Provide definitions for the following terms: semiconductor, diode, and transistor.
What will be an ideal response?
A semiconductor can act as both an insulator and a conductor. Common semiconductor materials are silicon (Si) and germanium (Ge).
A diode is an electronic one-way check valve that only allows electrical flow in one direction.
A transistor is an electronic relay. The word is a combination of the two words, transfer and resist. It is a very fast switch with no movable parts and no contacts that can burn. It can either resist electrical flow altogether or allow a predetermined amount of current to flow.
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The inventory shows 28,144 pounds of plate steel. A storage tank is welded using 26,841 pounds of plate steel. How many pounds of plate steel are left in inventory?
The inventory of a scrap pile is as follows: Channel iron, 87” Plate steel, 147” Key stock, 45” Pipe, 69” Flat iron strap, 208” A pipe support is welded using the following materials from the scrap pile: Channel iron, 61” Plate steel, 106” Key stock, 39” Pipe, 22” Flat iron strap, 189”
A(n) ____________________ or ____________________ is the concrete base that provides a solid,
level foundation for brick, stone, or block walls.
Fill in the blank(s) with the appropriate word(s).The ____ control is active only when both traces are being displayed at the same time.
a. Add—Alt—Chop b. AC—GND—DC c. Auto—normal d. Int—Line—Ext
To ensure that the rafters or joists do not interfere with installation of the plenums on a curb-mounted rooftop unit:
A) The roof joists or rafters are cut out where the curb is installed. B) The roof curb must be square with the roof joists or rafters. C) The roof curb must be installed diagonal to the roof joists or rafters. D) The plenums are fabricated in place with the roof joists or rafters passing through them.