Introduction to Electronics & Communication Engineering (Set-4)
Which of the following is an example of a digital circuit?
A Inductor
B Oscillator
C Flip flop
D Amplifier
A flip flop is a basic digital circuit used for storing binary data. It has two stable states and can be used in applications like memory storage and timing circuits in digital electronics.
What is the primary function of an antenna in communication systems?
A Signal transmission and reception
B Signal filtering
C Signal modulation
D Signal amplification
An antenna is used to transmit and receive electromagnetic waves, converting electrical signals into radio waves and vice versa. It is critical for wireless communication systems such as radios and cell phones.
What is the role of a resistor in a circuit?
A Amplify signal
B Limit current
C Store energy
D Regulate voltage
A resistor limits the flow of electrical current in a circuit by providing resistance. This is important for controlling current to prevent damage to sensitive components like transistors and microprocessors.
Which of the following is used to convert DC to AC?
A Transistor
B Oscillator
C Rectifier
D Inverter
An inverter is used to convert direct current (DC) to alternating current (AC), which is required for powering most household appliances and industrial machines.
Which electronic component is primarily used for amplifying signals?
A Resistor
B Capacitor
C Transistor
D Diode
A transistor is used to amplify signals in electronic circuits. It works by controlling the flow of current between two terminals based on a small input signal, providing amplification for both analog and digital signals.
What is the purpose of a capacitor in an electronic circuit?
A Control current flow
B Store electrical energy
C Rectify signals
D Amplify signals
A capacitor stores electrical energy in an electric field and releases it when needed. It is used for filtering, smoothing power supplies, and coupling signals between different parts of a circuit.
What does ‘microelectronics’ refer to in the context of electronics?
A Small electronic components
B Optical communication
C Large scale electronics
D High frequency circuits
Microelectronics refers to the design and manufacture of very small electronic components, such as microchips, transistors, and integrated circuits. These components are fundamental to modern devices like computers, smartphones, and medical equipment.
Which of the following devices is used to store data in computers?
A Transistor
B Resistor
C Capacitor
D Hard drive
A hard drive is a data storage device used in computers and other electronic devices. It stores digital information magnetically on rotating platters and is essential for saving files, applications, and operating systems.
What is the primary function of a diode in a circuit?
A Store energy
B Amplify signals
C Allow current flow in one direction
D Regulate voltage
A diode allows current to flow in only one direction, making it useful for converting alternating current (AC) to direct current (DC) and protecting circuits from reverse voltage damage.
What is the purpose of a voltage divider in a circuit?
A Divide voltage into smaller parts
B Increase voltage
C Regulate current
D Store voltage
A voltage divider is a simple circuit that uses two resistors to divide an input voltage into smaller, proportional voltages. It is often used to create reference voltages for other components in a circuit.
What is the main advantage of digital signals over analog signals?
A Higher bandwidth requirements
B Continuous range of values
C More sensitive to noise
D Easier to process
Digital signals are easier to process than analog signals because they consist of discrete values (typically 0 and 1). This makes them more robust against noise and allows for more efficient storage and transmission.
What does a transformer do in an electrical circuit?
A Rectify signals
B Amplify current
C Increase or decrease voltage
D Convert DC to AC
A transformer is used to change the voltage in an AC circuit. It can either step up (increase) or step down (decrease) the voltage, making it essential in power distribution systems.
Which of the following is an example of an analog signal?
A Sine wave
B Square wave
C Binary signal
D Digital pulse
A sine wave is a smooth, continuous analog signal that represents values that vary in a continuous manner. Analog signals like sine waves are used in applications such as audio and radio communications.
What does the term ‘impedance’ refer to in electronic circuits?
A Storage of electrical energy
B Resistance to alternating current
C Resistance to current flow
D Resistance to voltage
Impedance refers to the total opposition to alternating current (AC) in a circuit, including both resistance and reactance. It determines how much current will flow in an AC circuit when a voltage is applied.
What is the primary function of a microprocessor?
A Generate signals
B Amplify signals
C Store data
D Control circuit operations
A microprocessor is the central processing unit (CPU) of a computer or embedded system. It executes instructions, processes data, and controls the operations of other components in the system.