Digital Electronics - ECE Questions and Answers

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In a NOT gate the output is always the opposite of the input.

True

False

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"Micro-programming" is a technique

for programming the microprocessors

for writing small programs efficiently

for programming the control steps of a computer

for programming output/input

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Status register in the 8156 contains information about

the timer

the ports

both (a) and (b)

none of the above

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The noise margin of a TTL gate is about

0.2 V

0.4 V

0.6 V

0.8 V

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TTL circuit with active pull up is preferred because of its suitability for

wired AND operation

bus operated system

wired logic operation

reasonable dissipation and speed of operation

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A parity check usually can detect

one-bit error

double-bit error

three-bit error

any-bit error

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Which of the following is 'synchronous'?

Half adder

Full adder

R-S flip-flop

Clocked R-S flip-flop

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TRAP is __________ whereas RST 7.5, RST 6.5, RST 5.5 are __________ .

maskable, non-maskable

maskable, maskable

non-maskable, non-maskable

non-maskable, maskable

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For a binary half subtractor having two inputs A and B the correct sets of logical expressions for the outputs D (A - B) and X = Borrow are

D = AB + AB, X = AB

D = AB AB, X = AB

D = AB + AB, X = AB

D = AB + A B, X = AB