Electronics & Communication MCQs – Signals & Systems (EC Engineering Quiz PDF)

              Electronics & Communication MCQs –   Signals   & Systems (EC Engineering Quiz PDF)

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Boost your exam preparation with our comprehensive Electronics & Communication MCQs on Signals & Systems. This expertly crafted EC Engineering Quiz PDF covers key concepts such as signal types, system properties, Fourier analysis, Laplace transforms, and more—designed specifically for Electronics and Communication Engineering (ECE) students and competitive exams like GATE, IES, and PSU recruitment tests. Download the free Signals & Systems MCQ PDF to practice high-quality, exam-oriented multiple choice questions. Ideal for revision, self-assessment, and time-bound quizzes.

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  • 📘 Electronics & Communication MCQs – Signals & Systems (EC Engineering Quiz PDF)

    Keywords: Signals and Systems MCQ, EC Engineering Quiz, Electronics and Communication MCQs, Signals and Systems PDF, Engineering Exam Preparation, GATE ECE MCQ, Objective Questions Signals and Systems

    📝 Introduction

    Looking to master Signals and Systems for your Electronics & Communication Engineering exams? This curated list of MCQs (Multiple Choice Questions) will help you prepare for competitive exams like GATE ECE, IES, PSUs, and university tests. Download the EC Engineering Quiz PDF at the end for offline practice.

    🔍 Signals & Systems MCQs – Objective Type Questions

    MCQ 1

    Which of the following is a periodic signal?
    A) x(t)=e−tx(t) = e^{-t}
    B) x(t)=cos⁡(3t)x(t) = \cos(3t)
    C) x(t)=tx(t) = t
    D) x(t)=ln⁡(t)x(t) = \ln(t)
    Answer: B

    MCQ 2

    For a signal to be called energy signal, which condition must be satisfied?
    A) Total energy is finite and non-zero
    B) Total power is infinite
    C) Total energy is infinite
    D) Total power is zero
    Answer: A

    MCQ 3

    The convolution of two signals in time domain is equivalent to which operation in frequency domain?
    A) Multiplication
    B) Addition
    C) Differentiation
    D) Division
    Answer: A

    MCQ 4

    Which system property ensures output depends only on present and past inputs, not future inputs?
    A) Time Invariance
    B) Linearity
    C) Causality
    D) Stability
    Answer: C

    MCQ 5

    A system is said to be BIBO stable if:
    A) It has finite bandwidth
    B) It is causal
    C) Every bounded input yields bounded output
    D) Input grows exponentially
    Answer: C

    MCQ 6

    Which of these is a condition for linearity in a system?
    A) Superposition
    B) Causality
    C) Convolution
    D) Differentiability
    Answer: A

    MCQ 7

    Laplace transform is generally used for:
    A) Time-domain analysis
    B) Signal modulation
    C) Frequency domain analysis
    D) Solving differential equations
    Answer: D

    MCQ 8

    The impulse response of an LTI system is given by h(t)h(t). The output for input x(t)x(t) is:
    A) x(t)+h(t)x(t) + h(t)
    B) x(t)⋅h(t)x(t) \cdot h(t)
    C) x(t)∗h(t)x(t) * h(t)
    D) x(t)/h(t)x(t) / h(t)
    Answer: C

    MCQ 9

    Which one of the following represents a non-causal system?
    A) y(t)=x(t)−x(t−2)y(t) = x(t) - x(t-2)
    B) y(t)=x(t)y(t) = x(t)
    C) y(t)=x(t)+x(t+2)y(t) = x(t) + x(t+2)
    D) y(t)=x(t−1)y(t) = x(t-1)
    Answer: C

    MCQ 10

    A system is memoryless if:
    A) Output depends only on current input
    B) Output depends on input derivatives
    C) Output depends on input at t – 1
    D) Output depends on all past inputs
    Answer: A

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    ✅ Final Tips for EC Students

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    Great! Here's the continuation of the "Electronics & Communication MCQs – Signals & Systems (EC Engineering Quiz PDF)" with more original multiple-choice questions to expand your EC Engineering quiz or PDF study material.

