Describe the BCD-to-seven-segment decoder and its display.
What will be an ideal response?
A special type of decoder is the standard 8421 BCD-to-seven-segment decoder. It accepts a BCD input code and generates a special 7-bit output code to energize a seven-segment decimal readout display. The display consists of seven LED segments that are lit in different combinations to produce each of the ten decimal digits, 0 through 9. Besides seven-segment LED displays, there are incandescent and liquid crystal (LCD) displays.
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a. used to control AC motors b. provided to monitor the contactors c. provided for overload protection d. used for lighting loads
An electrolyzer uses electricity to free hydrogen from ____.
a. water b. natural gas c. methanol d. LPG
Define the following terms below:
(a) home-based work (HBW) trips (b) home-based other (HBO) trips (c) nonhome-based (NHB) trips (d) production (e) attraction (f) origin (g) destination
Which statement summarizes the overall effect of negative-pressure ventilation?
a. it releases the contaminated atmosphere b. it pulls smoke out c. it displaces the contaminated atmosphere d. it pushes smoke out