Q. In a series circuit with a BJT, what happens to the collector current when the base current increases?
A.
It decreases
B.
It remains the same
C.
It increases
D.
It becomes zero
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Solution
In a BJT, the collector current is proportional to the base current, so an increase in base current results in an increase in collector current.
Correct Answer:
C
— It increases
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Q. In a series circuit with an operational amplifier, what is the role of feedback?
A.
To increase the input impedance
B.
To stabilize the gain
C.
To decrease the output voltage
D.
To isolate the input from the output
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Solution
Feedback in an operational amplifier circuit helps to stabilize the gain and improve linearity.
Correct Answer:
B
— To stabilize the gain
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Q. In a series circuit, what happens to the voltage across each component if the total voltage is constant and the resistance of one component increases?
A.
Voltage across all components increases
B.
Voltage across all components decreases
C.
Voltage across the increased resistance increases
D.
Voltage across the increased resistance decreases
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Solution
If the total voltage is constant and the resistance of one component increases, the voltage across that component will increase.
Correct Answer:
C
— Voltage across the increased resistance increases
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Q. In a series circuit, what is the effect of adding more resistors on the total resistance?
A.
Total resistance decreases
B.
Total resistance increases
C.
Total resistance remains the same
D.
Total resistance becomes zero
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Solution
Adding more resistors in series increases the total resistance of the circuit.
Correct Answer:
B
— Total resistance increases
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Q. In a series circuit, what is the effect of increasing the total resistance on the current flow?
A.
Current increases
B.
Current decreases
C.
Current remains the same
D.
Current becomes zero
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Solution
According to Ohm's law, increasing the total resistance in a series circuit decreases the current flow.
Correct Answer:
B
— Current decreases
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Q. In a series circuit, what is the total voltage across multiple diodes?
A.
It is the sum of the individual diode voltages
B.
It is the average of the diode voltages
C.
It is the maximum diode voltage
D.
It is zero
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Solution
In a series circuit, the total voltage is the sum of the individual diode voltages.
Correct Answer:
A
— It is the sum of the individual diode voltages
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Q. In an op-amp configured as a voltage follower in a series circuit, what is the output voltage compared to the input voltage?
A.
Higher than the input voltage
B.
Lower than the input voltage
C.
Equal to the input voltage
D.
Unpredictable
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Solution
An op-amp in a voltage follower configuration outputs a voltage that is equal to the input voltage.
Correct Answer:
C
— Equal to the input voltage
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Q. In an op-amp configured as a voltage follower in a series circuit, what is the output voltage relative to the input voltage?
A.
Higher than the input voltage
B.
Lower than the input voltage
C.
Equal to the input voltage
D.
Inverted compared to the input voltage
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Solution
An op-amp in a voltage follower configuration outputs a voltage that is equal to the input voltage, providing high input impedance and low output impedance.
Correct Answer:
C
— Equal to the input voltage
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Q. In semiconductor physics, what happens to the resistance of a diode when it is forward-biased in a series circuit?
A.
Resistance increases
B.
Resistance decreases
C.
Resistance remains constant
D.
Resistance becomes infinite
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Solution
When a diode is forward-biased, its resistance decreases, allowing current to flow easily through the series circuit.
Correct Answer:
B
— Resistance decreases
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Q. What happens to the total current in a series circuit when the resistance increases?
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
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Solution
According to Ohm's law, if the resistance increases in a series circuit, the total current decreases.
Correct Answer:
B
— It decreases
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Q. What happens to the voltage across a diode in a series circuit when it is reverse-biased?
A.
It becomes zero
B.
It increases
C.
It decreases
D.
It becomes negative
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Solution
When a diode is reverse-biased, the voltage across it increases until it reaches the breakdown voltage, at which point it can conduct in reverse.
Correct Answer:
B
— It increases
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Q. What is the effect of adding a FET in series with a load?
A.
It decreases the load resistance
B.
It increases the load current
C.
It controls the load current
D.
It short-circuits the load
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Solution
A FET can control the load current based on the gate voltage applied, allowing for variable control in series circuits.
Correct Answer:
C
— It controls the load current
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Q. What is the primary characteristic of a rectifier in a series circuit?
A.
To convert AC to DC
B.
To amplify signals
C.
To increase frequency
D.
To decrease voltage
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Solution
A rectifier's primary function is to convert alternating current (AC) to direct current (DC) in series circuits.
Correct Answer:
A
— To convert AC to DC
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Q. What is the primary characteristic of a series rectifier circuit?
A.
It allows AC to pass through
B.
It converts AC to DC
C.
It increases the frequency of the input signal
D.
It decreases the voltage
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Solution
A series rectifier circuit converts alternating current (AC) to direct current (DC) by allowing current to flow in one direction.
Correct Answer:
B
— It converts AC to DC
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Q. What is the primary function of a diode in a series circuit?
A.
To amplify current
B.
To allow current to flow in one direction
C.
To store electrical energy
D.
To increase voltage
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Solution
A diode allows current to flow in one direction, making it essential for controlling current in series circuits.
Correct Answer:
B
— To allow current to flow in one direction
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Q. What is the primary purpose of a series voltage regulator?
A.
To increase voltage
B.
To decrease voltage
C.
To maintain a constant output voltage
D.
To convert AC to DC
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Solution
A series voltage regulator is designed to maintain a constant output voltage despite variations in input voltage or load conditions.
Correct Answer:
C
— To maintain a constant output voltage
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Q. What is the role of a bypass capacitor in a series circuit with an op-amp?
A.
To increase gain
B.
To filter out noise
C.
To decrease output impedance
D.
To stabilize voltage
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Solution
A bypass capacitor is used to filter out noise in a series circuit with an op-amp, improving the stability and performance of the circuit.
Correct Answer:
B
— To filter out noise
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Q. What is the small-signal model of a diode used for in a series circuit?
A.
To analyze large signal behavior
B.
To simplify AC analysis
C.
To determine power loss
D.
To measure capacitance
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Solution
The small-signal model of a diode is used to simplify the analysis of AC signals in a series circuit.
Correct Answer:
B
— To simplify AC analysis
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Q. What is the small-signal model of a diode used for in series circuits?
A.
To analyze high-frequency behavior
B.
To determine DC operating points
C.
To simplify AC analysis
D.
To measure voltage drop
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Solution
The small-signal model of a diode is used to simplify AC analysis in series circuits, allowing for easier calculations of circuit behavior.
Correct Answer:
C
— To simplify AC analysis
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Q. What is the small-signal model used for in series circuits?
A.
To analyze large signal behavior
B.
To simplify the analysis of linear circuits
C.
To measure power consumption
D.
To determine frequency response
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Solution
The small-signal model is 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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