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Explore topic-wise InterviewSolutions in Electronics.

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.

1.	What is the full form of PCM ?
Answer» Pcm Definition: PCM Full Form: Pulse Code Modulation Pcm Description: Here we are sharing two full forms of PCM – PCM full form in signal transmission The full form of PCM is Pulse Code Modulation which is like a technique that converts analogue signals into digital communication. Pulse code modulation is one of the most used noise resistant transmission method. Pulse code modulation needs high transmitter bandwidth for transmission of analogue signal to digital signal. The pulse code modulation provides an important benefit that is the message in the pulse code modulation is a train of pulses of equal height. This means these pulses can be regenerated almost perfectly any given number of times analogue the propagation path. This is because the information or data is not dependent on the accurate height and shape of these pulses. This type of modulation like PCM normally used in both the telephone network and pubic as well as private. There are two basic properties of a pulse code modulation which determines the stream fidelity to the original analogue signal and these two properties are – Sampling rate that is the number of times per second that samples are taken The bit depth that decides the possible digital values that can be used to describe every sample. LPCM LPCM is a specific type of pulse code modulation which means linear pulse code modulation. In linear pulse code modulation the quantization levels are linearly uniform. This is different than the pulse code modulation encodings where quantization levels depends as the function of amplitude which can be as the A-law algorithm or the U-law algorithm. Pulse code modulation is more common term used instead of LPCM and it is generally used to present data encoded as Linear pulse code modulation. PCM history In 1937 the British engineer name Alec Reeves conceived the use of pulse code modulation or PCM for voice communication while he was unaware of his previous work. Working for the international telephone and telegraph in France it was discovered by Alec reeves. Alec described the theory and PCM advantages however there was no practical application. In 1938 Reeves filed for a French patent however his United States’ patent was granted in 1943. Until his US patent Alec started working at the

2.	What is the full form of LED ?
Answer» Led Definition: LED Full Form: Light Emitting Diode<p>Led Description: LED meaning or Full form is Light Emitting Diode. LED means light-emitting diode is a semiconductor light source that Emits lights when applying a predefined voltage. Basically, this is a PN-Junction Diode, which emits light when a voltage above the threshold voltage is applied. LED is used in much electronic equipment today due to its very good quality. LED is the latest invention, used by most people today. This is the reason why the popularity and use of LEDs are increasing day by day. The LED is made by merging P and N-type semiconductor materials. As we know, silicon and germanium are used in a normal semiconductor diode, but this semiconductor material is not used in light-emitting diodes. Gallium arsenide (GaAs) or gallium arsenide phosphate(GaAsP) is used in its place. This material is used in LED due to its special characteristics. This material has this property, it emits light, not heat when applying voltage. LED is manufactured as a forward bias device. LED works on the principle of Electroluminescence. The Property of semiconductor material by which it converts electrical energy into Light Energy is called Electroluminescence. as said earlier LED is a Forward Bias semiconductor device, which means it will start working when the p terminal of the diode will be connected to the positive potential of a battery, and the N terminal of the device to the negative terminal of the battery. so the holes in the P side experience repulsion because of the positive voltage applied by the battery and the electrons in the N side experiences repulsion due to negative supply by the Battery. due to this repulsion, the electrons start moving from the conduction band to the Valance band. During their movement Electrons releases some energy, but in the case of a LED, it emits Light energy, because of the characteristic of the material of LED. Today LED is available in all colours, and we can choose

3.	What is the full form of LCD ?
Answer» Lcd Definition: LCD Full Form: Liquid Crystal display Lcd Description: LCD meaning or full form is Liquid Crystal Display.

4.	What is the full form of NVR ?
Answer» Dvr Definition: NVR Full Form: Network Video Recorder Dvr Description: NVR full form or meaning is Network Video Recorder