## 1. Fourier Transform is used in signal processing to:

### Answer:

### Explanation:

Fourier Transform is a mathematical technique used to transform a signal from the time domain to the frequency domain, analyzing the frequency content.

## 2. In digital signal processing, 'sampling' refers to:

### Answer:

### Explanation:

Sampling is the process of converting an analog signal into a digital signal by measuring its amplitude at regular intervals.

## 3. The Nyquist rate is:

### Answer:

### Explanation:

The Nyquist rate is the minimum sampling rate required to avoid aliasing, which is twice the highest frequency present in the signal.

## 4. A low-pass filter allows:

### Answer:

### Explanation:

A low-pass filter is designed to allow signals with a frequency lower than a certain cutoff frequency to pass through while attenuating higher frequencies.

## 5. Aliasing occurs when:

### Answer:

### Explanation:

Aliasing is a phenomenon that occurs when a signal is sampled at a rate below the Nyquist rate, causing different signals to become indistinguishable.

## 6. The Z-transform in signal processing is used for:

### Answer:

### Explanation:

The Z-transform is a mathematical tool used in signal processing to analyze and design systems for discrete-time signals.

## 7. In the context of signal processing, 'convolution' refers to:

### Answer:

### Explanation:

Convolution is a mathematical operation on two functions (signals) that produces a third function expressing how the shape of one is modified by the other.

## 8. A band-pass filter is used to:

### Answer:

### Explanation:

A band-pass filter is designed to allow frequencies within a certain range to pass through while attenuating frequencies outside that range.

## 9. The main purpose of modulation in signal processing is to:

### Answer:

### Explanation:

Modulation is the process of varying a carrier signal in order to use that signal to convey information, facilitating its transmission over a medium.

## 10. Quantization noise in digital signal processing is due to:

### Answer:

### Explanation:

Quantization noise is the error introduced by the quantization process in digital signal processing, due to the finite resolution of the digital representation.

## 11. In signal processing, 'phase shift' refers to:

### Answer:

### Explanation:

Phase shift in signal processing refers to the shifting of the phase of a signal's waveforms, causing a time delay or advance.

## 12. The process of extracting a low-frequency signal from a high-frequency carrier wave is called:

### Answer:

### Explanation:

Demodulation is the process of extracting the original information-bearing signal from a modulated carrier wave.

## 13. A signal's frequency spectrum can be obtained using:

### Answer:

### Explanation:

The Fourier Transform is used to analyze the frequency content of signals, converting them from the time domain to the frequency domain.

## 14. In a communication system, the role of an equalizer is to:

### Answer:

### Explanation:

An equalizer in a communication system is used to compensate for signal distortion due to channel imperfections.

## 15. Pulse Code Modulation (PCM) is a method of:

### Answer:

### Explanation:

Pulse Code Modulation is a method used to digitally represent sampled analog signals.

## 16. The main advantage of digital signal processing over analog signal processing is:

### Answer:

### Explanation:

Digital signal processing offers greater precision and flexibility compared to analog processing, particularly in terms of programmability and the ability to apply complex algorithms.

## 17. In signal processing, a 'filter' is used to:

### Answer:

### Explanation:

A filter in signal processing is used to remove or reduce unwanted components or features from a signal.

## 18. The primary purpose of Automatic Gain Control (AGC) is to:

### Answer:

### Explanation:

Automatic Gain Control is used to automatically adjust the gain of a signal to maintain a constant level of signal strength.

## 19. The process of increasing the sampling rate of a signal is known as:

### Answer:

### Explanation:

Upsampling is the process of increasing the sampling rate of a signal, often used in digital signal processing.

## 20. A 'bit rate' in digital communication is the:

### Answer:

### Explanation:

Bit rate is the number of bits that are conveyed or processed per unit of time in a digital communication system.

## 21. The main advantage of an FIR filter over an IIR filter is:

### Answer:

### Explanation:

FIR (Finite Impulse Response) filters are inherently stable as they do not have feedback, unlike IIR (Infinite Impulse Response) filters.

## 22. The primary use of window functions in signal processing is to:

### Answer:

### Explanation:

Window functions are used to reduce spectral leakage when performing a Fourier Transform on signals.

## 23. The Shannon-Hartley theorem is a fundamental limit related to:

### Answer:

### Explanation:

The Shannon-Hartley theorem provides the maximum rate at which information can be transmitted over a communication channel of a specified bandwidth in the presence of noise.

## 24. In Adaptive Signal Processing, the term 'adaptive' refers to:

### Answer:

### Explanation:

Adaptive signal processing involves systems that can adjust their filtering parameters dynamically and in real-time to adapt to changing signal conditions.

## 25. The Discrete Fourier Transform (DFT) is used in signal processing to:

### Answer:

### Explanation:

The Discrete Fourier Transform is used to convert signals from the time domain to the frequency domain, specifically for discrete signals.