Q. What is the effect of negative feedback in op-amp circuits?
-
A.
Increases gain
-
B.
Decreases gain and improves stability
-
C.
Increases distortion
-
D.
Eliminates noise completely
Solution
Negative feedback decreases gain and improves stability in op-amp circuits, leading to better performance.
Correct Answer:
B
— Decreases gain and improves stability
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Q. What is the effect of temperature on semiconductor behavior in series-parallel circuits?
-
A.
Increases resistance
-
B.
Decreases resistance
-
C.
No effect on resistance
-
D.
Increases capacitance
Solution
As temperature increases, the resistance of semiconductors typically decreases due to increased carrier mobility.
Correct Answer:
B
— Decreases resistance
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Q. What is the effect of temperature on the capacitance of a ceramic capacitor?
-
A.
Capacitance increases with temperature
-
B.
Capacitance decreases with temperature
-
C.
Capacitance remains unchanged
-
D.
Capacitance fluctuates randomly
Solution
The capacitance of ceramic capacitors typically decreases with increasing temperature.
Correct Answer:
B
— Capacitance decreases with temperature
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Q. What is the efficiency of an ideal transformer?
-
A.
0%
-
B.
50%
-
C.
100%
-
D.
75%
Solution
An ideal transformer has an efficiency of 100%, meaning no energy is lost.
Correct Answer:
C
— 100%
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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
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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
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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
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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
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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))
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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Q. What is the function of an operational amplifier (op-amp) in arithmetic operations?
-
A.
To perform addition and subtraction
-
B.
To amplify signals only
-
C.
To filter signals
-
D.
To convert digital signals to analog
Solution
Op-amps can be configured to perform various arithmetic operations, including addition and subtraction.
Correct Answer:
A
— To perform addition and subtraction
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Q. What is the function of an operational amplifier in arithmetic operations?
-
A.
To perform addition and subtraction
-
B.
To amplify signals only
-
C.
To act as a voltage regulator
-
D.
To convert AC to DC
Solution
Operational amplifiers can perform various arithmetic operations, including addition and subtraction.
Correct Answer:
A
— To perform addition and subtraction
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Q. What is the function of the emitter in a BJT?
-
A.
To inject charge carriers
-
B.
To collect charge carriers
-
C.
To control the base current
-
D.
To provide biasing
Solution
The emitter in a BJT is responsible for injecting charge carriers into the base region.
Correct Answer:
A
— To inject charge carriers
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Q. What is the hexadecimal equivalent of the binary number 1010?
Solution
The binary number 1010 is equivalent to A in the hexadecimal number system.
Correct Answer:
A
— A
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Q. What is the input impedance of an ideal op-amp?
-
A.
Zero
-
B.
Finite
-
C.
Infinite
-
D.
Depends on the configuration
Solution
An ideal op-amp has infinite input impedance, which means it draws no current from the input source.
Correct Answer:
C
— Infinite
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Q. What is the main advantage of using a Field Effect Transistor (FET) in memory applications?
-
A.
Higher power consumption
-
B.
Lower input impedance
-
C.
Higher input impedance
-
D.
More complex fabrication
Solution
FETs have a higher input impedance, which makes them suitable for memory applications as they draw less current from the preceding stage.
Correct Answer:
C
— Higher input impedance
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Q. What is the main advantage of using a PLD over traditional logic circuits?
-
A.
Lower cost
-
B.
Higher power consumption
-
C.
Increased design time
-
D.
Flexibility in design
Solution
PLDs offer flexibility in design, allowing for quick changes and adaptations compared to traditional fixed logic circuits.
Correct Answer:
D
— Flexibility in design
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