    🔍 Signals & Systems MCQs – Continued

    MCQ 11

    Which of the following signals is even?
    A) x(t)=tx(t) = t
    B) x(t)=etx(t) = e^t
    C) x(t)=cos⁡(t)x(t) = \cos(t)
    D) x(t)=sin⁡(t)x(t) = \sin(t)
    Answer: C

    MCQ 12

    A system is time-invariant if:
    A) Output does not change with input
    B) System behavior changes over time
    C) Time shift in input causes identical time shift in output
    D) It has constant gain
    Answer: C

    MCQ 13

    Which transform is best suited for analyzing non-stationary signals?
    A) Laplace Transform
    B) Fourier Transform
    C) Z-Transform
    D) Short-Time Fourier Transform (STFT)
    Answer: D

    MCQ 14

    If x[n]=u[n]x[n] = u[n], where u[n]u[n] is the unit step function, then the DTFT of x[n]x[n] is:
    A) 11−e−jω\frac{1}{1 - e^{-j\omega}}
    B) 11+e−jω\frac{1}{1 + e^{-j\omega}}
    C) ejωe^{j\omega}
    D) δ[n]\delta[n]
    Answer: A

    MCQ 15

    Which of the following properties does not apply to convolution?
    A) Commutative
    B) Associative
    C) Distributive
    D) Derivative
    Answer: D

    MCQ 16

    For a system with impulse response h(t)=δ(t−2)h(t) = \delta(t - 2), the system is:
    A) Memoryless
    B) Causal
    C) Non-causal
    D) Unstable
    Answer: B

    MCQ 17

    The Laplace Transform exists if the signal is:
    A) Periodic only
    B) Absolutely integrable
    C) Bounded only
    D) Linear
    Answer: B

    MCQ 18

    Which of the following pairs are Fourier transform duals?
    A) Time shift and frequency shift
    B) Convolution and multiplication
    C) Scaling and time reversal
    D) Modulation and convolution
    Answer: A

    MCQ 19

    Z-transform is applicable to:
    A) Continuous-time periodic signals
    B) Analog filter design only
    C) Discrete-time signals
    D) None of the above
    Answer: C

    MCQ 20

    Which operation converts a differential equation to an algebraic equation?
    A) Fourier Series
    B) Laplace Transform
    C) Sampling
    D) Autocorrelation
    Answer: B

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    Excellent! Here's the next batch of original Signals and Systems MCQs for Electronics & Communication Engineering (ECE) to extend your PDF or quiz collection.

    🔍 Signals & Systems MCQs – Continued (Set 3)

    MCQ 21

    What is the Fourier Transform of a delta function δ(t)\delta(t)?
    A) 0
    B) 1
    C) Infinity
    D) Undefined
    Answer: B

    MCQ 22

    Which signal has both finite energy and zero average power?
    A) Constant signal
    B) Unit step signal
    C) Finite-duration pulse
    D) Sinusoidal signal
    Answer: C

    MCQ 23

    What is the Laplace Transform of u(t)u(t), the unit step function?
    A) 1s+1\frac{1}{s+1}
    B) 1s\frac{1}{s}
    C) ss+1\frac{s}{s+1}
    D) 0
    Answer: B

    MCQ 24

    Which of the following statements is true about the convolution integral?
    A) Only applicable to discrete systems
    B) Non-commutative
    C) Used to find output of LTI systems
    D) Requires Z-transform
    Answer: C

    MCQ 25

    In frequency domain, convolution corresponds to:
    A) Differentiation
    B) Integration
    C) Multiplication
    D) Time reversal
    Answer: C

    MCQ 26

    What does ROC (Region of Convergence) determine in Laplace Transform?
    A) Type of filter
    B) Frequency domain response
    C) Stability and causality
    D) Periodicity
    Answer: C

    MCQ 27

    Which is the Fourier Transform of a rectangular pulse in time domain?
    A) Delta function
    B) Sinc function
    C) Step function
    D) Ramp function
    Answer: B

    MCQ 28

    Z-transform of δ[n]\delta[n] is:
    A) 1
    B) 0
    C) z
    D) 11−z−1\frac{1}{1 - z^{-1}}
    Answer: A

    MCQ 29

    A signal is said to be deterministic if:
    A) It is random in nature
    B) Its behavior cannot be predicted
    C) It is periodic
    D) It can be described by an explicit function
    Answer: D

