# Signals & Systems : 100 Most Important Questions with Solutions

By Vishnu Pratap Singh|Updated : February 17th, 2022

You have completed the syllabus of the SSC exam for Signals & Systems. Now BYJU'S Exam Prep brings you the 100 most important questions of the Signals & Systems

Here you will find the100  most important questions for the Signals & Systems subject of the Electrical  Engineering syllabus. The top questions are attached here rest questions you can find in the below pdf.

## PDF OF 100 MOST IMPORTANT QUESTIONS OF              Signal and systems

You have completed the syllabus of the SSC exam for Signals & Systems. Now BYJU'S Exam Prep brings you the 100 most important questions of the Signals & Systems

Here you will find the100  most important questions for the Signals & Systems subject of the Electrical  Engineering syllabus. The top questions are attached here rest questions you can find in the below pdf.

## PDF OF 100 MOST IMPORTANT QUESTIONS OF              Signal and systems

1. If the Nyquist rate for the signal x(t) is 2ω0. Then the Nyquist rate for signal x(t) cosω0t
isA. ω0 B. 2ω0
C. 3ω0 D. 4ω0
Ans. D
Sol:(Because NR is twice the maximum frequency)
Maximum frequency present in the signal [x(t) cosω0t] is = (ω0 + ω0) = 2ω0
So, NR (Nyquist rate) for the signal x(t)cosω0t = 4ω0

Which one most appropriate dynamic system?
A.
y(n) y(n 1) y(n 1) + − + +
B.
y(n) y(n 1) + −
C.
y(n) y(n 1) y(n 3) 0 + − + + =
D. all of the above
Ans. D

A signal
=  x (t) 20 cos(200 t) 1
is sampled at 150 Hz and
=  x (t) 20 cos(100 t) 2
is sampled at fs. What is the value of fs so that both the sequences of samples will be identical?
A. 50 Hz B. 200 Hz
C. 150 Hz D. 100 Hz
Ans. C

One complex multiplication takes 2μs and assume that the amount of time it takes to
perform all of the multiplications. Then the time is taken to compute a 512 points DFT is?
A. 0.52 s
B. 0.26 s
C. 0.78 s
D. 1.04 s
Ans. A
Sol.: N-point DFT requires N2 complex multiplications.
Time taken = (512)2 × 2 × 10–6 s = 0.52 s

Which of the following is a non-causal system?
A. y(t) = 2x(t) + dx(t)/dt B. y(t) = x(t) – x(t –1)
C. y(t) = t.x(t) D. y(t) = x(t) + 2x(3 – t)

PDF OF 100 MOST IMPORTANT QUESTIONS OF Signal and Systems

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