Explain how to determine if a packaging material is appropriate for a particular delicate instrument
What will be an ideal response?
The vibrational characteristics, especially the natural vibrational frequencies, are determined for the material by sensing the forces transmitted through the material at various frequencies. The natural frequencies of the material and other frequencies at which high stresses are transmitted are then compared to the natural frequencies of the transportation system that will carry the package. If the frequencies of the transportation system match the natural frequencies of the packaging material, and if the stresses transmitted through the material are greater that the stresses that would be required to damage the delicate part, then that packaging material is probably not appropriate.
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List four conditions that apply when a position tolerance is applied at RFS
What will be an ideal response?
Blocks are inserted xrefs are:
a. linked b. attached c. referenced d. hyperlinked
____ are designed to use the computer to lay out a printed circuit board.
A. Jumpers B. Pads C. Autorouter programs D. Paper dolls
A sinusoid x(t) = Am cos(2? fmt) modulates a sinusoidal carrier Ac cos(2? fct) in a double-sideband transmitted-carrier (DSBTC) system of the type illustrated in Figure E-12. If Am = 1, fm = 10, Ac = 4, fc = 1000 and m = 1, find the numerical value of the total signal power in y(t) at the carrier frequency Pc and the numerical value of the total signal power in y(t) in its sidebands Ps .
