Q. In a capacitor, what does the term 'capacitance' refer to?
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A.
The ability to resist current
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B.
The ability to store charge per unit voltage
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C.
The ability to conduct electricity
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D.
The ability to dissipate heat
Solution
Capacitance is defined as the amount of charge stored per unit voltage across the capacitor.
Correct Answer:
B
— The ability to store charge per unit voltage
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Q. In a series circuit with capacitors, how is the total capacitance calculated?
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A.
It is the sum of all capacitances
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B.
It is the product of all capacitances
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C.
It is the reciprocal of the sum of the reciprocals
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D.
It is the maximum capacitance
Solution
In a series circuit, the total capacitance is calculated as the reciprocal of the sum of the reciprocals of individual capacitances.
Correct Answer:
C
— It is the reciprocal of the sum of the reciprocals
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Q. In a small-signal model, how is a capacitor typically represented?
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A.
As an open circuit
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B.
As a short circuit
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C.
As a resistor
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D.
As a dependent source
Solution
In small-signal models, capacitors are often represented as short circuits at high frequencies.
Correct Answer:
B
— As a short circuit
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Q. In small-signal models, how is a capacitor represented?
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A.
As an open circuit
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B.
As a short circuit
-
C.
As a resistor
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D.
As a dependent source
Solution
In small-signal models, capacitors are often represented as open circuits at DC steady state.
Correct Answer:
A
— As an open circuit
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Q. What is the effect of increasing the frequency on the reactance of a capacitor?
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A.
Reactance increases
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B.
Reactance decreases
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C.
Reactance remains the same
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D.
Reactance becomes infinite
Solution
The reactance of a capacitor decreases with increasing frequency, allowing more AC current to pass.
Correct Answer:
B
— Reactance decreases
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Q. What is the effect of increasing the voltage across a capacitor?
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A.
It decreases the capacitance
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B.
It increases the stored charge
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C.
It causes the capacitor to short circuit
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D.
It has no effect
Solution
Increasing the voltage across a capacitor increases the amount of charge stored, as capacitance is constant.
Correct Answer:
B
— It increases the stored charge
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Q. What is the effect of temperature on the capacitance of a ceramic capacitor?
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A.
Capacitance increases with temperature
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B.
Capacitance decreases with temperature
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C.
Capacitance remains unchanged
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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 primary difference between electrolytic and ceramic capacitors?
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A.
Size and voltage rating
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B.
Polarity and capacitance value
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C.
Temperature coefficient and frequency response
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D.
Cost and availability
Solution
Electrolytic capacitors are polarized and typically have higher capacitance values, while ceramic capacitors are non-polarized.
Correct Answer:
B
— Polarity and capacitance value
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Q. What is the primary function of a capacitor in an electronic circuit?
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A.
To store electrical energy
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B.
To amplify signals
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C.
To rectify AC to DC
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D.
To provide feedback
Solution
Capacitors store electrical energy in an electric field, which can be released when needed.
Correct Answer:
A
— To store electrical energy
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Q. What is the primary use of capacitors in rectifier circuits?
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A.
To increase voltage
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B.
To filter out noise
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C.
To store energy
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D.
To convert AC to DC
Solution
Capacitors are used in rectifier circuits to filter out noise and smooth the output voltage.
Correct Answer:
B
— To filter out noise
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Q. What type of capacitor is commonly used for high-frequency applications?
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A.
Electrolytic capacitor
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B.
Ceramic capacitor
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C.
Tantalum capacitor
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D.
Film capacitor
Solution
Ceramic capacitors are preferred for high-frequency applications due to their low inductance.
Correct Answer:
B
— Ceramic capacitor
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Q. Which of the following is a common application of capacitors in AC circuits?
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A.
Filtering
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B.
Amplification
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C.
Rectification
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D.
Switching
Solution
Capacitors are commonly used for filtering in AC circuits to smooth out voltage fluctuations.
Correct Answer:
A
— Filtering
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Q. Which of the following is a common application of capacitors in circuits?
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A.
Signal filtering
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B.
Current amplification
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C.
Voltage regulation
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D.
Power generation
Solution
Capacitors are commonly used for signal filtering to remove unwanted frequencies.
Correct Answer:
A
— Signal filtering
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Q. Which of the following is a common application of capacitors in power supply circuits?
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A.
Voltage regulation
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B.
Signal amplification
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C.
Energy storage
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D.
Phase shifting
Solution
Capacitors are commonly used in power supply circuits for energy storage to smooth out voltage fluctuations.
Correct Answer:
C
— Energy storage
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Q. Which type of capacitor is known for having a high capacitance value in a small package?
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A.
Ceramic capacitor
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B.
Electrolytic capacitor
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C.
Tantalum capacitor
-
D.
Film capacitor
Solution
Tantalum capacitors are known for their high capacitance values in small sizes.
Correct Answer:
C
— Tantalum capacitor
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