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. 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
Time clocks and photo cells are generally ____.
a. used to control AC motors b. provided to monitor the contactors c. provided for overload protection d. used for lighting loads