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2-17. For which of the following reasons
would you classify an IC as a "black
box" device?
1. Because ICs are always black in color
2. Because all you can check are the
inputs and outputs, not the internal
operation of ICs
3. Because printed circuit boards that
contain ICs cannot be repaired
4. Because ICs are designed to be
repairable components
2-18. Test equipment used to detect the logic
state of a digital IC should have which of
the following characteristics?
1. A capability of measuring rms
voltages
2. A frequency response in excess of 40
GHz
3. A high input impedance
4. A low input impedance
2-19. Which of the following statements
describes) the use of logic clips?
1. Logic clips are designed to monitor
the input and output of an IC
simultaneously
2. Logic clips can only be used to test an
IC that is out of the circuit
3. Logic clips can only be used with flat
pack ICs
4. All of the above
2-20. For which of the following purposes are
logic comparators used?
1. To test linear ICs
2. To compare different types of ICs
3. To inject pulse trains into digital ICs
4. For in-circuit testing of digital ICs by
comparing them with reference ICs
2-21. Which of the following is an advantage
of using a logic probe instead of an
oscilloscope to test a digital IC?
1. Logic probes are usually larger than
an oscilloscope but much lighter
2. Logic probes have a low input
impedance
3. Logic probes are battery powered and
do not react to line voltage variations
4. Logic probes are capable of detecting
short-duration pulses that most
oscilloscopes cannot display
2-22. For which of the following purposes are
logic pulsers used?
1. To detect the logic state of digital ICs
2. To detect the logic state of linear ICs
3. To inject a pulse or pulse train into a
logic circuit
4. To inject a 1-kHz sine wave into a
circuit for signal tracing
2-23. Which of the following is a typical
application for a logic analyzer?
1. To program EPROMs
2. To test individual logic ICs
3. To analyze the spectral purity at the
output of a logic IC
4. To perform timing analysis by
monitoring and comparing more than
one timing signal simultaneously
