Signals & Systems
JKSSB Sub-Inspector (Telecommunication) · Engineering Mathematics & Signal Fundamentals · 14 practice questions with answers and explanations: 3 Easy, 6 Medium, 5 Hard.
Sample questions
Sample Easy question 1
What is a 'periodic signal'?
- A signal that repeats itself at regular intervals of time
- A signal that never repeats
- A signal with zero amplitude
- A signal that only exists once
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Answer: A. A periodic signal repeats its pattern at fixed, regular time intervals.
Sample Medium question 2
What is 'convolution' used for in signal processing (conceptually)?
- Combining two signals to determine how one modifies the shape of the other, often used in filtering
- Only adding two numbers
- Removing a signal entirely
- Measuring signal color
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Answer: A. Convolution mathematically describes how a system's response combines with an input signal, central to filtering.
Sample Hard question 3
What is the 'impulse response' of a system?
- The output of a system when the input is an impulse (a very short, ideal pulse)
- The output when there is no input
- The average output over all time
- The system's physical size
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Answer: A. Impulse response fully characterizes an LTI system's behavior when driven by an ideal impulse input.