Q. In interfacing, what does PWM stand for?
-
A.
Pulse Width Modulation
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B.
Pulse Wave Measurement
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C.
Phase Width Modulation
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D.
Pulse Wave Modulation
Solution
PWM stands for Pulse Width Modulation, a technique used to control the power delivered to electrical devices.
Correct Answer:
A
— Pulse Width Modulation
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Q. What is the main advantage of using a microcontroller with built-in ADC?
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A.
Lower cost
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B.
Higher speed
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C.
Reduced complexity in design
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D.
Increased power consumption
Solution
Using a microcontroller with built-in ADC reduces complexity in design by eliminating the need for external ADC components.
Correct Answer:
C
— Reduced complexity in design
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Q. What is the main advantage of using a sigma-delta ADC?
-
A.
High speed
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B.
Low power consumption
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C.
High resolution
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D.
Low cost
Solution
Sigma-delta ADCs are known for their high resolution, making them suitable for precise measurements.
Correct Answer:
C
— High resolution
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Q. What is the primary function of an analog-to-digital converter (ADC)?
-
A.
To convert digital signals to analog signals
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B.
To amplify analog signals
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C.
To convert analog signals to digital signals
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D.
To filter analog signals
Solution
An ADC converts analog signals, which are continuous in nature, into digital signals, which are discrete.
Correct Answer:
C
— To convert analog signals to digital signals
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Q. What is the purpose of a low-pass filter in an analog circuit?
-
A.
To allow high-frequency signals to pass
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B.
To block all signals
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C.
To allow low-frequency signals to pass
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D.
To amplify all signals
Solution
A low-pass filter allows low-frequency signals to pass while attenuating high-frequency signals.
Correct Answer:
C
— To allow low-frequency signals to pass
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Q. What is the role of a voltage divider in interfacing?
-
A.
To increase voltage levels
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B.
To decrease voltage levels
-
C.
To filter noise
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D.
To convert AC to DC
Solution
A voltage divider is used to decrease voltage levels to a desired value suitable for interfacing with other components.
Correct Answer:
B
— To decrease voltage levels
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Q. What is the typical output voltage range of a standard 10-bit ADC?
-
A.
0 to 5V
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B.
0 to 10V
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C.
0 to 255V
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D.
0 to 1023V
Solution
A standard 10-bit ADC typically has an output voltage range of 0 to 5V, representing values from 0 to 1023.
Correct Answer:
A
— 0 to 5V
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Q. What type of sensor would typically output a voltage proportional to the temperature?
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A.
Photodiode
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B.
Thermocouple
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C.
Resistor
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D.
Inductor
Solution
A thermocouple generates a voltage that is proportional to the temperature difference between its junctions.
Correct Answer:
B
— Thermocouple
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Q. What type of sensor would you use to measure temperature?
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A.
Photodiode
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B.
Thermistor
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C.
Accelerometer
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D.
Microphone
Solution
A thermistor is a type of temperature sensor that changes resistance with temperature variations.
Correct Answer:
B
— Thermistor
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Q. Which component is commonly used to interface sensors with microcontrollers?
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A.
Resistor
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B.
Capacitor
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C.
Operational Amplifier
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D.
Transistor
Solution
Operational amplifiers are often used to amplify sensor signals before they are processed by microcontrollers.
Correct Answer:
C
— Operational Amplifier
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Q. Which of the following describes an analog signal?
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A.
Discrete values
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B.
Continuous values
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C.
Binary values
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D.
Digital values
Solution
An analog signal is characterized by continuous values that can represent a range of information.
Correct Answer:
B
— Continuous values
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Q. Which of the following is a common application of a digital-to-analog converter (DAC)?
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A.
Reading temperature sensors
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B.
Generating audio signals
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C.
Measuring voltage levels
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D.
Filtering noise
Solution
DACs are commonly used to generate audio signals by converting digital audio data into analog signals.
Correct Answer:
B
— Generating audio signals
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Q. Which of the following is NOT a characteristic of analog signals?
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A.
Continuous in time
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B.
Infinite resolution
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C.
Discrete values
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D.
Varying amplitude
Solution
Analog signals are continuous and can take on an infinite number of values, unlike digital signals which are discrete.
Correct Answer:
C
— Discrete values
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