241. How can the active condition (HIGH or LOW) or the decoder output be determined from the logic symbol?
(a) A bubble indicates active-HIGH.
(b) A bubble indicates active-LOW.
(c) A square indicates active-HIGH.
(d) A square indicates active-LOW.
242. A truth table with output columns numbered 0–15 may be for which type of decoder IC?
(a) hexadecimal 1-of-16
(b) dual octal outputs
(c) binary-to-hexadecimal
(d) hexadecimal-to-binary
243. A BCD decoder will have how many rows in its truth table?
(a) 10
(b) 9
(c) 8
(d) 3
244. What control signals may be necessary to operate a 1-line-to-16 line decoder?
(a) flasher circuit control signal
(b) a LOW on all gate enable inputs
(c) input from a hexadecimal counter
(d) a HIGH on all gate enable circuits
245. How many inputs are required for a 1-of-16 decoder?
(a) 2
(b) 4
(c) 8
(d) 16
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