As a general rule for stable flip-flop triggering, the clock pulse rise and fall times must be:
A) very short.
B) at a maximum value to enable the input control signals to stabilize.
C) of no consequence as long as the levels are within the determinate range of values.
D) very long.
A
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Intersecting walls that carry the load of floors and roofs of buildings must also be able to stretch or flex.
Answer the following statement true (T) or false (F)
Foundations are susceptible to moisture wicking into the building through capillary action from footings and foundation walls or through slabs. This can be controlled through the installation of a capillary break between the top of the footing and the foundation wall or piers, and a ____ barrier below the concrete slab floor or over the dirt floor of the crawl space.
A. vapor B. moisture C. silicon D. wooden
An electric defrost cycle is accomplished by:
A) Shutting off the compressor and energizing electric defrost heaters. B) Leaving the case fans operating and shutting off the compressor. C) Through normal use from customers opening and closing the doors. D) Shutting off the compressor and bypassing hot gas to the evaporator.
For most residential systems, a ____ cfm vacuum pump is adequate.
A. 3 B. 4 C. 5 D. 6