When an open occurs on the input of a TTL device, the output will ________. go L

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Question
When an open occurs on the input of a TTL device, the output will ________.
Options
A. go LOW, because there is no current in an open circuit
B. react as if the open input were a HIGH
C. go HIGH, since full voltage appears across an open
D. still be good, if only the good inputs are used

Correct Answer

react as if the open input were a HIGH

Combinational Logic Circuits problems

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7. Occasionally, a particular logic expression will be of no consequence in the operation of a circuit, such as in a BCD-to-decimal converter. These result in ________ terms in the K-map and can be treated as either ________ or ________, in order to ________ the resulting term.
Options
A. don't care, 1's, 0's, simplify
B. spurious, AND's, OR's, eliminate
C. duplicate, 1's, 0's, verify
D. spurious, 1's, 0's, simplify

10. Two 4-bit comparators are cascaded to form an 8-bit comparator. The cascading inputs of the most significant 4 bits should be connected ________.
Options
A. to the outputs from the least significant 4-bit comparator
B. to the cascading inputs of the least significant 4-bit comparator
C. A = B to a logic high, A < b and a > B to a logic low
D. ground

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