List of top Electronics Technology Questions on Electronics asked in CBSE CLASS XII

What are the possible problems that can occur at different subsections of cable TV?
Explain working, merits, demerits and application of moving coil microphone.
Explain the working principle of microwave oven.
With the help of a block diagram, explain the working principle of disc recording system.
Write some general causes of failure of recorder/player.
Explain the working and features of remote control of TV receiver.
What is a loudspeaker? Write names of different types of loudspeakers.
What is the function of DC Biasing?
Write a short note on Tweeter.
Explain the process of scrambling.
______________________________ is referred to as ‘heart’ of the image formation system in a printer.
In a FAX machine if the printed image is dirty, then:
The device used in microwave oven to match power between source and load is called circulator. (True/False)
A magnetron is used in_____________________.
In TV transmission, aspect ratio is the ratio between:
The process by which the information is modified with the help of locally generated carriers is called ___________.
(Scrambling / Modulation)
Which of the following is not a feature of HDTV?
A varactor diode is used in________________________ stage of a TV receiver.
FM modulator is used in_____________________ section of a TV transmitter.
(Audio / Video)
The picture tube of a TV receiver is known as_____________________.
(Visual tube / Cathode ray tube)
As compared to other storage media, a CD has lower signal-to-noise ratio. (True/False)
HF biasing is used in________________________.
(Magnetic tape recording / DVD recording)
Optical recording system needs a motor. (True/False)
In a CD recorder, the stage that combines digital data with error control and sync word is:
The play time of a DVD is: