Question 1

Why are hysteresis comparators used in signal processing?

Accepted Answer

To stabilize output and prevent jitter near reference voltages.

Answer

To convert digital signals to analog voltage outputs effectively.

Answer

To reduce power consumption and improve circuit efficiency.

Answer

To amplify signals and increase their overall magnitude.

Question 2

What is a key feature of tri-state buffers in digital communication?

Accepted Answer

They can effectively disconnect a device from the bus to avoid conflicts.

Answer

They increase the voltage levels of digital signals quite significantly.

Answer

They always output a HIGH signal regardless of input conditions.

Answer

They can only operate in exactly two distinct logical states permanently.

Question 3

What role does Boolean algebra play in digital systems?

Accepted Answer

It provides a mathematical way to represent and evaluate true/false conditions.

Answer

It provides true representation by evaluating mathematical and digital conditions.

Answer

It evaluates mathematical conditions to represent true digital signals.

Answer

It represents mathematical evaluation of false conditions in digital systems.

Question 4

Which logical operation is used when combining individual alarm conditions to create a final alarm logic equation?

Accepted Answer

OR operation.

Answer

XOR operation

Answer

AND operation

Answer

NOT operation

Question 5

What is the typical representation of analog process variables in digital control systems?

Accepted Answer

Binary form for processing by computers and controllers.

Answer

Analog waveform signals transmitted unchanged into digital controllers.

Answer

Hexadecimal encoding of sensor outputs for direct digital manipulation.

Answer

Decimal form used directly by digital processors without conversion.

Question 6

What is the primary purpose of digital signal conditioning?

Accepted Answer

To convert analog signals from sensors into digital form for processing by computers and controllers.

Answer

To remove all forms of noise and distortion from signals while preserving their original integrity.

Answer

To directly measure and monitor physical parameters such as temperature and pressure in real-time.

Answer

To improve the precision and reliability of analog measurements before further processing.

Question 7

In Boolean Algebra, what does the AND operation signify?

Accepted Answer

True if both inputs are true.

Answer

True if at least one input is true.

Answer

True if neither input is true.

Answer

True if both inputs are false.

Question 8

What role do tri-state buffers play in bus systems?

Accepted Answer

They control whether a device can place data on a shared bus or remain in a high-impedance state.

Answer

They convert digital signals to analog signals for compatibility with mixed-signal systems.

Answer

They amplify weak signals to ensure robust transmission across long bus lines.

Answer

They store data temporarily to synchronize communication between devices.

Question 9

What does a DAC do in a digital system?

Accepted Answer

It translates a binary word into a corresponding analog voltage or current.

Answer

It stores digital data temporarily for processing by the CPU.

Answer

It converts incoming analog signals into binary code for digital processing.

Answer

It amplifies weak analog signals to improve signal-to-noise ratio.

Question 10

How does conversion resolution relate to the number of bits in a D/A converter?

Accepted Answer

More bits provide finer resolution, leading to smaller output changes per bit.

Answer

Resolution is independent of bit count and depends solely on reference voltage accuracy.

Answer

More bits increase the maximum output range, allowing larger voltage steps per bit.

Answer

Fewer bits improve resolution by reducing quantization error and signal noise.

Question 11

Why is digital signal conditioning crucial in interfacing analog sensors with digital systems?

Accepted Answer

It ensures accurate and repeatable mapping between analog inputs and digital values.

Answer

It reduces wiring complexity and interference in signal transmission paths.

Answer

It processes digital signals exclusively while ignoring analog inputs completely.

Answer

It eliminates all sensor errors and calibration requirements entirely.

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