How many 3-line-to-8-line decoders are required for a 1-of-32 decoder? 1 2 4 8

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Question
How many 3-line-to-8-line decoders are required for a 1-of-32 decoder?
Options
A. 1
B. 2
C. 4
D. 8

Correct Answer

4

Combinational Logic Circuits problems

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2. Based on the indications of probe A in the figure given below, what is wrong, if anything, with the circuit?
Options
A. The logic probe is unable to determine the state of the circuit at that point and is blinking to alert the technician to the problem.
B. The output appears to be shorted to V_cc, but is being pulsed by the pulser.
C. The output appears to be LOW, but is being pulsed by the pulser.
D. Nothing appears to be wrong at that point.

8. A decoder can be used as a demultiplexer by ________.
Options
A. tying all enable pins LOW
B. tying all data-select lines LOW
C. tying all data-select lines HIGH
D. using the input lines for data selection and an enable line for data input

9. Which of the following combinations of logic gates can decode binary 1101?
Options
A. One 4-input AND gate
B. One 4-input AND gate, one OR gate
C. One 4-input NAND gate, one inverter
D. One 4-input AND gate, one inverter

10. An output gate is connected to four input gates; the circuit does not function. Preliminary tests with the DMM indicate that the power is applied; scope tests show that the primary input gate has a pulsing signal, while the interconnecting node has no signal. The four load gates are all on different ICs. Which instrument will best help isolate the problem?
Options
A. Current tracer
B. Logic probe
C. Oscilloscope
D. Logic analyzer

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