If the voltage at the output lead of a three-wire sensor decreases when the sensor is activated, it is a __________ device.
A. sourcing
B. sinking
Answer: B
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A(n) ____________________ is the lowest possible melting temperature of an alloy.
Fill in the blank(s) with the appropriate word(s).
In a building whose structural system consists of columns, beams, and floor and roof slabs, the columns are spaced at 40 ft on center in one direction and 25 ft on center in the other direction. What is the tributary area for an interior column?
A) 500 ft2 B) 1,000 ft2 C) 1,000 ft D) 250 ft2 E) None of the above
If continued resistance readings, taken with a megohmmeter, indicate that the resistance from the compressor windings to ground is decreasing, chances are that ____________________ has entered the system.
Fill in the blank(s) with the appropriate word(s).
Each of 16 students measured the circumference of a tennis ball by four different methods, which were:
Method A: Estimate the circumference by eye. Method B: Measure the diameter with a ruler, and then compute the circumference. Method C: Measure the circumference with a ruler and string. Method D: Measure the circumference by rolling the ball along a ruler. The results (in cm) are as follows, in increasing order for each method: Method A: 18.0, 18.0, 18.0, 20.0, 22.0, 22.0, 22.5, 23.0, 24.0, 24.0, 25.0, 25.0, 25.0, 25.0, 26.0, 26.4. Method B: 18.8, 18.9, 18.9, 19.6, 20.1, 20.4, 20.4, 20.4, 20.4, 20.5, 21.2, 22.0, 22.0, 22.0, 22.0, 23.6. Method C: 20.2, 20.5, 20.5, 20.7, 20.8, 20.9, 21.0, 21.0, 21.0, 21.0, 21.0, 21.5, 21.5, 21.5, 21.5, 21.6. Method D: 20.0, 20.0, 20.0, 20.0, 20.2, 20.5, 20.5, 20.7, 20.7, 20.7, 21.0, 21.1, 21.5, 21.6, 22.1, 22.3. a. Compute the mean measurement for each method. b. Compute the median measurement for each method. c. Compute the 20% trimmed mean measurement for each method. d. Compute the first and third quartiles for each method. e. Compute the standard deviation of the measurements for each method. f. For which method is the standard deviation the largest? Why should one expect this method to have the largest standard deviation? g. Other things being equal, is it better for a measurement method to have a smaller standard deviation or a larger standard deviation? Or doesn’t it matter? Explain.