

51 The even part of (unit step) is:

even and odd signals Hard
A.
B. for all
C.
D.

52 For the complex exponential , the signal is:

Exponential and sinusoidal signals Hard
A. A real decaying exponential
B. A decaying oscillation (damped sinusoid)
C. A growing oscillation
D. A pure sinusoid of constant amplitude

53 Two discrete-time sinusoids and are identical if and differ by:

Exponential and sinusoidal signals Hard
A. An integer multiple of
B. An integer multiple of
C. Any rational number
D. An integer multiple of

54 The highest rate of oscillation for a discrete-time sinusoid occurs at:

Exponential and sinusoidal signals Hard
A.
B.
C.
D.

55 Evaluate .

The unit impulse and unit step functions Hard
A.
B.
C.
D.

56 The relationship between the discrete unit impulse and unit step is:

The unit impulse and unit step functions Hard
A.
B.
C.
D.

57 The derivative of the ramp function is:

The unit impulse and unit step functions Hard
A.
B.
C.
D.

58 Given defined for , the signal is nonzero over:

Operations on signals Hard
A.
B.
C.
D.

59 To obtain from , the correct order of operations is:

Operations on signals Hard
A. Compress by 2, then shift right by 2
B. Shift right by 2, then compress by 2
C. Compress by 2, then shift left by 4
D. Shift right by 4, then compress by 2

60 In MATLAB, to generate a time-reversed and shifted signal from a vector x defined over n = -2:2, the correct approach is:

Software Simulation of Basic Operations on Elementary Signals Hard
A. Multiply x by and shift by 2
B. Use circshift(x,2) only
C. Flip the vector x and adjust the time index to -(n)+2
D. Simply use fliplr(x) without changing the index range
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Unit 2