What is interrupt-driven I/O and what is its major advantage?
A) An I/O device needing service sends a request to the PIC (programmable interrupt controller), which in turn notifies the CPU of the request based on the assigned priority level of the specific I/O device. If there are no pending I/O requests the CPU does not have to spend time checking the I/O ports.
B) Each individual I/O device is checked sequentially on a regular basis to see if it needs to be serviced. This slows down the CPU operation.
C) Individual I/O devices regularly send inquiries to the CPU to see if it is available for a specific I/O operation; if the CPU is available, the I/O device then proceeds to carry out its operation.
D) Each individual I/O device is serviced sequentially on a regular basis by the PIC. This speeds up the I/O process.
A
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____________________ is the continuing plan of the contractor to provide quality work in every phase of the project.
Fill in the blank(s) with the appropriate word(s).
ROM stands for
A) Readable Only Memorizing. B) Random Access Memory. C) Read Only Memory. D) none of the above
How can technicians protect themselves from hot sparks produced by most welding processes?
A) Wear light weight clothing made from synthetic material. B) Use welding rods that prevent the formation of sparks. C) Wear heavy protective clothing, gloves, and eye protection. D) Use a spark arrestor to prevent any sparks from occurring during the welding process.
The likely cause of noise and potential internal damage to steam piping and traps, especially during startup
of a cold system, is _____. a. water hammer b. flash steam c. an oversized pressure regulator d. the pressure relief valve