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Shopping Zone Tv Interview Questions and Answers

Updated 5 Feb 2024

Q1. Are all heterocyclic compounds aromatic?

Ans.

No, not all heterocyclic compounds are aromatic.

  • Aromaticity depends on the presence of a conjugated ring of atoms with a certain number of pi electrons.

  • Heterocyclic compounds may or may not have this conjugated ring structure.

  • Examples of non-aromatic heterocyclic compounds include pyridine N-oxide and pyrrole.

  • Examples of aromatic heterocyclic compounds include pyridine and furan.

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Q2. What is fft and explain its significance?

Ans.

FFT stands for Fast Fourier Transform. It is a mathematical algorithm used to transform time-domain signals into frequency-domain signals.

  • FFT is used in signal processing to analyze and filter signals.

  • It is used in audio and image compression.

  • It is also used in solving differential equations and in cryptography.

  • FFT is significant because it allows for efficient analysis of signals in the frequency domain.

  • It is faster than the traditional Fourier transform algorithm.

  • FFT is wid...read more

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Q3. Define convolution & xplain its importance

Ans.

Convolution is a mathematical operation that combines two functions to produce a third function.

  • It is used in signal processing to extract features from signals.

  • It is used in image processing for tasks such as edge detection and blurring.

  • It is used in machine learning for tasks such as image recognition and natural language processing.

  • It is important in physics for solving differential equations.

  • It is used in audio processing for tasks such as reverb and echo effects.

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Q4. Is fft a transform by it self?

Ans.

Yes, FFT is a transform by itself.

  • FFT stands for Fast Fourier Transform

  • It is a mathematical algorithm used to transform a signal from time domain to frequency domain

  • FFT is a standalone transform and can be used for various applications such as signal processing, image processing, and data compression

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Q5. bjt regions & its operation as a switch

Ans.

BJT has three regions: emitter, base, and collector. It operates as a switch by controlling the base current.

  • BJT has two modes of operation: active mode and cutoff mode

  • In active mode, the base-emitter junction is forward-biased and the collector-emitter junction is reverse-biased

  • In cutoff mode, both junctions are reverse-biased

  • To use BJT as a switch, it is operated in either active or cutoff mode

  • By controlling the base current, the BJT can be switched between the two modes

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Q6. OFDMA and its applications

Ans.

OFDMA is a multiple access technique used in wireless communication systems.

  • OFDMA stands for Orthogonal Frequency Division Multiple Access.

  • It allows multiple users to transmit data simultaneously over the same frequency band.

  • OFDMA is used in 4G and 5G cellular networks, WiMAX, and other wireless communication systems.

  • It improves spectral efficiency and reduces interference.

  • OFDMA divides a channel into multiple subcarriers and assigns them to different users.

  • Each subcarrier ca...read more

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