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Digital Electronics - Combinational Logic Circuits

Exercise : Combinational Logic Circuits - Filling the Blanks
16.
Parity generators and checkers use ________ gates.
exclusive-AND
exclusive-OR/NOR
exclusive-OR
exclusive-NAND
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
The 7447A is a BCD-to-7-segment decoder with ripple blanking input and output functions. The purpose of these lines is to ________.
turn off the display for any nonsignificant digit
turn off the display for any zero
turn off the display for leading or trailing zeros
test the display to assure all segments are operational
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
One reason for using the sum-of-products form is that it can be implemented using all ________ gates without much difficulty.
NOR
NAND
AND
DOOR
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
When an open occurs on the input of a CMOS gate, the output will ________.
go LOW, because there is no current in an open circuit
react as if the open input were a HIGH
go HIGH, since full voltage appears across an open
be unpredictable; it may go HIGH or LOW
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
To subtract a signed number (the subtrahend) from another signed number (the minuend) in the 2's complement system, the minuend is ________.
complemented only if it is positive
complemented only if it is negative
always complemented
never complemented
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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