Q. In terms of voltage, how does AC differ from DC?
-
A.
AC voltage is constant
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B.
DC voltage is constant
-
C.
AC voltage varies with time
-
D.
DC voltage varies with time
Solution
AC voltage varies with time, while DC voltage remains constant.
Correct Answer:
C
— AC voltage varies with time
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Q. In which application is Direct Current (DC) commonly used?
-
A.
Electric power transmission
-
B.
Battery-powered devices
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C.
Home appliances
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D.
Electric motors
Solution
Direct Current (DC) is commonly used in battery-powered devices.
Correct Answer:
B
— Battery-powered devices
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Q. What happens to the voltage in an AC circuit over time?
-
A.
It remains constant
-
B.
It increases linearly
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C.
It varies sinusoidally
-
D.
It decreases exponentially
Solution
In an AC circuit, the voltage varies sinusoidally over time.
Correct Answer:
C
— It varies sinusoidally
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Q. What is the main advantage of using AC over DC for power transmission?
-
A.
AC is easier to generate
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B.
AC can be easily transformed to higher voltages
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C.
AC is safer
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D.
AC is more efficient in small circuits
Solution
AC can be easily transformed to higher voltages, making it more efficient for long-distance power transmission.
Correct Answer:
B
— AC can be easily transformed to higher voltages
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Q. What is the main advantage of using Alternating Current (AC) for power distribution?
-
A.
Easier to convert to DC
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B.
Can be transmitted over long distances with less loss
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C.
More efficient in small devices
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D.
Safer for household use
Solution
The main advantage of using Alternating Current (AC) for power distribution is that it can be transmitted over long distances with less loss.
Correct Answer:
B
— Can be transmitted over long distances with less loss
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Q. What is the main advantage of using Alternating Current (AC) for power transmission?
-
A.
Easier to convert to different voltages
-
B.
More efficient at low voltages
-
C.
Safer for household use
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D.
Requires less insulation
Solution
The main advantage of using Alternating Current (AC) for power transmission is that it is easier to convert to different voltages.
Correct Answer:
A
— Easier to convert to different voltages
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Q. What is the primary difference between Alternating Current (AC) and Direct Current (DC)?
-
A.
AC flows in one direction only
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B.
DC flows in one direction only
-
C.
AC is used in batteries
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D.
DC is used in power plants
Solution
Direct Current (DC) flows in one direction only, while Alternating Current (AC) changes direction periodically.
Correct Answer:
B
— DC flows in one direction only
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Q. What is the primary use of an operational amplifier (op-amp) in AC circuits?
-
A.
To rectify AC to DC
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B.
To amplify AC signals
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C.
To filter DC signals
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D.
To convert AC to digital signals
Solution
The primary use of an operational amplifier (op-amp) in AC circuits is to amplify AC signals.
Correct Answer:
B
— To amplify AC signals
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Q. What is the typical frequency of household AC in the United States?
-
A.
50 Hz
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B.
60 Hz
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C.
100 Hz
-
D.
120 Hz
Solution
The typical frequency of household AC in the United States is 60 Hz.
Correct Answer:
B
— 60 Hz
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Q. What is the waveform shape of Alternating Current (AC)?
-
A.
Square wave
-
B.
Sine wave
-
C.
Triangular wave
-
D.
Constant wave
Solution
The waveform shape of Alternating Current (AC) is typically a sine wave.
Correct Answer:
B
— Sine wave
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Q. What is the waveform shape of Alternating Current?
-
A.
Square wave
-
B.
Sine wave
-
C.
Triangular wave
-
D.
Constant voltage
Solution
The waveform shape of Alternating Current (AC) is typically a sine wave.
Correct Answer:
B
— Sine wave
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Q. Which component is commonly used to smooth out the output of a rectifier?
-
A.
Resistor
-
B.
Inductor
-
C.
Capacitor
-
D.
Diode
Solution
A capacitor is commonly used to smooth out the output of a rectifier.
Correct Answer:
C
— Capacitor
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Q. Which device is commonly used to convert AC to DC?
-
A.
Transistor
-
B.
Diode
-
C.
Capacitor
-
D.
Inductor
Solution
A diode is commonly used to convert Alternating Current (AC) to Direct Current (DC) in rectification.
Correct Answer:
B
— Diode
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Q. Which of the following is a characteristic of Direct Current (DC)?
-
A.
Voltage can vary over time
-
B.
Current can reverse direction
-
C.
Current flows in one direction
-
D.
Frequency is always constant
Solution
A characteristic of Direct Current (DC) is that current flows in one direction.
Correct Answer:
C
— Current flows in one direction
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Q. Which of the following is a characteristic of Direct Current?
-
A.
It can be easily transformed
-
B.
It flows in both directions
-
C.
It has a constant polarity
-
D.
It is used in power generation
Solution
Direct Current (DC) has a constant polarity, flowing in one direction only.
Correct Answer:
C
— It has a constant polarity
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Q. Which type of current is more suitable for electronic circuits?
-
A.
Alternating Current (AC)
-
B.
Direct Current (DC)
-
C.
Both AC and DC
-
D.
Neither AC nor DC
Solution
Direct Current (DC) is more suitable for electronic circuits, as most electronic devices require a constant voltage.
Correct Answer:
B
— Direct Current (DC)
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Q. Which type of current is typically used in household electrical outlets?
-
A.
Direct Current (DC)
-
B.
Alternating Current (AC)
-
C.
Both AC and DC
-
D.
Neither AC nor DC
Solution
Household electrical outlets typically use Alternating Current (AC).
Correct Answer:
B
— Alternating Current (AC)
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