Embedded unit-5

What is the primary purpose of a data compressor in digital communications?

• To encrypt data

• To reduce the size of the data

• To increase the speed of the processor

• To store more data

Which algorithm is commonly used for lossless data compression?

• FFT (Fast Fourier Transform)

• DCT (Discrete Cosine Transform)

• Huffman Coding

• RSA Encryption

An alarm clock embedded system is most likely to use which of the following to keep time accurately?

• A resistor-capacitor (RC) oscillator

• A crystal oscillator

• A digital counter

• A software timer

In audio players, the DAC stands for:

• Digital Audio Controller

• Data Access Control

• Digital-to-Analog Converter

• Direct Audio Coder

A software modem is also known as a:

• Winmodem

• Hardmodem

• Sysmodem

• Softmodem

The primary sensor used in a digital still camera is a:

• A) CCD (Charge-Coupled Device)

• B) CMOS (Complementary Metal-Oxide-Semiconductor)

• C) PIR (Passive Infrared Sensor)

• D) Both A and B

What is the main advantage of using CMOS sensors over CCD in digital cameras?

• Higher power consumption

• Better image quality in low light

• Lower cost and power consumption

• More complex circuitry

Telephone answering machines typically store messages in:

• Magnetic tapes

• Vinyl records

• Digital memory

• Analogue tapes

The main function of an engine control unit (ECU) in a vehicle is to:

• Control the air conditioning system

• Manage the engine's fuel and ignition systems

• Regulate the audio system

• Monitor the vehicle's speed

A video accelerator is used to:

• Increase internet bandwidth for streaming

• Enhance video playback quality

• Improve graphics rendering speeds

• Compress video files