Introduction to Electronics & Communication Engineering (Set-8)
What is the primary function of optical communication?
A Signal modulation
B Data transmission via light
C Power transmission
D Signal amplification
Optical communication uses light signals to transmit data over long distances through fiber optic cables. It provides high bandwidth and low signal loss, making it ideal for high speed internet and telecommunications.
Which component is used to amplify signals in wireless communication systems?
A Amplifier
B Transmitter
C Modulator
D Antenna
An amplifier boosts the strength of weak signals in wireless communication systems. It is essential for increasing the signal’s reach and clarity, enabling reliable data transmission over long distances or through obstacles.
What does the term ‘modulation’ refer to in communication systems?
A Signal amplification
B Signal detection
C Data storage
D Signal encoding for transmission
Modulation is the process of modifying a carrier wave to encode data. It allows signals to be transmitted over various mediums (e.g., radio waves, fiber optics) and is essential in both analog and digital communication systems.
Which of the following is an advantage of using wireless communication?
A High interference
B Lower bandwidth
C Flexibility and mobility
D Limited mobility
Wireless communication allows for flexible and mobile communication since devices can transmit and receive signals without physical connections. This enables applications like mobile phones, Wi Fi networks, and satellite communication.
What is the purpose of an antenna in wireless communication systems?
A Signal filtering
B Signal transmission and reception
C Signal storage
D Signal amplification
Antennas are critical for transmitting and receiving electromagnetic waves in wireless communication systems. They convert electrical signals into radio waves for transmission and vice versa for reception, enabling wireless communication.
What is the main function of a diode in optical communication systems?
A Convert electrical signals to light
B Detect signals
C Amplify signals
D Filter noise
In optical communication systems, diodes, particularly light emitting diodes (LEDs) or laser diodes, convert electrical signals into light. This light is transmitted through fiber optic cables for high speed data communication.
What type of signals are used in wireless communication?
A Optical signals only
B Analog signals only
C Both analog and digital signals
D Digital signals only
Wireless communication systems use both analog and digital signals. Analog signals are used in traditional radio broadcasting, while digital signals are used in modern cellular, Wi Fi, and satellite communications.
Which of the following is used to modulate the amplitude of a signal?
A Time modulation
B Phase modulation
C Frequency modulation
D Amplitude modulation
Amplitude modulation (AM) involves varying the amplitude of a carrier signal to encode information. This technique is widely used in AM radio broadcasting and other communication systems.
What is the function of a signal processor in wireless communication?
A Detect signals
B Process and manipulate signals
C Filter signals
D Convert signals
A signal processor in wireless communication is responsible for manipulating the signals to improve clarity, reduce noise, and ensure proper encoding and decoding of information for transmission and reception.
Which of the following components is essential for the operation of optical fiber communication systems?
A Inductor
B Capacitor
C Laser diode
D Transistor
Laser diodes are used in optical fiber communication systems to convert electrical signals into light signals. The light travels through the fiber optic cables, allowing for high speed data transmission with minimal loss.
What is the primary advantage of fiber optic communication over traditional copper cables?
A Greater bandwidth and speed
B Higher signal attenuation
C Limited transmission distance
D Higher power consumption
Fiber optic communication offers much higher bandwidth and speed compared to copper cables. It allows for the transmission of large volumes of data over long distances with minimal signal loss and electromagnetic interference.
What is the primary function of a microcontroller in wireless communication systems?
A Signal amplification
B Signal generation
C Signal modulation
D Control and processing
A microcontroller in wireless communication systems manages tasks such as signal processing, data encoding, modulation, and interfacing with other components. It acts as the brain of embedded systems in wireless communication devices.
Which of the following wireless communication technologies uses radio frequency for transmission?
A Infrared
B Optical communication
C Bluetooth
D Fiber optics
Bluetooth technology uses radio frequency to transmit data wirelessly over short distances. It is commonly used for connecting devices like phones, headphones, and computers without the need for physical cables.
What is the purpose of a modulator in wireless communication?
A Filter noise
B Amplify signals
C Encode data onto a carrier signal
D Generate signals
A modulator encodes data onto a carrier signal by varying its amplitude, frequency, or phase. This process enables the transmission of data over long distances by radio waves, facilitating wireless communication.
What is the primary role of electronic components in communication systems?
A Interconnect circuits
B Process data
C Store data
D Convert signals
Electronic components such as resistors, capacitors, transistors, and diodes are used to interconnect and facilitate the operation of communication circuits. They help in signal transmission, processing, amplification, and modulation.