FREE Bachelor of Electrical Engineering Signals & Systems Questions and Answers

Question 1

The majority of the signals in nature are .

Accepted Answer

Analog and Continuous-time

Answer

Most physical phenomena and natural signals, such as sound, temperature, or light, vary smoothly and continuously over time and can take on any value within a range. These characteristics define them as analog signals and continuous-time signals. Digital signals are discrete representations derived from these continuous natural signals.

Question 2

Which of the following traits does not apply to deterministic signals?

Accepted Answer

Exhibits uncertainty

Answer

Deterministic signals are characterized by their predictability; their future values can be precisely determined from a mathematical model or their past values, exhibiting no uncertainty. They can be represented by a specific mathematical equation, allowing their instantaneous value to be accurately predicted. Signals that exhibit uncertainty are classified as random or stochastic.

Question 3

When the ratio of the time periods of two periodic signals is ____________, the sum of the signals is a periodic signal.

Accepted Answer

A rational number

Answer

The sum of two periodic signals, with periods T1 and T2, will itself be a periodic signal if and only if the ratio of their periods (T1/T2) is a rational number. If this condition is met, a common fundamental period can be found for the combined signal. If the ratio is irrational, the sum of the signals will be aperiodic.

Question 4

Among the following signals, which one is monotonous in nature?

Accepted Answer

1-exp(-t)

Answer

A monotonous function is one that is either consistently non-decreasing or consistently non-increasing over its entire domain. For t ≥ 0, the function 1-exp(-t) is monotonically increasing because its derivative, exp(-t), is always positive. The other functions listed exhibit oscillatory or non-uniform behavior, preventing them from being monotonous over their typical domains.

Question 5

Is the integral of the function from -infinity to +infinity for a bounded function defined and finite?

Accepted Answer

Not always

Answer

While a bounded function has values that do not go to infinity, its integral over an infinite range (from -infinity to +infinity) is not always defined and finite. For the integral to be finite, the function must be absolutely integrable, meaning the integral of its absolute value must converge. Many bounded functions, like f(x) = 1, have infinite integrals over an infinite range.

BEE - Bachelor of Electrical Engineering Practice Test

BEE - Bachelor of Electrical Engineering Practice Test

FREE Bachelor of Electrical Engineering Signals & Systems Questions and Answers