Q. What is the energy band gap in a semiconductor?
-
A.
The energy required to free an electron
-
B.
The energy of the conduction band
-
C.
The energy of the valence band
-
D.
The energy lost in conduction
Solution
The energy band gap is the energy required to free an electron from the valence band to the conduction band.
Correct Answer:
A
— The energy required to free an electron
Learn More →
Q. What is the final voltage across a capacitor in an RC circuit after a long time?
-
A.
0V
-
B.
V0
-
C.
V0/2
-
D.
V0*e^(-t/RC)
Solution
After a long time, the voltage across the capacitor in an RC circuit approaches the supply voltage V0.
Correct Answer:
B
— V0
Learn More →
Q. What is the first usable IP address in the subnet 10.0.0.0/8?
-
A.
10.0.0.0
-
B.
10.0.0.1
-
C.
10.0.0.255
-
D.
10.255.255.255
Solution
The first usable IP address in the subnet 10.0.0.0/8 is 10.0.0.1, as 10.0.0.0 is the network address.
Correct Answer:
B
— 10.0.0.1
Learn More →
Q. What is the formula for calculating the total resistance in a series circuit?
-
A.
R_total = R1 + R2 + R3
-
B.
R_total = R1 x R2 x R3
-
C.
R_total = R1 / R2 / R3
-
D.
R_total = R1 - R2 - R3
Solution
In a series circuit, the total resistance is the sum of all individual resistances, R_total = R1 + R2 + R3.
Correct Answer:
A
— R_total = R1 + R2 + R3
Learn More →
Q. What is the formula for the time constant in an RL circuit?
-
A.
L/R
-
B.
R/L
-
C.
L+R
-
D.
R-L
Solution
The time constant (τ) in an RL circuit is given by τ = L/R, where L is inductance and R is resistance.
Correct Answer:
A
— L/R
Learn More →
Q. What is the formula for the time response of a first-order RC circuit to a step input?
-
A.
V(t) = V_final(1 - e^(-t/τ))
-
B.
V(t) = V_final(e^(-t/τ))
-
C.
V(t) = V_initial + (V_final - V_initial)(1 - e^(-t/τ))
-
D.
V(t) = V_initial + (V_final - V_initial)e^(-t/τ)
Solution
The time response of a first-order RC circuit to a step input is given by V(t) = V_initial + (V_final - V_initial)(1 - e^(-t/τ)).
Correct Answer:
C
— V(t) = V_initial + (V_final - V_initial)(1 - e^(-t/τ))
Learn More →
Q. What is the forward voltage drop of a typical silicon diode?
-
A.
0.2V
-
B.
0.7V
-
C.
1.2V
-
D.
0.5V
Solution
A typical silicon diode has a forward voltage drop of approximately 0.7V when conducting.
Correct Answer:
B
— 0.7V
Learn More →
Q. What is the function of a capacitor in a dynamic RAM (DRAM) cell?
-
A.
To amplify signals
-
B.
To store charge
-
C.
To switch states
-
D.
To rectify signals
Solution
In a dynamic RAM (DRAM) cell, the capacitor is used to store charge, which represents the binary data.
Correct Answer:
B
— To store charge
Learn More →
Q. What is the function of a common-emitter configuration in a BJT?
-
A.
To provide high input impedance
-
B.
To provide voltage gain
-
C.
To provide current gain only
-
D.
To act as a switch
Solution
The common-emitter configuration provides voltage gain, making it a popular choice for amplification.
Correct Answer:
B
— To provide voltage gain
Learn More →
Q. What is the function of a coupling capacitor in an amplifier circuit?
-
A.
To block DC and allow AC signals
-
B.
To amplify the signal
-
C.
To provide feedback
-
D.
To stabilize the power supply
Solution
Coupling capacitors are used to block DC components while allowing AC signals to pass through, facilitating signal transfer between stages.
Correct Answer:
A
— To block DC and allow AC signals
Learn More →
Q. What is the function of a decoder in combinational logic?
-
A.
To encode data
-
B.
To convert binary to decimal
-
C.
To select a specific output line
-
D.
To perform addition
Solution
A decoder converts binary input into a unique output line, effectively selecting one of many outputs based on the input combination.
Correct Answer:
C
— To select a specific output line
Learn More →
Q. What is the function of a decoder in digital logic?
-
A.
To convert binary data to decimal
-
B.
To select a specific output line based on input
-
C.
To perform addition of binary numbers
-
D.
To store data temporarily
Solution
A decoder takes binary input and activates one specific output line corresponding to the input value.
Correct Answer:
B
— To select a specific output line based on input
Learn More →
Q. What is the function of a firewall?
-
A.
To speed up internet connection
-
B.
To protect against unauthorized access
-
C.
To store data securely
-
D.
To manage network traffic
Solution
A firewall is a security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.
Correct Answer:
B
— To protect against unauthorized access
Learn More →
Q. What is the function of a multiplexer?
-
A.
To amplify signals
-
B.
To select one of many inputs and forward it to a single output
-
C.
To perform binary addition
-
D.
To store data temporarily
Solution
A multiplexer selects one of several input signals and forwards the selected input into a single line.
Correct Answer:
B
— To select one of many inputs and forward it to a single output
Learn More →
Q. What is the function of a NOT gate?
-
A.
Inverts the input
-
B.
Outputs the same input
-
C.
Combines inputs
-
D.
None of the above
Solution
A NOT gate inverts its input; if the input is 1, the output is 0, and vice versa.
Correct Answer:
A
— Inverts the input
Learn More →
Q. What is the function of a peak detector circuit using an op-amp?
-
A.
