Technician A says pulse width modulation is the duration of on time, but not connected to a specific cycle time. Technician B says duty cycle is measured in percentages. Who is correct?
A. Technician A
B. Technician B
C. Both A and B
D. Neither A nor B
Answer: C
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____ shingles are the most commonly used roofing for residential and light commercial roof construction.
A. Wood B. Asphalt C. Slate D. Cement-fiber
Reinforcing bars should be _____.
a. heated with a torch before bending b. bent no more than 90 degrees c. lubricated before bending d. bent cold
The ordinates of the moment influence line at midspan B of a 2-span continuous beam are provided at every one-tenth of the span in Figure P12.56. (a) Position the AASHTO HL-93 design truck and lane loads in Figure 12.25f to produce the maximum moment. (b) Position the AASHTO HL-93 design tandem and lane loads shown in Figure 12.25(g) to produce the maximum positive moment. Which loading is more critical?
Beams are primarily designed to resist ____ forces.
A. torsion B. tension C. bending D. shear