Question 1

Ground levels of all equipment must be the same voltage in order to be used.

Accepted Answer

Different equipment can operate at different voltage levels due to the use of transformers and converters that adjust voltage to the required levels for each piece of equipment.

Question 2

The Mylar foil type of shielded cable can provide a noise reduction ratio of about ____.&#10;A) 5,000:1&#10;B) 10,000:1&#10;C) 20,000:1&#10;D) 30,000:1

Accepted Answer

30,000:1

Question 3

Many of the programmable controllers found in industry are designed to accept analog as well as digital inputs.

Accepted Answer

Many programmable controllers in industry are designed to accept analog inputs, allowing them to read and process continuous values such as temperature, pressure, and flow rate, in addition to digital inputs which are more binary in nature.

Question 4

The differential amplifier detects the voltage difference between the pair of signal wires and amplifies this difference.

Accepted Answer

A differential amplifier is designed to amplify the voltage difference between two input signals. This is achieved by subtracting the voltage on one input from the voltage on the other input. The resulting difference is then amplified and output.

Question 5

When an analog input is used, such as a thermocouple for measuring temperature, a special module that mounts on the ____ is used.&#10;A) power supply&#10;B) internal relay&#10;C) cable&#10;D) I/O rack

Accepted Answer

An analog input module is typically mounted on the I/O rack, which allows for the conversion of the varying analog signal from the thermocouple into a digital signal that can be processed by the programmable logic controller (PLC). The power supply, internal relay, and cable are not directly involved in the conversion process.

Question 6

Most analog sensors produce strong signals.

Accepted Answer

Analog sensors produce signals that vary in strength based on the measured variable. They do not necessarily produce strong signals.

Question 7

Common coaxial cable offers ____.&#10;A) very poor noise reduction&#10;B) similar levels of noise reduction as shielded cable&#10;C) good noise reduction&#10;D) the best noise reduction

Accepted Answer

The answer of Common coaxial cable offers ____.&#10;A) very poor...

Question 8

Analog sensors are often used with ____ that can be used to trigger alarms and turn on or off certain processes.&#10;A) programmable valves&#10;B) actuators&#10;C) set point detectors&#10;D) variable switches

Accepted Answer

Set point detectors are used with analog sensors to trigger alarms and turn on or off certain processes based on predefined thresholds or set points.

Question 9

Try to run signal wiring as far away from power wiring as possible.

Accepted Answer

Signal wiring can pick up electrical noise from nearby power wiring, resulting in signal degradation or interference. Therefore, it is recommended to run signal wiring as far away from power wiring as possible to minimize this effect.

Question 10

An electronic device that is often used to help overcome the problem of ____ is the differential amplifier.&#10;A) induced noise&#10;B) static interference&#10;C) harmonic distortion&#10;D) spikes

Accepted Answer

Differential amplifiers are commonly used in electronic circuits as a means of reducing the impact of unwanted interference or noise. By measuring the difference between two input signals, the amplifier can effectively subtract any common-mode noise that is present in both inputs, leaving only the desired signal. Therefore, A) induced noise is the best choice for this question.

Deck 60: Analog Sensing for Programmable Controllers