To measure average voltage
-
B.
To store the peak value of an input signal
-
C.
To filter out AC components
-
D.
To amplify low-level signals
Solution
A peak detector circuit stores the peak value of an input signal, allowing for measurement of maximum signal levels.
Correct Answer:
B
— To store the peak value of an input signal
Learn More →
Q. What is the function of a pull-up resistor in a switch circuit?
-
A.
To increase current
-
B.
To ensure a defined logic level when the switch is open
-
C.
To decrease voltage
-
D.
To store charge
Solution
A pull-up resistor ensures that a defined logic level (high) is present when the switch is open.
Correct Answer:
B
— To ensure a defined logic level when the switch is open
Learn More →
Q. What is the function of a rectifier in an AC circuit?
-
A.
To increase voltage
-
B.
To convert AC to DC
-
C.
To decrease voltage
-
D.
To filter signals
Solution
Rectifiers convert alternating current (AC) into direct current (DC) by allowing current to flow in one direction.
Correct Answer:
B
— To convert AC to DC
Learn More →
Q. What is the function of a rectifier in power supply circuits?
-
A.
To increase voltage
-
B.
To convert AC to DC
-
C.
To filter noise
-
D.
To amplify signals
Solution
The primary function of a rectifier is to convert alternating current (AC) to direct current (DC).
Correct Answer:
B
— To convert AC to DC
Learn More →
Q. What is the function of a sample-and-hold circuit in an ADC?
-
A.
To amplify the input signal
-
B.
To convert the signal to digital
-
C.
To maintain a constant voltage level during conversion
-
D.
To filter out noise
Solution
A sample-and-hold circuit captures and holds the input voltage constant during the analog-to-digital conversion process.
Correct Answer:
C
— To maintain a constant voltage level during conversion
Learn More →
Q. What is the function of a Schmitt trigger in op-amp circuits?
-
A.
To amplify weak signals
-
B.
To provide hysteresis in signal switching
-
C.
To filter out high-frequency noise
-
D.
To integrate input signals
Solution
A Schmitt trigger provides hysteresis in signal switching, which helps to eliminate noise and provide clean transitions between high and low states.
Correct Answer:
B
— To provide hysteresis in signal switching
Learn More →
Q. What is the function of a Schmitt trigger?
-
A.
To amplify weak signals
-
B.
To provide hysteresis in signal processing
-
C.
To rectify AC signals
-
D.
To store binary data
Solution
A Schmitt trigger is used to provide hysteresis in signal processing, ensuring clean transitions between high and low states.
Correct Answer:
B
— To provide hysteresis in signal processing
Learn More →
Q. What is the function of a small-signal model in electronics?
-
A.
To analyze large signal behavior
-
B.
To simplify the analysis of linear circuits
-
C.
To design power amplifiers
-
D.
To measure frequency response
Solution
Small-signal models are used to simplify the analysis of linear circuits by approximating the behavior around a bias point.
Correct Answer:
B
— To simplify the analysis of linear circuits
Learn More →
Q. What is the function of a testbench in HDL?
-
A.
To synthesize the design
-
B.
To simulate the design
-
C.
To implement the design
-
D.
To document the design
Solution
A testbench is used to simulate the design and verify its functionality by applying test inputs and observing outputs.
Correct Answer:
B
— To simulate the design
Learn More →
Q. What is the function of a VLAN Access Control List (VACL)?
-
A.
To filter traffic between VLANs
-
B.
To manage VLAN configurations
-
C.
To monitor VLAN performance
-
D.
To assign VLANs to ports
Solution
A VLAN Access Control List (VACL) is used to filter traffic between VLANs, providing a way to enforce security policies.
Correct Answer:
A
— To filter traffic between VLANs
Learn More →
Q. What is the function of a VPN in network security?
-
A.
To increase bandwidth
-
B.
To create a secure connection over a public network
-
C.
To manage network devices
-
D.
To monitor network traffic
Solution
A VPN (Virtual Private Network) creates a secure connection over a public network, ensuring privacy and security.
Correct Answer:
B
— To create a secure connection over a public network
Learn More →
Q. What is the function of a Zener diode?
-
A.
To rectify AC signals
-
B.
To allow current to flow in one direction only
-
C.
To provide voltage regulation
-
D.
To amplify signals
Solution
A Zener diode is used for voltage regulation by allowing current to flow in the reverse direction when a specific voltage is reached.
Correct Answer:
C
— To provide voltage regulation
Learn More →
Q. What is the function of an operating system?
-
A.
To manage hardware and software resources
-
B.
To provide internet access
-
C.
To run applications only
-
D.
To store data permanently
Solution
An operating system manages hardware and software resources and provides a user interface.
Correct Answer:
A
— To manage hardware and software resources
Learn More →
Q. What is the function of an operational amplifier (op-amp) in a circuit?
-
A.
To rectify AC signals
-
B.
To amplify voltage signals
-
C.
To switch currents
-
D.
To store charge
Solution
An op-amp is primarily used to amplify voltage signals in various applications.
Correct Answer:
B
— To amplify voltage signals
Learn More →
Q. What is the function of an operational amplifier (op-amp) in a feedback configuration?
-
A.
To increase the input voltage
-
B.
To stabilize the output voltage
-
C.
To amplify the difference between two input voltages
-
D.
To convert AC signals to DC
Solution
An op-amp amplifies the difference between its inverting and non-inverting inputs in a feedback configuration.
Correct Answer:
C
— To amplify the difference between two input voltages
Learn More →
Showing 451 to 480 of 1509 (51 Pages)
