Introduction to Electronics & Communication Engineering (Set-14)
What is the primary role of analog circuits in electronic systems?
A Data storage
B Signal amplification
C Power conversion
D Digital processing
Analog circuits are designed to amplify and manipulate continuous signals. These circuits are widely used in applications such as audio amplification, signal modulation, and radio frequency transmission where continuous signal manipulation is required.
What is a key characteristic of semiconductor devices like diodes and transistors?
A Voltage dependent conductivity
B Unlimited frequency response
C Infinite conductivity
D High temperature resistance
Semiconductor devices, such as diodes and transistors, have conductivity that depends on applied voltage. This allows them to control current flow in circuits, making them essential components in digital electronics and communication systems.
In signal processing, what is the primary function of a filter?
A Signal detection
B Signal modulation
C Signal separation
D Signal amplification
A filter is used in signal processing to separate specific frequencies from a signal. Filters allow certain frequencies to pass while blocking unwanted ones, improving signal quality by reducing noise and interference.
What does an embedded system primarily control in a device?
A Signal transmission
B Specific tasks or functions
C External data
D Display resolution
Embedded systems are designed to perform specific tasks within a larger device. These systems combine hardware and software to control functions like sensor readings, motor control, and data processing, as found in appliances, cars, and industrial machines.
What does the term ‘circuit analysis’ refer to in electronics?
A Generating power
B Repairing broken circuits
C Calculating voltages, currents, and power
D Designing new circuits
Circuit analysis involves studying the behavior of electrical circuits to determine voltages, currents, and power in various components. It helps engineers ensure circuits operate as intended and troubleshoot any issues within a system.
Which of the following is a primary function of a microprocessor in embedded systems?
A Amplify sound
B Control external devices
C Store data
D Filter signals
A microprocessor processes instructions and controls external devices in embedded systems. It is the “brain” of the system, executing commands to operate sensors, motors, displays, and other components based on input data.
What is the main benefit of VLSI (Very Large Scale Integration) design?
A Reduced system power
B Integration of thousands of components into a single chip
C Higher operating frequency
D Faster data transmission
VLSI design allows for the integration of thousands or even millions of transistors and other components onto a single chip, resulting in smaller, more efficient, and more cost effective electronic devices, such as microprocessors and memory chips.
Which of the following modulation techniques is used in digital communication systems?
A Phase Modulation
B Frequency Modulation
C Quadrature Amplitude Modulation
D Amplitude Modulation
Quadrature Amplitude Modulation (QAM) is commonly used in digital communication to combine both amplitude and phase modulation, allowing more data to be transmitted by encoding multiple bits per symbol.
What is the primary function of antennas in communication systems?
A Convert signals to digital
B Amplify signals
C Filter unwanted frequencies
D Transmit and receive electromagnetic waves
Antennas are critical for transmitting and receiving electromagnetic waves in communication systems. They convert electrical signals into radio waves for transmission and vice versa for reception, enabling wireless communication.
What is the role of wave propagation in communication systems?
A Filter out noise
B Amplify signals
C Transmit signals through different media
D Convert signals from analog to digital
Wave propagation describes how electromagnetic waves travel through different mediums, such as air, vacuum, or fiber optic cables. Understanding wave propagation is essential for optimizing communication systems for range and clarity.
What type of signals does an analog circuit typically handle?
A Continuous signals
B Discrete signals
C Sine wave signals
D Binary signals
Analog circuits handle continuous signals, where the voltage or current varies smoothly over time. These circuits are designed to process and amplify real world signals like sound, light, and temperature, which are naturally continuous.
In telecommunications, what is the primary function of a switch?
A Direct the flow of electrical signals
B Amplify signals
C Generate signal power
D Store data
A switch in telecommunications systems directs the flow of electrical signals between different components or channels. It allows signals to be routed, enabling communication between devices, whether it’s a telephone call or data transfer.
What is the main advantage of using digital signals in communication systems?
A Higher power consumption
B Continuous amplitude
C Less noise susceptibility
D Easier to store
Digital signals are less susceptible to noise because they are represented by discrete values (0s and 1s). This allows for more accurate data transmission and easier error detection and correction, improving signal integrity over long distances.
Which component is used to limit the amount of current in a circuit?
A Transistor
B Capacitor
C Inductor
D Resistor
A resistor is used to limit the flow of electrical current in a circuit. It provides resistance to the flow of current, ensuring that components are not damaged by excessive current and helping to control circuit behavior.
What is the primary purpose of circuit boards in electronic devices?
A Convert signals
B Connect electronic components
C Store data
D Provide power
Circuit boards, particularly printed circuit boards (PCBs), are used to connect and support electronic components in a structured layout. They provide pathways for electrical signals to travel between components, ensuring proper circuit functionality.