    MCQ 30

    Which of the following is a causal signal?
    A) x(t)=u(t)x(t) = u(t)
    B) x(t)=u(−t)x(t) = u(-t)
    C) x(t)=δ(t+2)x(t) = \delta(t + 2)
    D) x(t)=cos⁡(t)x(t) = \cos(t)
    Answer: A

    ✅ Signals & Systems Quiz Summary (So Far)

    • Total Questions: 30

    • Focus Areas: Causality, Linearity, Fourier & Laplace Transform, Convolution, Z-transform, Signal Classification

    • Ideal for: GATE ECE, PSUs, B.Tech & M.Tech EC Exams

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    Perfect! Here's the next continuation of the Signals & Systems MCQs for ECE (Questions 31 to 40), designed to support GATE, IES, and university-level exam prep. This set keeps the SEO-rich formatting and technical relevance for PDF or online publishing.

    🔍 Signals & Systems MCQs – Continued (Set 4)

    MCQ 31

    What is the Z-transform of anu[n]a^n u[n], where ∣a∣<1|a| < 1?
    A) 11−az−1\frac{1}{1 - az^{-1}}
    B) 11+az−1\frac{1}{1 + az^{-1}}
    C) zz
    D) δ[n]\delta[n]
    Answer: A

    MCQ 32

    If a system's impulse response h(t)h(t) is absolutely integrable, the system is:
    A) Time-invariant
    B) Linear
    C) Stable
    D) Periodic
    Answer: C

    MCQ 33

    The Fourier transform of a time-reversed signal x(−t)x(-t) is:
    A) X(jω)X(j\omega)
    B) −X(jω)-X(j\omega)
    C) X(−jω)X(-j\omega)
    D) −X(−jω)-X(-j\omega)
    Answer: C

    MCQ 34

    Which of these signals is both even and periodic?
    A) x(t)=e−tx(t) = e^{-t}
    B) x(t)=cos⁡(t)x(t) = \cos(t)
    C) x(t)=t⋅u(t)x(t) = t \cdot u(t)
    D) x(t)=sin⁡(t)x(t) = \sin(t)
    Answer: B

    MCQ 35

    Which of the following systems is time-varying?
    A) y(t)=2x(t)y(t) = 2x(t)
    B) y(t)=x(t−1)y(t) = x(t-1)
    C) y(t)=t⋅x(t)y(t) = t \cdot x(t)
    D) y(t)=x(t)+x(t+2)y(t) = x(t) + x(t+2)
    Answer: C

    MCQ 36

    In a discrete-time system, the output is given by y[n]=x[n]+x[n−1]y[n] = x[n] + x[n-1]. This system is:
    A) Memoryless
    B) Linear and time-invariant
    C) Non-causal
    D) Time-varying
    Answer: B

    MCQ 37

    The inverse Laplace Transform of 1s+a\frac{1}{s+a} is:
    A) e−atu(t)e^{-at}u(t)
    B) δ(t−a)\delta(t-a)
    C) u(t−a)u(t-a)
    D) tat^a
    Answer: A

    MCQ 38

    Which transform is defined only for discrete-time signals?
    A) Laplace Transform
    B) Fourier Transform
    C) Z-Transform
    D) Fourier Series
    Answer: C

    MCQ 39

    A causal system cannot produce an output:
    A) That depends on the current input
    B) Before the input is applied
    C) That is time-shifted
    D) If input is zero
    Answer: B

    MCQ 40

    The convolution of any signal with a delta function yields:
    A) A zero signal
    B) An inverted signal
    C) The original signal
    D) A delayed signal
    Answer: C

    📘 Quiz Progress

    • ✅ Total Questions So Far: 40

    • ✅ Covers Key Concepts: Time & Frequency Domains, Causality, Stability, Transform Pairs, System Properties

    📥 Download EC Quiz PDF (40 MCQs)

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    Excellent! Here's the next continuation (Set 5: Questions 41 to 50) of the Signals & Systems MCQs for Electronics & Communication Engineering. These questions maintain clarity, technical accuracy, and SEO-rich formatting to support both PDF creation and online publishing.

