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Question 1
What is a foot candle?
Correct Answer:
The amount of light produced by a lamp (lumens) divided by the area that is illuminated.
Explanation:
Foot-candle is a unit of illuminance, telling you how much light reaches a surface. It’s defined as lumens per unit area on that surface, specifically lumens per square foot. So if a lamp emits a total of 1000 lumens and those lumens land evenly on 100 square feet, the illuminance is 1000 divided by 100, which equals 10 foot-candles. That direct ratio—lumens divided by the illuminated area—is what foot-candles measure. The other ideas don’t fit as well: total lumens describes how much light a lamp emits overall (not how much lands on a surface), while lumens per square meter is lux (the metric version), and saying illuminance is measured in foot-candles is true but doesn’t express the calculation; D gives the exact relationship that defines the unit.
Question 2
What type of signal does an analog input provide to the controller?
Correct Answer:
A digital data stream.
Explanation:
An analog input provides a continuous, proportional electrical signal to the controller. This means the input presents a voltage (for example 0–10 V or 0–5 V) or a current (like 4–20 mA) that varies smoothly with the measured quantity, allowing the controller to read precise, intermediate values for accurate control. A digital data stream carries discrete bits of information, not a continuous measurement, so it isn’t the direct form of an analog input. PWM is a way to approximate an analog level by switching on and off with varying duty cycle; the actual analog input, however, is a steady, varying voltage or current, not a pulsed signal.
Question 3
What is LonWorks and how does it relate to DDC?
Correct Answer:
LonWorks is a control networking platform for building automation enabling distributed control across devices.
Explanation:
LonWorks is a control networking platform for building automation that enables distributed control across devices. In a DDC setup, each device (sensors, controllers, actuators) runs control logic and communicates with others. LonWorks provides the network and standards to connect these nodes so control tasks can be performed locally and coordinated across the building, making distributed digital control possible and interoperable between different vendors. It is not a simple sensor, nor a cloud analytics service, nor a telecom hardware standard.
Question 4
Which unit is used to express illuminance in the context of lighting measurements?
Correct Answer:
Foot candle.
Explanation:
Illuminance is the amount of light hitting a surface per unit area. In practical lighting practice, that per-area measure is expressed in foot-candles when using the US customary system, while the SI equivalent is lux. The other terms describe different quantities: a lumen is the total light emitted by a source (luminous flux), and a candela is light intensity in a given direction. So foot-candle is the unit used to express illuminance in certain measurement contexts, with 1 foot-candle ≈ 10.764 lux. This explains why it fits as the right choice in many lighting measurement contexts.
Question 5
Which term best describes a terminal that can display 20 to 60 lines of information?
Correct Answer:
Dumb terminal
Explanation:
A dumb terminal is a simple display device that relies on a host computer to do all the processing and to supply the data it shows. It typically displays a fixed number of text lines, such as around 20 to 60, which matches the description here. It doesn’t run programs or perform calculations locally, just presents what the host sends. The other options don’t fit this scenario: a keypad display is mainly input-focused with a basic screen; an alarm printer outputs printed alerts; a portable operator terminal implies more capability and local processing. So the terminal that best describes displaying 20 to 60 lines is a dumb terminal.
Question 1
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About this Exam

Prepare with the Direct Digital Controls and Lab Practice Test practice quiz. This question bank includes 10 questions covering device, signal, controller, lonworks, and direct. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Direct Digital Controls and Lab Practice Test

This practice set contains 10 questions from the matching question bank and focuses on device, signal, controller, lonworks, and direct. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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