The compensator in an automatic level uses ____ to maintain a true level line of sight.
a.gravity
b.electricity
c.magnetism
d.air pressure
ANS: A
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The diac can operate ____ polarity.
A. only on positive B. only on negative C. on either D. only without
Answer the following statement(s) true (T) or false (F)
1. Most access control systems are connected to the buildings network through a CAT 5 cable. 2. Wiring and cabling for all access control systems must comply with Article 300 of the National Electrical Code. 3. Most door and window contacts are “normally closed”. 4. The installation of class two power sources must comply with Article 725 of the National Electrical Code. 5. The type of sensing device to use in a access control systems typically depends on the layout of the building and the detail in which you need protection.
The concept of layered components that make up an operating system also originated with UNIX. Briefly describe this concept as it applies to UNIX/Linux systems.
What will be an ideal response?
Which of the following grooving methods does not remove any material from the pipe?
A) Roll grooving B) Single grooving C) Dual grooving D) Cut grooving