When troubleshooting an oil furnace, the technician notices that the oil burner fires and burns normally for 90 seconds, and then shuts down. What is the most likely problem?
A. defective limit switch
B. defective oil burner fan motor
C. defective room thermostat
D. defective cad cell
Answer: D
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What are the three major uniform tire quality grading system ratings?
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Titanium becomes sensitive to embrittlement by oxygen, nitrogen, and hydrogen at temperatures above _____
a. 500°F (260°C) b. 1,000°F (538°C) c. 6,000°F (3,316°C) d. 10,000°F (5,538°C)
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Which timing control component gives an oscillator better stability and accuracy than the RC network?
A) comparator B) quartz crystal C) Schottky diode D) potentiometer
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Draw the top, the front, and the right side orthographic views of the objects shown. Indicate when an object needs only one or two views to be fully described.
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