Introduction to Electronics & Communication Engineering (Set-3)
Which of the following is the primary purpose of an amplifier in electronics?
A Signal modulation
B Signal amplification
C Signal transmission
D Signal storage
An amplifier increases the strength of weak electrical signals. It is used in audio systems, radios, and communication devices to ensure that the signal can be transmitted or processed effectively.
What is the role of a microcontroller in embedded systems?
A Store data
B Process data
C Modulate signals
D Control external devices
A microcontroller is a compact integrated circuit designed to control external devices such as motors, sensors, and displays in embedded systems. It executes specific tasks based on programmed instructions.
Which component is used for filtering noise from a signal?
A Filter
B Inductor
C Resistor
D Capacitor
A filter is used to remove unwanted noise or frequencies from a signal. It allows certain frequencies to pass while attenuating others, ensuring a cleaner signal for processing or transmission.
What is the main function of a rectifier in electronics?
A Storing energy
B Filtering signals
C Converting AC to DC
D Amplifying signals
A rectifier converts alternating current (AC) to direct current (DC), which is essential for powering electronic devices. It allows current to flow in only one direction, making it suitable for DC circuits.
Which of the following is a key characteristic of a digital signal?
A Variable amplitude
B Discrete values
C Infinite frequency
D Continuous amplitude
A digital signal has discrete levels, typically represented as binary values (0 and 1). Unlike analog signals, which have continuous amplitude, digital signals are more resistant to noise and distortion.
Which technology is used in wireless communication systems to transmit data over long distances?
A Optical fibers
B Wi Fi
C Radio waves
D Infrared
Radio waves are electromagnetic waves used to transmit data wirelessly over long distances. They are used in radio, television, mobile communication, and Wi Fi networks, enabling wireless data transfer.
What is the purpose of a voltage regulator in electronic circuits?
A To maintain a constant voltage
B To store energy
C To reduce noise
D To increase voltage
A voltage regulator ensures that the voltage supplied to a circuit remains stable, despite variations in the input or load conditions. It is vital in protecting sensitive electronic components from voltage fluctuations.
Which of the following devices is used for signal modulation in communication systems?
A Diode
B Resistor
C Transistor
D Modulator
A modulator is a device used to modify a carrier signal to carry information. Modulation involves altering the amplitude, frequency, or phase of the carrier signal to encode data for transmission.
What is the main function of a switch in an electronic circuit?
A Changing voltage
B Filtering signals
C Opening or closing the circuit
D Amplifying current
A switch is used to open or close a circuit, controlling the flow of current. It allows for turning a device on or off or directing the current to different parts of the circuit as needed.
Which of the following is a common application of VLSI technology?
A Microprocessor design
B Signal amplification
C Noise filtering
D Power transmission
VLSI (Very Large Scale Integration) technology is used to design microprocessors, which are essential for modern computing. VLSI allows for the integration of millions of transistors on a single chip, enabling compact and powerful processors.
What does the term ‘semiconductor’ refer to in electronics?
A Voltage regulation
B Signal amplification
C Resistance to DC
D A material that can conduct or insulate depending on conditions
A semiconductor is a material that has properties between a conductor and an insulator. It can conduct electricity under certain conditions, making it ideal for use in electronic components like diodes and transistors.
What is the primary function of an oscillator in electronic circuits?
A Amplify signals
B Modulate signals
C Generate signals
D Rectify signals
An oscillator generates periodic waveforms, such as sine or square waves, which are essential in communication, signal processing, and timing applications. It serves as a frequency source for various electronic systems.
What does the term ‘frequency’ refer to in communication systems?
A Signal strength
B Number of cycles per second
C Signal modulation
D Signal power
Frequency refers to the number of cycles a signal completes in one second, measured in Hertz (Hz). It determines the pitch of sound signals and is a critical factor in communication systems for data transmission.
Which of the following is used to prevent overcurrent in electronic circuits?
A Fuse
B Diode
C Resistor
D Capacitor
A fuse is a safety device used to protect electronic circuits from overcurrent conditions. It melts and breaks the circuit when the current exceeds a safe limit, preventing damage to components.
Which of the following components stores data in a digital system?
A Transistor
B Resistor
C Flip flop
D Capacitor
A flip flop is a small, fast storage location in a digital system that holds data temporarily. It is used by microprocessors to store instructions, data, or addresses during processing.