?(12 - 3 1/2) ÷ 1/2 + 2 =
A. ?5
B. 19
C. ?3 2/5
D. ?6 1/4
Answer: B
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Which of the following pull stations require the user to lift a cover or open a door before operating the pull station?
a. Single-action b. Glass-break c. Key-operated d. Double-action
How does an Infrared leak detector work?
What will be an ideal response?
Water will evaporate at a slower rate when:
A) The dew point is equal to barometric pressure. B) The temperature of the water is below the point of vaporization. C) The relative humidity is high. D) The ambient air around it is at a low relative humidity.
DeviceNet is ________
A) A digital motion control network that interfaces the motion control module in the PLC with the servo motor drive through a fiber optic cable B) An open network standard that uses the producer/consumer network model to efficiently exchange time-critical application information in control systems C) A low-cost communications single cable network with input and output devices with an embedded microprocessor for network communications D) A vendor-specific network for use with Allen-Bradley hardware