Describe the procedure for purging a two pipe system?
What will be an ideal response?
The two pipe system is self purging, but typically it takes more than one safety timing period to clear all the air. Pushing the reset a couple of times may be necessary.
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Power outlets that supply on-stage portable switchboards shall be _____.
a. internally operated b. remotely operated c. externally operated d. automatically operated
What type of pump is a typical oil pump?
A) Hydraulically driven B) Centrifugal C) Positive displacement D) Piston-type
Which one of the following statements is not true for the PLC 5 and SLC 500 counters?
A) Counters store negative values in the in 2's complement format. B) The PRE is 16 bit integer memory register that stores the count value or set point for the number of counts to trigger an output. C) The ACC stores the count value by incrementing one count for every true to false change in the counter ladder rung. D) A reset instruction (RES) is used to return the ACC to zero.
Cables are ____.
A. used to connect components, equipment assemblies, or systems together B. made up of insulated conductor wires, protective outer jacket, or some other means of holding the wires together, and connectors at one end or both ends C. the part of the electrical transmission system where electricity is switched or transformed from a very high voltage to a conveniently usable form for distribution to homes or businesses D. both a and b E. all of the above