    🔍 Signals & Systems MCQs – Continued (Set 5)

    MCQ 41

    If the Fourier Transform of x(t)x(t) is X(jω)X(j\omega), then the Fourier Transform of x(t−t0)x(t - t_0) is:
    A) X(jω−t0)X(j\omega - t_0)
    B) X(jω)e−jωt0X(j\omega)e^{-j\omega t_0}
    C) X(jω)t0X(j\omega)t_0
    D) ejωt0e^{j\omega t_0}
    Answer: B

    MCQ 42

    Which condition must be satisfied for a system to be linear?
    A) Additivity only
    B) Homogeneity only
    C) Additivity and homogeneity
    D) Time-invariance
    Answer: C

    MCQ 43

    If a continuous-time signal is sampled at a rate less than the Nyquist rate, it causes:
    A) Bandwidth increase
    B) Aliasing
    C) Quantization
    D) Convolution error
    Answer: B

    MCQ 44

    A signal with infinite duration and zero average power is a:
    A) Power signal
    B) Energy signal
    C) Random signal
    D) Periodic signal
    Answer: A

    MCQ 45

    The Dirac delta function δ(t)\delta(t) has:
    A) Zero value at t=0t = 0
    B) Finite area and infinite height
    C) Infinite area
    D) Finite height
    Answer: B

    MCQ 46

    The ROC of a causal system in Z-transform is:
    A) Inside the unit circle
    B) On the unit circle
    C) Outside the outermost pole
    D) Inside the innermost pole
    Answer: C

    MCQ 47

    If x(t)x(t) is real and even, then its Fourier Transform is:
    A) Real and odd
    B) Real and even
    C) Imaginary and odd
    D) Complex
    Answer: B

    MCQ 48

    What is the effect of time-scaling x(at)x(at) in the frequency domain?
    A) Shift
    B) Time delay
    C) Amplitude scaling
    D) Frequency scaling
    Answer: D

    MCQ 49

    The Laplace Transform of a derivative dx(t)dt\frac{dx(t)}{dt} is:
    A) sX(s)+x(0)sX(s) + x(0)
    B) sX(s)−x(0)sX(s) - x(0)
    C) sX(s)sX(s)
    D) X(s)/sX(s)/s
    Answer: B

    MCQ 50

    Which type of system response is governed only by the system's natural behavior?
    A) Forced response
    B) Convolution response
    C) Impulse response
    D) Natural response
    Answer: D

    ✅ MCQ Summary (Sets 1–5 Complete)

    • ✅ Total MCQs: 50

    • ✅ Ideal for: GATE ECE, IES, UG/PG EC Students, Online EC Quiz Practice

    • ✅ Covered: Fourier & Laplace Transforms, Z-Transform, LTI Systems, Stability, Signal Types, Convolution

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    Fantastic! Let's move on with the next set of 10 questions (MCQs 51–60) to take your Signals & Systems – EC Engineering Quiz PDF to the next level. These MCQs continue to follow the standard syllabus for GATE, ESE, and university exams, and are suitable for both online SEO-optimized posts and downloadable PDFs.

    🔍 Signals & Systems MCQs – Continued (Set 6)

    MCQ 51

    Which property is violated if y(t)=x2(t)y(t) = x^2(t)?
    A) Time invariance
    B) Causality
    C) Memorylessness
    D) Linearity
    Answer: D
    (Explanation: Squaring is a nonlinear operation.)

    MCQ 52

    A signal is periodic if:
    A) It has a defined average value
    B) x(t)=x(t+T)x(t) = x(t + T) for all t
    C) It is absolutely integrable
    D) It has exponential decay
    Answer: B

    MCQ 53

    The ROC for the Z-transform of a stable and causal system is:
    A) Inside the unit circle
    B) On the unit circle
    C) Entire z-plane
    D) Outside the outermost pole including the unit circle
    Answer: D

    MCQ 54

    Which of the following is not an LTI system?
    A) y(t)=∫0tx(τ)dτy(t) = \int_{0}^{t} x(\tau) d\tau
    B) y(t)=3x(t)y(t) = 3x(t)
    C) y(t)=x2(t)y(t) = x^2(t)
    D) y(t)=x(t−2)y(t) = x(t - 2)
    Answer: C

    MCQ 55

    Which function in the frequency domain represents an ideal low-pass filter?
    A) Rectangular function
    B) Delta function
    C) Exponential function
    D) Ramp function
    Answer: A

    MCQ 56

    The Nyquist sampling rate for a 10 kHz signal is:
    A) 5 kHz
    B) 10 kHz
    C) 15 kHz
    D) 20 kHz
    Answer: D

