Introduction to Electronics & Communication Engineering (Set-2)
Which component is used to control current in an electronic circuit?
A Inductor
B Resistor
C Capacitor
D Transistor
A resistor is used to limit or control the flow of electric current in a circuit. It provides resistance and helps regulate voltage levels, ensuring proper functionality of electronic components.
Which of the following materials is commonly used as a semiconductor?
A Gold
B Aluminum
C Silicon
D Copper
Silicon is the most widely used semiconductor material in electronics. It has the ideal electrical properties for controlling current flow in semiconductor devices like transistors and diodes, making it crucial for modern electronics.
What does RF stand for in communication systems?
A Radio Frequency
B Resonant Frequency
C Radio Function
D Radiant Frequency
RF stands for Radio Frequency, referring to the range of electromagnetic frequencies used for wireless communication. RF signals are essential for radio, TV broadcasts, cell phones, and other communication systems.
Which of the following is used to store digital data in a circuit?
A Microprocessor
B Antenna
C Capacitor
D Flip-flop
A flip-flop is a type of digital electronic circuit that stores binary data. It acts as a memory element, holding a value of either 0 or 1, and is a fundamental building block in digital electronics.
What is the primary use of a diode in electronic circuits?
A Oscillation
B Filtering
C Rectification
D Amplification
A diode is primarily used for rectification, which converts alternating current (AC) into direct current (DC). It only allows current to flow in one direction, making it ideal for power supply circuits.
What does the term ‘bandwidth’ refer to in communication systems?
A Transmission speed
B Signal frequency range
C Noise level
D Signal strength
Bandwidth refers to the range of frequencies a communication system can transmit effectively. It determines the data rate or amount of information that can be transmitted over a channel in a given time period.
Which device is used to increase voltage in a circuit?
A Transformer
B Inductor
C Resistor
D Capacitor
A transformer is used to increase or decrease voltage in an AC circuit by using the principle of electromagnetic induction. It can step up or step down voltage levels based on the turns ratio of its coils.
Which electronic component is used to store an electric charge temporarily?
A Diode
B Inductor
C Capacitor
D Transistor
A capacitor stores electric charge temporarily and releases it when needed. It is used for filtering, smoothing signals, and providing energy storage in power supplies and other electronic circuits.
What does the term ‘modulation’ refer to in communication systems?
A Amplifying a signal
B Changing the amplitude of a signal
C Changing the frequency of a signal
D Encoding information on a carrier wave
Modulation involves encoding information (audio, video, or data) onto a carrier wave, enabling it to be transmitted over long distances. It is essential for wireless communication systems like radio, TV, and mobile networks.
Which of the following is a function of an embedded system?
A Data processing
B Specific task execution
C File management
D General-purpose computing
Embedded systems are designed to perform specific tasks or functions. Unlike general-purpose computers, they are optimized for applications like controlling machinery, processing sensor data, and managing devices in real time.
What does VLSI stand for in electronics?
A Visual Logic System Integration
B Variable Logic System Integration
C Very Large Scale Integration
D Very Low Speed Integration
VLSI stands for Very Large Scale Integration, which refers to the process of integrating thousands or millions of transistors onto a single chip. It enables the development of powerful, compact electronic devices like microprocessors.
Which of the following is used to detect the presence of a signal in communication systems?
A Detector
B Filter
C Oscillator
D Amplifier
A detector in communication systems is used to demodulate a received signal, extracting the original information (such as voice or data) from the modulated carrier wave. It plays a crucial role in signal reception.
What does IoT enable in electronic systems?
A Signal processing
B Data storage
C Local network
D Internet connectivity
IoT (Internet of Things) enables devices and systems to connect to the internet, allowing them to collect and exchange data with other devices. This connectivity is key to smart homes, automated industries, and healthcare applications.
Which of the following signals is characterized by discrete levels?
A Carrier signal
B Sinusoidal signal
C Digital signal
D Analog signal
A digital signal is characterized by discrete levels or values, typically represented by binary (0 or 1). It is used in modern computing and communication systems for efficient data processing and transmission.
Which of the following is a common modulation technique used in digital communication?
A QAM
B PM
C FM
D AM
Quadrature Amplitude Modulation (QAM) is a common modulation technique used in digital communication, where both the amplitude and phase of the carrier signal are varied to encode information. It is widely used in broadband communication systems.