The seven basic SI units are derived from the metric system of physical units. What does the unit Mole (mol) stand for?
A. Temperature
B. Amount of substance
C. Length
D. Time
B
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Pancake-type solid-state sensors are designed to detect targets at distances up to ____.
a. 2.0 in. b. 4.0 in. c. 6.0 in. d. 8.0 in.
The final choice of piping material for many applications, including fuel gases, is often controlled by _____
a. building codes b. the material cost c. personal preference d. the installing contractor
Which of the following statements is true?
A) The accumulator decrements by the time base value when the timer instruction is false. B) Timer parameters can only be entered into the timer instructions in the ladder. C) PLC 5 and SLC 500 have time bases of 1, 0.1, 0.01, and 0.001 seconds. D) PLC 5 and SLC 500 both use timer file, T4, with each timer assigned a unique number from 0 to 255.
Regardless of the insulation value, ____ is the most critical element in overhead doors, and finding units with high performance of this element is a challenge.
A. air leakage B. conduction C. heat loss D. lighting