Underwriters Laboratories standard 181 B covers:
A) Methods of connecting and sealing ductboard.
B) Methods of connecting and sealing metal duct.
C) Methods of connecting and sealing flexible duct.
D) Methods of connecting and sealing all types of duct.
C
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____ voltage is the design or configuration voltage of the electrical distribution system.
a. Nominal b. Terminal c. High d. Magnetic
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The 54XX TTL IC series is the military version and has
A) a wider temperature range. B) more stringent power supply requirements. C) higher current output capability. D) all of the above.
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A flip-flop is a discrete electronic component
Indicate whether the statement is true or false
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Which of the following is not a type of geometric tolerance?
A. straightness B. runout C. location D. form E. none of the above
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