Most switches used for safety controls in HVAC circuits:
A) Are normally open and wired in parallel with the load they protect.
B) Are normally closed and wired in parallel with the load they protect.
C) Are normally closed and wired in series with the load they protect.
D) Are normally open and wired in series with the load they protect.
Question 2
One advantage relay logic systems have over solid-state logic systems is that:
A) They can control more functions. B) They consume less power.
C) They are not affected by noisy power signals. D) They are faster.
Gallery of Xylosandrus crassiusculus split open, with pupae and black fungus
(A) Closed (or simple) fracture and (B) open (or compound) fracture.
Building competency in safety
An example of a Material Safety Data Sheet (MSDS).
Climate Controls: A Summary
Four types of covalent modifications that controls that activities of enzymes