Signal Definition: A Comprehensive Guide for Electrical Engineering Students

Question 1

Of the following, which is NOT a characteristic of a signal?

Accepted Answer

Modeling as a constant function

Answer

Conveyance of information over time or space

Answer

Representation as a graph

Answer

Existence in continuous or discrete form

Question 2

A signal defined over a continuous time domain is known as a:

Accepted Answer

Analog signal

Answer

Discrete signal

Answer

Digital signal

Answer

Periodic signal

Question 3

Which of these signals is periodic?

Accepted Answer

Sinusoidal signal

Answer

Impulse signal

Answer

Step signal

Answer

Random signal

Question 4

A signal that assumes only a finite number of values is called a:

Accepted Answer

Discrete signal

Answer

Continuous signal

Answer

Analog signal

Answer

Periodic signal

Question 5

A signal that is zero everywhere except for a single instant in time is known as a:

Accepted Answer

Impulse signal

Answer

Step signal

Answer

Ramp signal

Answer

Sine wave

Question 6

A signal representing an object's velocity is considered a:

Accepted Answer

Vector signal

Answer

Scalar signal

Answer

Complex signal

Answer

Random signal

Question 7

The mathematical notation for the unit impulse signal is:

Accepted Answer

δ(t)

Answer

u(t)

Answer

exp(t)

Answer

sin(t)

Question 8

Improved: Which of the following is NOT a defining characteristic of a signal?

Accepted Answer

Modified: It is always represented in both the time and frequency domains.

Answer

It conveys information over time or space.

Answer

It can exist in either continuous or discrete form.

Answer

It can be either periodic or non-periodic.

Question 9

Improved: Which of the following is NOT considered a continuous signal type?

Accepted Answer

Revised: Impulse function

Answer

Sine wave

Answer

Square wave

Answer

Ramp signal

Question 10

Improved: What is the Nyquist sampling rate most accurately defined as?

Accepted Answer

Revised: The minimum sampling frequency required to prevent aliasing.

Answer

The maximum sampling frequency that can be used without distorting the signal.

Answer

The rate at which a signal is sampled to guarantee its accurate reconstruction.

Answer

The rate at which a signal is recreated from its sampled data.

Question 11

Improved: How is a signal represented in the time domain when it undergoes a constant time delay?

Accepted Answer

Revised: As a shifted version of its original form.

Answer

As a scaled version of its original form.

Answer

As an inverted version of its original form.

Answer

As a distorted version of its original form.

Question 12

For a continuous-time periodic signal, the relationship between its average power and energy per period is:

Accepted Answer

Average power equals energy per period.

Answer

Average power is half of energy per period.

Answer

Average power is double of energy per period.

Answer

Average power is unrelated to energy per period.

Question 13

In the frequency domain, which operation corresponds to multiplying two continuous-time signals, x(t) and h(t), in the time domain?

Accepted Answer

Convolution

Answer

Addition

Answer

Division

Question 14

Improved: Which of the following is NOT considered a key property of a signal?

Accepted Answer

Revised: Resolution

Answer

Amplitude

Answer

Frequency

Answer

Causality

Question 15

Improved: The process of converting an analog signal into a digital signal is accurately termed:

Accepted Answer

Revised: Analog-to-digital conversion (ADC)

Answer

Modulation

Answer

Quantization

Answer

Encoding

Question 16

Improved: Which of the following statistical measures represents the signal's average value over time?

Accepted Answer

Revised: Mean

Answer

Variance

Answer

Standard deviation

Answer

Energy

Question 17

Improved: A signal that maintains a constant value over time is classified as a:

Accepted Answer

Revised: DC signal

Answer

AC signal

Answer

Periodic signal

Answer

Non-periodic signal

Question 18

Which mathematical operation is used to decompose a signal into its frequency components?

Accepted Answer

Fourier transform

Answer

Convolution

Answer

Laplace transform

Answer

Z-transform

Question 19

A signal that repeats itself at regular intervals of time is termed as:

Accepted Answer

Periodic signal

Answer

Non-periodic signal

Answer

Continuous-time signal

Answer

Discrete-time signal

Question 20

The bandwidth of a signal signifies its:

Accepted Answer

Range of frequencies it occupies

Answer

Average power it carries

Answer

Time duration it spans

Answer

Amplitude it reaches

Question 21

A signal that is not constrained or limited in bandwidth is known as a:

Accepted Answer

Wideband signal

Answer

Narrowband signal

Answer

Baseband signal

Answer

Passband signal

Question 22

How does noise affect a signal's properties?

Accepted Answer

Noise can change the signal's strength and frequency.

Answer

Noise makes a signal more repetitive.

Answer

Noise increases the signal-to-noise ratio (SNR).

Question 23

Which of the following is an example of a real-world application where signals are essential?

Accepted Answer

Self-driving car control systems

Accepted Answer

Medical image processing

Accepted Answer

Mobile device wireless communication

Question 24

A continuous-time signal is one that:

Accepted Answer

Takes on continuous values over time

Answer

Takes on discrete values over time

Answer

Is periodic over time

Answer

Is random over time

Question 25

Which of these is an example of a periodic signal?

