The emphasis in ____ is on the performance of the loop as a "regulator", i.e. disturbance rejection.
A. a servo system
B. process control
Answer: B
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What are the advantages of using artificial insemination?
What will be an ideal response?
Computer study—Influence of supports on frame behavior.
(a) Using the RISA-2D computer program, compute the initial elastic deflection at midspan of
the girder in Figure P8.44, given that the support at D is a roller. For the computer analysis,
replace the tapered members by 3-ft-long segments of constant depth whose properties are
based on each segment’s midspan dimensions; that is, there will be 9 members and 10 joints.
When you set up the problem, specify in GLOBAL that forces are to be computed at three
sections. This will produce values of forces at both ends and at the center of each segment.
To account for cracking of the reinforced concrete, assume for girder BCD that I e = 0.35I G ; for
column AB assume I e = 0.7I G (compression forces in columns reduce cracking). Since
deflections of beams and one-story rigid frames are due almost entirely to moment and not
significantly affected by the area of the member’s cross-section, substitute the gross area in
the Member Properties Table.
(b) Replace the roller at support D in Figure P8.44 by a pin to prevent horizontal displacement
of joint D, and repeat the analysis of the frame. The frame is now an indeterminate structure.
Compare your results with those in part (a), and briefly discuss differences in behavior with
respect to the magnitude of deflections and moments.
NOTE: Because reinforced concrete beams crack due to tensile stresses created by moment
and shear, initial elastic deflections are based on an empirical equation for moment of inertia
established from experimental studies of full-size beams (provided in the ACI Code). This
equation produces an effective moment of inertia I e that varies from about 0.35 to 0.5 of the
moment of inertia I G based on the gross area of the cross section. The additional deflection
due to creep and shrinkage that occurs over time, which can exceed the initial deflection, is
not considered.
Who is responsible for defining OOS criteria on highway trucks?
A. OSHA B. FMVSS C. CVSA D. ATA
Which of the following refrigerant conversions is not considered a drop-in?
a. HFC-134a for HCFC-22 b. HCFC-409A for CFC-12 c. HFC-407C for HCFC-22 d. HCFC-123 for CFC-11