    MCQ 57

    What is the system response to a unit impulse input?
    A) Step response
    B) Natural response
    C) Impulse response
    D) Zero-input response
    Answer: C

    MCQ 58

    For a signal x(t)=Acos⁡(ωt+ϕ)x(t) = A \cos(\omega t + \phi), the average power is:
    A) A2A^2
    B) A2/2A^2/2
    C) A/2A/2
    D) 00
    Answer: B

    MCQ 59

    Which system characteristic ensures that future inputs do not affect the output?
    A) Stability
    B) Linearity
    C) Memorylessness
    D) Causality
    Answer: D

    MCQ 60

    The Laplace transform of e−atu(t)e^{-at}u(t) is:
    A) 1s+a\frac{1}{s + a}
    B) 1s−a\frac{1}{s - a}
    C) s+as + a
    D) ae−stae^{-st}
    Answer: A

    📘 Updated Summary

    • 🔢 Total MCQs Now: 60

    • 📚 Topics Covered: Periodicity, Linearity, Impulse Response, Filters, Sampling, Laplace & Z-Transform, LTI Properties

    • 🎯 Target Exams: GATE ECE, UGC NET, PSU Exams (ISRO, DRDO), B.Tech EC

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    Great! Let’s continue with Set 7: MCQs 61–70 of your “Signals & Systems – Electronics & Communication MCQs” collection. These are crafted to support GATE, ESE, and academic exam prep, while keeping SEO-friendly formatting for PDF and blog usage.

    🔍 Signals & Systems MCQs – Continued (Set 7)

    MCQ 61

    Which condition is necessary for a signal to be strictly power-limited?
    A) It must be periodic
    B) It must have infinite energy
    C) Its power must be finite and non-zero
    D) It must be zero for t<0t < 0
    Answer: C

    MCQ 62

    The Laplace transform of tnu(t)t^n u(t) is:
    A) 1sn+1\frac{1}{s^{n+1}}
    B) sns^{n}
    C) n!sn+1\frac{n!}{s^{n+1}}
    D) ns\frac{n}{s}
    Answer: C

    MCQ 63

    In convolution, if one signal is δ(t)\delta(t), the output is:
    A) Always zero
    B) The same as the other signal
    C) A delayed version of the signal
    D) A constant
    Answer: B

    MCQ 64

    Which operation in the time domain corresponds to multiplication in frequency domain?
    A) Convolution
    B) Integration
    C) Addition
    D) Sampling
    Answer: A

    MCQ 65

    The autocorrelation function of an energy signal is:
    A) Constant
    B) Symmetric
    C) Periodic
    D) Zero
    Answer: B

    MCQ 66

    Which of these signals is odd?
    A) x(t)=cos⁡(t)x(t) = \cos(t)
    B) x(t)=tx(t) = t
    C) x(t)=e−tx(t) = e^{-t}
    D) x(t)=t2x(t) = t^2
    Answer: B

    MCQ 67

    Which transform is best suited for analyzing discrete-time LTI systems?
    A) Laplace Transform
    B) Z-Transform
    C) Fourier Series
    D) Continuous Fourier Transform
    Answer: B

    MCQ 68

    The Fourier Series exists for:
    A) Only energy signals
    B) Only power signals
    C) Only periodic signals
    D) Aperiodic signals
    Answer: C

    MCQ 69

    If a system has no memory, its output depends on:
    A) Past input
    B) Present and past inputs
    C) Present input only
    D) Derivatives of input
    Answer: C

    MCQ 70

    The response of a system to a unit step input is called:
    A) Impulse response
    B) Step response
    C) Natural response
    D) Forced response
    Answer: B

    ✅ Updated Progress Overview

    • 📊 Total MCQs Now: 70

    • 🧠 Coverage: Laplace, Power/Energy Signals, Odd/Even Properties, Autocorrelation, Memoryless Systems, Convolution

    • 🎯 Purpose: Designed for GATE ECE, ESE, PSUs, B.Tech/M.Tech EC Programs

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    Awesome! Let's keep going with Set 8: MCQs 71–80 from your "Signals & Systems – Electronics & Communication MCQs" series. This set continues to reinforce essential concepts for GATE, ESE, PSU, and University exams, and is optimized for inclusion in PDFs, eBooks, and blog formats.