Accepted Answer

Sinusoidal wave

Answer

White noise

Answer

Image data

Answer

ECG signal

Question 26

A signal that is defined only at distinct points in time is known as a:

Accepted Answer

Discrete-time signal

Answer

Continuous-time signal

Answer

Periodic signal

Answer

Stochastic signal

Question 27

The Fourier transform converts a signal:

Accepted Answer

From the time domain to the frequency domain

Answer

From the frequency domain to the time domain

Answer

From continuous-time to discrete-time

Answer

From discrete-time to continuous-time

Question 28

The sampling theorem states that a band-limited signal can be perfectly reconstructed if it is sampled at a rate:

Accepted Answer

Equal to or greater than twice the highest frequency component

Answer

Equal to or greater than the highest frequency component

Answer

Twice the highest frequency component

Answer

Half the highest frequency component

Question 29

The impulse response of a system can be defined as:

Accepted Answer

The output of the system when the input is an impulse

Answer

The inverse Fourier transform of the frequency response

Answer

The convolution of the input with the system's kernel

Answer

The cross-correlation of the input with the system's output

Question 30

Which of the following systems is considered non-causal?

Accepted Answer

Delay

Answer

Moving average filter

Answer

Finite impulse response filter

Answer

Infinite impulse response filter

Question 31

What is a common issue that arises from undersampling a signal?

Accepted Answer

Signal distortion

Answer

Signal compression

Answer

Signal enhancement

Answer

Signal normalization

Question 32

What mathematical operation is used to break down a signal into its individual frequency components?

Accepted Answer

Fourier Transform

Answer

Convolution

Answer

Laplace Transform

Answer

Correlation

Question 33

Identify the signal type that exhibits a consistent amplitude over time.

Accepted Answer

Constant signal

Answer

Periodic signal

Answer

Random signal

Question 34

Which characteristic is NOT applicable to a signal?

Accepted Answer

Speed

Answer

Amplitude

Answer

Frequency

Answer

Continuity

Question 35

A signal that repeats itself at regular intervals is known as a:

Accepted Answer

Periodic signal

Answer

Causal signal

Answer

Deterministic signal

Answer

Random signal

Question 36

Which of the following is NOT an application of signals in electrical engineering?

Accepted Answer

Vehicle maintenance

Answer

Communication systems

Answer

Image processing

Answer

Control systems

Question 37

What is the mathematical definition of signal energy?

Accepted Answer

Integral of squared amplitude over all time

Answer

Integral of amplitude over all time

Answer

Maximum amplitude value

Answer

Average amplitude value

Question 38

Which statistical measure quantifies the average value of a signal over time?

Accepted Answer

Mean

Answer

Variance

Answer

Standard Deviation

Answer

Median

Question 39

Which measure quantifies the total energy content of a signal?

Accepted Answer

Signal power

Answer

Signal bandwidth

Answer

Signal variance

Answer

Signal entropy

Question 40

Which signal type is commonly encountered in image processing applications?

Accepted Answer

Multidimensional signals

Answer

Analog signals

Answer

Digital signals

Answer

Unipolar signals

Question 41

In the analysis of discrete-time signals, a crucial concept involves:

Accepted Answer

Sampling theorem

Answer

Phase modulation

Answer

Fourier transform

Answer

Laplace transform

Question 42

Which of the following is NOT a recognized type of noise that can impair signals?

Accepted Answer

Harmonic noise

Answer

Shot noise

Answer

Quantization noise

Answer

White noise

Question 43

When describing the characteristics of a signal, which of the following is NOT included?

Accepted Answer

Constancy

Answer

Frequency

Answer

Power

Answer

Energy

Question 44

A signal that exhibits identical repetition over time is known as:

Accepted Answer

Periodic signal

Answer

Analog signal

Answer

Continuous signal

Answer

Discrete signal

Question 45

The Fourier transform, when applied to a signal, reveals information about its:

Accepted Answer

Frequency components

Answer

Amplitude variations

Answer

Time-domain characteristics

Answer

Phase shifts

Question 46

Identify the continuous-time signal:

Accepted Answer

Sinusoid

Answer

Sampled audio

Answer

Quantized image

Answer

Digital pulse

Question 47

A signal characterized by a finite set of possible values is termed:

Accepted Answer

Discrete signal

Answer

Continuous-time signal

Answer

Analog signal

Question 48

The measure that quantifies the average power carried by a signal is the:

Accepted Answer

Root mean square (RMS) value

Answer

Peak amplitude

Answer

Bandwidth

Answer

Duration

Question 49

The Laplace transform finds application in representing signals in the:

Accepted Answer

Frequency domain

Answer

Time domain

Answer

Space domain

Answer

Phase domain

Question 50

A signal that contains information about the amplitude and phase of its frequency components is called:

Accepted Answer

Complex signal

Answer

Real signal

Answer

Periodic signal

Answer

Imaginary signal