JBS Enterprises Junior Engineer Interview Questions and Answers

Focused on electronics, about signals and waves

Q1. Technical focussed on electronics
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Q2. What is a rectifier?
Ans. 
A rectifier is an electrical device that converts alternating current (AC) to direct current (DC).
• Rectifiers are commonly used in power supplies to convert AC to DC for electronic devices.

• They can be half-wave, full-wave, or bridge rectifiers.

• Examples of rectifiers include diode rectifiers and silicon-controlled rectifiers (SCRs).
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Q3. What is modulation?
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Modulation is the process of varying one or more properties of a high-frequency periodic waveform, called the carrier signal, with a modulating signal.
• Modulation is used to encode information on a carrier signal for transmission.

• There are different types of modulation techniques such as Amplitude Modulation (AM), Frequency Modulation (FM), and Phase Modulation (PM).

• Example: In AM, the amplitude of the carrier signal is...read more
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Q4. What is sampling?
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Sampling is the process of selecting a subset of individuals from a larger population to represent the whole.
• Sampling helps in making inferences about the population based on the characteristics of the sample.

• Common sampling methods include random sampling, stratified sampling, and cluster sampling.

• For example, a survey conducted by selecting a random sample of households to represent the entire city's population.
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Q5. What is an oscillator?
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An oscillator is an electronic circuit that produces a repetitive electronic signal, typically a sine wave or square wave.
• An oscillator generates a periodic waveform without any external input signal.

• It uses positive feedback to sustain oscillations.

• Common types of oscillators include LC oscillators, crystal oscillators, and relaxation oscillators.

• Oscillators are used in various applications such as signal generation,
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Introduction
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Introduction by self

Q1. What is pcb explain
Ans. 
PCB stands for Printed Circuit Board, which is a board made of non-conductive material with conductive tracks for electronic components.
• PCB is used to mechanically support and electrically connect electronic components using conductive pathways.

• It is commonly made of fiberglass, composite epoxy, or other non-conductive materials.

• Components like resistors, capacitors, and integrated circuits are soldered onto the PCB to...read more
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Q2. Work of the capicitor
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Capacitors store and release electrical energy in a circuit.
• Capacitors store energy in an electric field

• They can release the stored energy quickly when needed

• Capacitors are commonly used in electronic circuits to filter signals or store energy

• Examples: smoothing out voltage fluctuations in power supplies, timing circuits in oscillators
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