    🔍 Signals & Systems MCQs – Continued (Set 8)

    MCQ 71

    The output of an LTI system is zero for every input. The system is:
    A) Stable
    B) Memoryless
    C) Null system
    D) Causal
    Answer: C

    MCQ 72

    If a signal satisfies x(t)=−x(−t)x(t) = -x(-t), it is classified as:
    A) Even
    B) Periodic
    C) Odd
    D) Energy signal
    Answer: C

    MCQ 73

    Which of the following signals has infinite energy but finite power?
    A) Unit impulse
    B) Exponential signal
    C) Sine wave
    D) Rectangular pulse
    Answer: C

    MCQ 74

    Which of these represents the condition for causality in Laplace Transform?
    A) ROC includes Re(s)>0\text{Re}(s) > 0
    B) ROC includes imaginary axis
    C) ROC is to the left of the leftmost pole
    D) ROC is to the right of the rightmost pole
    Answer: D

    MCQ 75

    The total area under the unit step function u(t)u(t) from 0 to ∞\infty is:
    A) 0
    B) 1
    C) Infinity
    D) Undefined
    Answer: C

    MCQ 76

    The Fourier Transform of a sinc function is:
    A) A constant
    B) A delta function
    C) A rectangular function
    D) An exponential
    Answer: C

    MCQ 77

    The Laplace Transform exists only if the function is:
    A) Periodic
    B) Continuous
    C) Differentiable
    D) Piecewise continuous and of exponential order
    Answer: D

    MCQ 78

    Which property of an LTI system helps determine system behavior using impulse response?
    A) Causality
    B) Stability
    C) Time-invariance
    D) Convolution
    Answer: D

    MCQ 79

    Which of the following is an example of a non-linear system?
    A) y(t)=3x(t)y(t) = 3x(t)
    B) y(t)=x(t)+2y(t) = x(t) + 2
    C) y(t)=x3(t)y(t) = x^3(t)
    D) y(t)=x(t−1)y(t) = x(t - 1)
    Answer: C

    MCQ 80

    The inverse Z-transform of 11−az−1\frac{1}{1 - az^{-1}}, for ∣z∣>∣a∣|z| > |a|, is:
    A) ana^n
    B) a−na^{-n}
    C) anu[n]a^n u[n]
    D) anu[−n]a^n u[-n]
    Answer: C

    ✅ Updated MCQ Progress

    • 📊 Total Questions So Far: 80

    • 🔍 Core Topics Covered:

      • Odd/Even Signals

      • Energy & Power

      • Laplace & Fourier Properties

      • Causality Conditions

      • Convolution

      • Impulse/System Behavior

    📥 Download the Full EC Quiz PDF (80 MCQs)

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    📄 Includes all MCQs from Sets 1–8 with answer key. Ready for print or digital study.

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    Great consistency! Let’s continue with Set 9: MCQs 81–90 of your "Signals & Systems – Electronics & Communication MCQs" series. You're almost at 100 MCQs — a solid benchmark for any serious engineering quiz book or competitive exam guide!

    🔍 Signals & Systems MCQs – Continued (Set 9)

    MCQ 81

    The Fourier Transform of a constant function is:
    A) Delta function
    B) Sinc function
    C) Exponential function
    D) Ramp function
    Answer: A

    MCQ 82

    Which system output depends only on the input at that exact instant?
    A) Memoryless system
    B) Time-invariant system
    C) Stable system
    D) Causal system
    Answer: A

    MCQ 83

    The system described by y(t)=∫−∞tx(τ)dτy(t) = \int_{-\infty}^{t} x(\tau) d\tau is:
    A) Memoryless
    B) Time-invariant and linear
    C) Causal and stable
    D) Unstable and nonlinear
    Answer: B

    MCQ 84

    The Fourier Transform exists for a signal only if it is:
    A) Continuous
    B) Periodic
    C) Absolutely integrable
    D) Band-limited
    Answer: C

    MCQ 85

    Which signal is best described by a delta function in the time domain?
    A) A spike with zero duration and finite area
    B) A constant
    C) A unit step
    D) A sinusoid
    Answer: A

    MCQ 86

    Which of these is not a property of convolution?
    A) Commutativity
    B) Associativity
    C) Linearity
    D) Time-reversal
    Answer: D

