Electrical and Electronics Engineering Interview Questions and Answers
Question - 31 : - What Is Am?
Answer - 31 : -
Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. In amplitude modulation, the amplitude (signal strength) of the carrier wave is varied in proportion to the waveform being transmitted. That waveform may, for instance, correspond to the sounds to be reproduced by a loudspeaker, or the light intensity of television pixels.This technique contrasts with frequency modulation, in which the frequency of the carrier signal is varied, and phase modulation, in which its phase is varied.
Question - 32 : - What Is Fm?
Answer - 32 : -
In telecommunications and signal processing, frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. (Compare with amplitude modulation, in which the amplitude of the carrier wave varies, while the frequency remains constant.)
Question - 33 : - What Is The Purpose Of Using Data Modem?
Answer - 33 : -
Short for modulatordemodulator. A modem is a device or program that enables a computer to transmit data over, for example, telephone or cable lines. Computer information is stored digitally, whereas information transmitted over telephone lines is transmitted in the form of analog waves.
Question - 34 : - What Is Zigbee?
Answer - 34 : -
ZigBee is a IEEE 802.15.4based specification for a suite of highlevel communication protocols used to create personal area networks with small, lowpower digital radios.
Question - 35 : - What Is Pcb?
Answer - 35 : -
A printed circuit board (PCB) mechanically supports and electrically connects electronic components using conductive tracks, pads and other features etched from copper sheets laminated onto a nonconductive substrate.
Question - 36 : - Define Voltage Regulator?
Answer - 36 : -
A voltage regulator is designed to automatically maintain a constant voltage level. A voltage regulator may be a simple “feedforward” design or may include negative feedback control loops. It may use an electromechanical mechanism, or electronic components.
Question - 37 : - What Is Scr?
Answer - 37 : -
Thyristors or silicon controlled rectifiers, SCR are find many uses in electronics, and in particular for power control. These devices have even been called the workhorse of high power electronics.Thyristors are able to switch large levels of power are accordingly they used in a wide variety of different applications. Thyristors even finds uses in low power electronics where they are used in many circuits from light dimmers to power supply over voltage protection.
Question - 38 : - Define Microprocessor?
Answer - 38 : -
A siliconchip that contains a CPU. In the world of personal computers, the terms microprocessor and CPU are used interchangeably. At the heart of all personal computers and most workstations sits a microprocessor. Microprocessors also control the logic of almost all digitaldevices, from clock radios to fuelinjection systems for automobiles.
Question - 39 : - Define Microcontroller?
Answer - 39 : -
A microcontroller (sometimes abbreviated µC, uC or MCU) is a small computer on a single integrated circuit containing a processor core, memory, and programmable input/output peripherals.
Question - 40 : - Define Timer?
Answer - 40 : -
The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation, and oscillator applications. The 555 can be used to provide time delays, as an oscillator, and as a flipflop element. Derivatives provide up to four timing circuits in one package.