Discussion
Decimal to BCD priority encoder, 74147 will have :
Answer: C
The 74147 has 10 inputs and 4 outputs.
The 74147 is the standard decimal-to-BCD priority encoder, described in data sheets as a 10-line to 4-line encoder: it encodes the ten decimal digits 0-9 into a 4-bit BCD code. Only nine input pins are actually provided, for 1 to 9, because the zero condition is represented when no input is active; inputs and outputs are active low, and the highest-numbered active input takes priority.
BCD needs exactly 4 output bits, so options with 8 outputs are wrong, and '8 inputs and 4 outputs' describes an octal-to-binary encoder such as the 74148.
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