What is a plate-girder and where is it needed?
What will be an ideal response?
A plate girder is made from three steel plates welded together to form an I-section. It is required where the standard, heaviest W-section (depth = 44 in.) is structurally inadequate. One of the common uses of a plate girder is as a transfer beam (girder), so called because it is used to transfer the load from a column above to two end supports of the plate girder.
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Changes to the drawings will be noted in the _____.
a. approval block
b. legend
c. revision block
d. title block
Zoning regulations force ____ activities to be grouped together
A) like B) unlike C) ?major D) varying
SCRs designed to switch currents of ____ or more may indicate some leakage current when tested.
a. 40 amperes b. 50 amperes c. 60 amperes d. 70 amperes
PROBLEM 3.73 The design of a machine element calls for a 40-mm-outer-diameter shaft to transmit 45 kW. (a) If the speed of rotation is 720 rpm, determine the maximum shearing stress in shaft a. (b) If the speed of rotation can be increased 50% to 1080 rpm, determine the largest inner diameter of shaft b for which the maximum shearing stress will be the same in each shaft
