Q. How does temperature affect the performance of a diode in a series-parallel circuit?
-
A.
Increases forward voltage drop
-
B.
Decreases reverse leakage current
-
C.
Increases reverse breakdown voltage
-
D.
Decreases forward current
Solution
As temperature increases, the forward voltage drop of a diode typically increases, affecting its performance.
Correct Answer:
A
— Increases forward voltage drop
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Q. How does the total resistance change in a series-parallel circuit when more resistors are added in parallel?
-
A.
Total resistance increases
-
B.
Total resistance decreases
-
C.
Total resistance remains the same
-
D.
Total resistance becomes infinite
Solution
Adding more resistors in parallel decreases the total resistance of the circuit.
Correct Answer:
B
— Total resistance decreases
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Q. In a series-parallel circuit, how does a BJT operate when used as a switch?
-
A.
In cutoff mode, it conducts current
-
B.
In saturation mode, it blocks current
-
C.
In saturation mode, it conducts current
-
D.
In active mode, it blocks current
Solution
A BJT operates in saturation mode to allow maximum current flow, effectively acting as a closed switch.
Correct Answer:
C
— In saturation mode, it conducts current
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Q. In a series-parallel circuit, what is the effect of connecting multiple diodes in parallel?
-
A.
Increases total voltage
-
B.
Increases total current capacity
-
C.
Decreases total current capacity
-
D.
Has no effect on current
Solution
Connecting multiple diodes in parallel increases the total current capacity of the circuit.
Correct Answer:
B
— Increases total current capacity
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Q. In semiconductor physics, what happens to the resistance of a diode when it is forward-biased?
-
A.
Resistance increases
-
B.
Resistance decreases
-
C.
Resistance remains constant
-
D.
Resistance becomes infinite
Solution
When a diode is forward-biased, its resistance decreases, allowing current to flow easily.
Correct Answer:
B
— Resistance decreases
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Q. In small-signal models, what does the small-signal parameter 'gm' represent for BJTs?
-
A.
Transconductance
-
B.
Input resistance
-
C.
Output resistance
-
D.
Current gain
Solution
'gm' represents transconductance, which is the ratio of the change in output current to the change in input voltage.
Correct Answer:
A
— Transconductance
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Q. What happens to the output voltage of an OP-AMP in a series-parallel circuit when the input exceeds the supply voltage?
-
A.
Output voltage increases indefinitely
-
B.
Output voltage saturates at the supply voltage
-
C.
Output voltage decreases
-
D.
Output voltage becomes zero
Solution
When the input exceeds the supply voltage, the output voltage of an OP-AMP saturates at the supply voltage.
Correct Answer:
B
— Output voltage saturates at the supply voltage
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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 primary advantage of using series-parallel configurations in circuits?
-
A.
Increased voltage only
-
B.
Increased current only
-
C.
Increased power handling
-
D.
Decreased complexity
Solution
Series-parallel configurations allow for increased power handling by combining the benefits of both series and parallel connections.
Correct Answer:
C
— Increased power handling
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Q. What is the primary characteristic of a rectifier in a series-parallel circuit?
-
A.
It converts AC to DC
-
B.
It amplifies AC signals
-
C.
It filters noise from signals
-
D.
It stores energy
Solution
Rectifiers are designed to convert alternating current (AC) to direct current (DC) in circuits.
Correct Answer:
A
— It converts AC to DC
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Q. What is the primary function of a diode in a series-parallel circuit?
-
A.
To amplify signals
-
B.
To allow current to flow in one direction
-
C.
To store electrical energy
-
D.
To resist current flow
Solution
Diodes are used to allow current to flow in one direction, making them essential in rectifying circuits.
Correct Answer:
B
— To allow current to flow in one direction
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Q. What is the primary purpose of using a voltage divider in a series-parallel circuit?
-
A.
To increase voltage
-
B.
To decrease voltage
-
C.
To isolate components
-
D.
To amplify signals
Solution
A voltage divider is used to decrease voltage to a desired level in a circuit.
Correct Answer:
B
— To decrease voltage
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Q. What is the role of a FET in a series-parallel circuit?
-
A.
To provide high input impedance
-
B.
To amplify AC signals only
-
C.
To act as a current source only
-
D.
To rectify AC signals
Solution
FETs are known for their high input impedance, making them suitable for various applications in series-parallel circuits.
Correct Answer:
A
— To provide high input impedance
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Q. What is the role of an FET in a series-parallel circuit?
-
A.
To provide high input impedance
-
B.
To increase current flow
-
C.
To decrease voltage levels
-
D.
To act as a voltage regulator
Solution
FETs are known for their high input impedance, making them suitable for various applications in circuits.
Correct Answer:
A
— To provide high input impedance
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Q. What is the small-signal model used for in analyzing circuits with BJTs?
-
A.
To determine the DC operating point
-
B.
To analyze the frequency response
-
C.
To calculate power dissipation
-
D.
To measure input impedance
Solution
The small-signal model is used to analyze the frequency response of BJTs in circuits.
Correct Answer:
B
— To analyze the frequency response
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Q. What type of rectifier is commonly used in series-parallel circuits to convert AC to DC?
-
A.
Half-wave rectifier
-
B.
Full-wave rectifier
-
C.
Bridge rectifier
-
D.
All of the above
Solution
All types of rectifiers can be used in series-parallel circuits depending on the application requirements.
Correct Answer:
D
— All of the above
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Q. Which configuration of an OP-AMP is commonly used in series-parallel circuits for signal amplification?
-
A.
Inverting configuration
-
B.
Non-inverting configuration
-
C.
Differential configuration
-
D.
Voltage follower configuration
Solution
The non-inverting configuration is commonly used for signal amplification in series-parallel circuits.
Correct Answer:
B
— Non-inverting configuration
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