    MCQ 87

    A signal x(t)=cos⁡(200πt)x(t) = \cos(200\pi t) is sampled at 150 Hz. What phenomenon occurs?
    A) Oversampling
    B) Aliasing
    C) Quantization
    D) Time-shifting
    Answer: B
    (Nyquist rate = 2 × 100 Hz = 200 Hz → Sampling below this causes aliasing)

    MCQ 88

    Which transform is used in analyzing discrete-time periodic signals?
    A) Laplace Transform
    B) Z-Transform
    C) Discrete-Time Fourier Series (DTFS)
    D) Continuous Fourier Transform
    Answer: C

    MCQ 89

    The magnitude spectrum of an even signal is:
    A) Odd
    B) Even
    C) Complex
    D) Negative
    Answer: B

    MCQ 90

    Which property of the delta function makes it useful in system analysis?
    A) Periodicity
    B) Time-shifting
    C) Sifting property
    D) Linearity
    Answer: C
    (Sifting property: ∫x(t)δ(t−t0)dt=x(t0)\int x(t)\delta(t - t_0)dt = x(t_0))

    ✅ Updated Quiz Progress

    • 🧮 Total MCQs Now: 90

    • 📚 Topics Added: Sampling Theory, DTFS, Magnitude Spectrum, Convolution Properties, Sifting, and Memory

    • 💡 Format Ready For: Blog posts, competitive coaching content, eBooks, and printable revision guides

    📥 PDF Download – Signals & Systems (90 MCQs)

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    🗂️ Fully structured MCQs + answer key – great for GATE, ESE, DRDO, ISRO, and university EC exams

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    Shall I continue with the last batch (MCQs 91–100) to complete the full 100-question set?

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    You said:
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    ChatGPT said:

    You got it! Here’s the final set — MCQs 91 to 100 — to complete your Signals & Systems MCQs for Electronics & Communication Engineering. This wraps up the full 100-question quiz, perfect for competitive exam prep and quick revision.

    🔍 Signals & Systems MCQs – Final Set (91–100)

    MCQ 91

    The output of an LTI system when the input is an impulse is called:
    A) Step response
    B) Impulse response
    C) Frequency response
    D) Transient response
    Answer: B

    MCQ 92

    If the Laplace transform X(s)X(s) of x(t)x(t) exists for Re(s)>a\text{Re}(s) > a, then the region Re(s)>a\text{Re}(s) > a is called:
    A) Pole
    B) Zero
    C) ROC (Region of Convergence)
    D) Nyquist region
    Answer: C

    MCQ 93

    The Fourier Transform of δ(t−t0)\delta(t - t_0) is:
    A) e−jωt0e^{-j\omega t_0}
    B) δ(ω−t0)\delta(\omega - t_0)
    C) 11
    D) sin⁡(ωt0)\sin(\omega t_0)
    Answer: A

    MCQ 94

    Which of the following signals is not absolutely integrable?
    A) e−tu(t)e^{-t}u(t)
    B) cos⁡(t)\cos(t)
    C) e−t2e^{-t^2}
    D) δ(t)\delta(t)
    Answer: B

    MCQ 95

    The Nyquist frequency for a signal with maximum frequency fmaxf_{max} is:
    A) fmaxf_{max}
    B) 2fmax2f_{max}
    C) fmax/2f_{max}/2
    D) 4fmax4f_{max}
    Answer: B

    MCQ 96

    The output of a causal LTI system depends on:
    A) Past and present inputs
    B) Future inputs
    C) Present input only
    D) Past inputs only
    Answer: A

    MCQ 97

    If the impulse response h(t)h(t) of an LTI system is absolutely integrable, then the system is:
    A) Stable
    B) Causal
    C) Memoryless
    D) Nonlinear
    Answer: A

    MCQ 98

    In the Z-transform, the poles determine:
    A) Signal duration
    B) Stability and causality of the system
    C) Energy of the signal
    D) Sampling frequency
    Answer: B

    MCQ 99

    Which of the following is an even function?
    A) sin⁡(t)\sin(t)
    B) cos⁡(t)\cos(t)
    C) tt
    D) ejte^{jt}
    Answer: B

    MCQ 100

    The convolution of two signals in time domain corresponds to which operation in frequency domain?
    A) Multiplication
    B) Addition
    C) Differentiation
    D) Integration
    Answer: A

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