Describe how a capacitance discharge sensor that produces a digital frequency output can be diagnosed.
What will be an ideal response?
A voltmeter can be used to check the 5-volt reference and the ground circuits. However, to test the signal circuit of this type of sensor requires the use of a sensor tester that changes the sensor varying frequency to a voltage reading or a scan tool that performs this function. Also, a DMM that has a frequency measurement function can be used along with a vacuum hand pump. In addition, a lab scope can be used to monitor frequency changes as the exposed pressures change.
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Under what circumstances would you use a compound light microscope?
What will be an ideal response?
When a warning ribbon is required to mark the location of buried underground service conductors, it must be placed at least __________ inches above the buried conductors.
a. 8 b. 12 c. 18 d. 24
The over current protection for an electric furnace should be
A) At least as large as the maximum over current protection listed on the unit data plate B) No larger than the minimum circuit ampacity rating used to size the wire C) No larger than the maximum over current protection listed on the unit data plate D) The same size as the minimum circuit ampacity rating for the wire
Which of the following is a task that can be accomplished within the terminal box by a technician?
A) disconnecting service B) installation C) troubleshooting D) all of the above