What is the purpose of cooling tower fill material?
A) provides a growing surface for algae and plants that help clean the water
B) increases the rigidity of the cooling tower structure
C) slows the falling water and increases the surface exposure for evaporation
D) filters out dirt and debris from the cooling tower water
C
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Diodes that operate in the ultrahigh frequency (UHF) and microwave frequency range are known as
A) unijunction diodes B) zener diodes C) tunnel diodes D) varactors
The exact input voltage level to a digital IC that causes it to switch states is called
A) float. B) threshold. C) pull-up. D) ripple.
Which of the following is not a starting method?
A. autotransformer B. wye-delta C. automatic three-point D. plugging
Any glass or clear plastic container can be used for a terrarium
Indicate whether the statement is true or false