Answer the following statement(s) true (T) or false (F)
1. Direct current is used for various electrochemical processes, including electroplating, refining of copper and aluminum, electrotyping, production of industrial gases by electrolysis, and charging of storage batteries.
2. A basic knowledge of trigonometry is essential to an understanding of alternating-current concepts.
3. If the generator has two pairs of poles, then a cycle is generated every half-revolution, or 2 hertz per second.
4. Alternating-voltage waveforms are all sine waves.
5. In electronics, the frequencies used cover a very narrow range.
1. True
2. True
3. True
4. False
5. False
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The plugging chisel has a tapered blade for cutting or cleaning mortar joints or for removing a brick or block from a wall.
Answer the following statement true (T) or false (F)
What type of weld is shown in Figure 3?
a. Slot
b. Spot
c. Seam
d. Stud
e. Surfacing
Which of the following is not a component of the Internet?
a. e-mail b. search engines c. blogs d. digital cameras
Smut can overwinter in soil, plant debris, and seed
Indicate whether the statement is true or false