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Electronics
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Testing and Troubleshooting
Comments
Question
The control of digital circuits is usually achieved with _________.
Options
A. random pulses
B. clock signals
C. sophisticated gating
D. selected frequencies
Correct Answer
clock signals
Testing and Troubleshooting problems
Search Results
1. The ideal test equipment to use for locating shorts in digital circuitry is the ________ and _______.
Options
A. logic probe, clip
B. logic pulser, logic probe
C. current tracer, logic pulser
D. current tracer, logic clip
Show Answer
Scratch Pad
Discuss
Correct Answer: current tracer, logic pulser
2. An open collector output can ________ current, but it cannot ___________________.
Options
A. sink, source current
B. source, sink current
C. sink, source voltage
D. source, sink voltage
Show Answer
Scratch Pad
Discuss
Correct Answer: sink, source current
3. Totem pole outputs _________ be connected __________ because ____________.
Options
A. can, in parallel, sometimes higher current is required
B. cannot, together, if the outputs are in opposite states excessively high currents can damage one or both devices
C. should, in series, certain applications may require higher output voltage
D. can, together, together they can handle larger load currents and higher output voltages
Show Answer
Scratch Pad
Discuss
Correct Answer: cannot, together, if the outputs are in opposite states excessively high currents can damage one or both devices
4. When the output of a standard TTL gate is HIGH, it can ___________________.
Options
A. sink 16 mA of current from the attached input gates
B. source 400 µA of current to no more than 10 attached gates
C. source 16 mA of current to no more than 10 attached gates
D. sink a maximum of 400 µA from no more than 10 load gates
Show Answer
Scratch Pad
Discuss
Correct Answer: source 400 µA of current to no more than 10 attached gates
5. The number of inputs that a gate output can drive without possible logic errors is the _______.
Options
A. propagation delay
B. noise margin
C. speed-power product
D. fanout
Show Answer
Scratch Pad
Discuss
Correct Answer: fanout
6. Erratic or unexplained digital circuit activity is often due to _________.
Options
A. a glitch
B. a random pulse
C. clock frequency changes
D. a change in slew rate
Show Answer
Scratch Pad
Discuss
Correct Answer: clock frequency changes
7. "Train" and "single" is the mode selection for a _______.
Options
A. multimeter
B. logic probe
C. current tracer
D. logic pulser
Show Answer
Scratch Pad
Discuss
Correct Answer: logic pulser
8. The device that would best aid in open track detection is a(n) ________.
Options
A. multimeter
B. current tracer
C. logic probe
D. oscilloscope
Show Answer
Scratch Pad
Discuss
Correct Answer: current tracer
9. In order for a logic probe to operate, its red and black leads must first be connected to a ________.
Options
A. logic clip
B. HIGH or TRUE signal
C. power source
D. logic pulser
Show Answer
Scratch Pad
Discuss
Correct Answer: power source
10. The use of a logic probe may be improved through the use of a(n) ________.
Options
A. logic clip
B. frequency counter
C. oscilloscope
D. current tracer
Show Answer
Scratch Pad
Discuss
Correct Answer: logic clip
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