Introduction to Electronics & Communication Engineering (Set-13)
What is the primary goal of automation in electronic systems?
A Data analysis
B Process control and efficiency
C Signal filtering
D Energy storage
Automation in electronic systems aims to control processes with minimal human intervention, improving efficiency, consistency, and safety. It is widely used in industries, robotics, and IoT systems for optimizing operations and reducing errors.
What is the main function of signal modulation in communication systems?
A Amplify signal power
B Change signal frequency
C Encode data for transmission
D Enhance signal strength
Signal modulation is the process of encoding data onto a carrier signal by varying its amplitude, frequency, or phase. This makes it suitable for transmission over various mediums, ensuring reliable data delivery in communication systems.
What does the term ‘data transmission’ refer to in communication systems?
A Encrypting data
B Analyzing data
C Sending data from one point to another
D Storing data
Data transmission is the process of sending data over a communication medium from one point to another. This can be done via various methods, including wired connections, wireless signals, or optical fibers, depending on the system.
Which modulation technique is most commonly used in FM radio broadcasting?
A Quadrature Modulation
B Frequency Modulation
C Amplitude Modulation
D Phase Modulation
Frequency Modulation (FM) is commonly used in radio broadcasting. It varies the frequency of the carrier wave to encode information, typically sound, making it less susceptible to noise and providing high quality audio signals.
What is the role of an actuator in an automated system?
A Process data inputs
B Control the system’s operations
C Perform physical actions based on signals
D Detect physical conditions
Actuators are devices used in automation systems to perform physical actions such as moving parts, opening valves, or adjusting positions based on signals from sensors or controllers. They convert electrical signals into mechanical movement.
Which type of signal is typically used in digital communication?
A Discrete
B Analog
C Continuous
D Sine wave
Digital communication systems use discrete signals, typically represented by binary values (0 and 1). These signals are robust against noise, easier to process, and more efficient for transmitting data over long distances.
What is the purpose of a demodulator in a communication system?
A Amplify signals
B Decode the received signal
C Store data
D Modulate signals
A demodulator is used to decode the modulated signal by extracting the original data from the carrier wave. This is crucial in communication systems, where information is transmitted over various frequencies and then demodulated for use.
What is the role of a filter in electronic communication systems?
A Transmit signals
B Encode signals
C Remove unwanted frequencies
D Amplify signals
Filters are used to remove unwanted frequencies from signals. They allow certain frequencies to pass while blocking others, helping to clean up the signal, reduce noise, and improve signal quality in communication systems.
Which type of communication system is most commonly used for satellite communication?
A Wired communication
B Fiber optic communication
C Optical communication
D Wireless communication
Satellite communication uses wireless communication systems to transmit signals between ground stations and satellites. This allows for long distance communication, including broadcasting, internet access, and GPS, by relying on radio waves or microwaves.
What is the primary advantage of using digital modulation techniques in modern communication?
A Greater data security and efficiency
B Higher power consumption
C Higher noise sensitivity
D Simpler hardware
Digital modulation techniques provide greater data security and efficiency because they encode information in binary form, which is less susceptible to noise and interference. They also allow for better error detection and correction, ensuring reliable data transmission.
Which component is responsible for converting electrical signals into sound in communication systems?
A Microphone
B Speaker
C Oscillator
D Antenna
A speaker is responsible for converting electrical signals into sound waves. It does this by vibrating a diaphragm in response to electrical signals, producing audible sound in communication systems like radios, phones, and public address systems.
What is the primary function of a microcontroller in an automated system?
A Store and retrieve data
B Process large datasets
C Control external devices
D Transmit signals
A microcontroller in an automated system manages and controls external hardware components like sensors, motors, and displays. It receives input, processes data, and outputs the appropriate control signals to perform specific tasks.
What is the function of signal amplification in communication systems?
A Remove noise
B Increase data rate
C Increase signal strength
D Convert data formats
Signal amplification increases the strength of weak signals to ensure they can travel longer distances without significant loss. This is essential for communication systems, ensuring reliable transmission of audio, video, and data signals.
What is the advantage of using wireless communication over wired communication?
A Greater mobility and flexibility
B Reduced interference
C Lower cost
D Higher signal strength
Wireless communication allows users to move freely without being confined by physical wires. This flexibility and mobility are essential for mobile phones, Wi Fi, Bluetooth, and satellite communication, offering convenience in modern communication systems.
What is the primary role of a sensor in an automated communication system?
A Generate power
B Process data
C Control data transmission
D Monitor environmental conditions
Sensors are used to monitor various environmental conditions, such as temperature, humidity, motion, and light. They provide real time data to the system, allowing automated systems to make decisions or trigger actions based on the sensor readings.