A device intended to provide protection from the effects of arc faults is called a(n) __________ circuit breaker.
a. ground fault circuit interrupter
b. arc fault circuit interrupter
c. special protection
d. fuse
b. arc fault circuit interrupter
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Determine whether each of the following random variables is discrete or continuous.
a. The number of heads in 100 tosses of a coin. b. The length of a rod randomly chosen from a day’s production. c. The final exam score of a randomly chosen student from last semester’s engineering statistics class. d. The age of a randomly chosen Colorado School of Mines student. e. The age that a randomly chosen Colorado School of Mines student will be on his or her next birthday.
(a) As explained in Sec. 10.10, a ternary alloy may have a ternary eutectic point, at which four phases may coexist. Describe the nature of these four phases. How many degrees of freedom are there when the four phases coexist in a ternary alloy? What is the meaning of this?
(b) A ternary alloy may also have a three?phase field. How many degrees of freedom will there be in the three?phase field? Explain the significance of this number of degrees of freedom. (c) In a ternary alloy a single?phase field may also occur. How many degrees of freedom will it contain?
Which one of the following statements about troubleshooting ladder logic counter programs is NOT true?
A) Test counters starting with last in the sequence, and then add one counter at a time. Use the temporary end instruction, TND. B) If reset is present, verify that all counter driven functions are complete or reached the correct ACC value before the reset. C) Use the suspend instruction, SUS, to verify status values for all registers and bits at critical points in the ladder. D) Most difficult counter programs to verify have multiple cascaded counters and reset instructions.
The type ________ fire extinguisher is the most common on construction sites
A) B B) ABCD C) AB D) ABC