Potentiometers and rheostats differ in that:
A) potentiometers utilize three terminals, while rheostats usually use only two terminals.
B) potentiometers utilize linear and nonlinear tapers, while rheostats usually utilize only linear tapers.
C) potentiometers are used to vary voltages, while rheostats vary currents.
D) all of these.
D
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Schematic diagrams ____.
a. are used to represent how the circuit generally appears b. show components mounted in their general location with connecting wires c. show components in their electrical sequence without regard for physical location d. show all hypothetically possible logical relations
Elements such as nickel, chromium, molybdenum, copper, or manganese can be used with this type of cast iron to increase the properties of strength, wear resistance, corrosion resistance, or heat resistance.
a. alloy cast iron b. nodular cast iron c. gray cast iron d. white cast iron
Anthropologists most commonly agree that agriculture began _____ years ago
a. 20,000 c. 10,000 b. 12,000 d. 100,000
When editing a text file with vi, if you want to save your changes and exit right away, you can use ____ or ZZ from command mode.
A. :wq B. :q! C. :se D. :sq