Technician A says a defective radiator cap vacuum valve may cause hoses to collapse. Technician B says a defective pressure valve may cause coolant boil over and loss. Who is correct?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
Answer: C
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Repeat Problem 19-14 with the subgrade Mr values for each month from January through December being 18,000, 18,000, 12,000, 8000, 8000, 9000, 9000, 9000, 9500, 9500, 12,000, and 20,000 lb/in2, respectively. The pavement structure will be exposed to moisture levels approaching saturation for 20% of the time, and it will take about 4 weeks for drainage of water from the pavement. Use untreated sandy gravel with Mr of 15 × 103 lbs/in2 for subbase and untreated granular material with Mr of 28 × 103 lbs/in2 for the base course.
What will be an ideal response?
Technician A says brake pedal freeplay may be as little as 1/8 inch. Technician B says brake pedal freeplay allows the master cylinder pistons to fully retract. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
For both PNP and NPN transistors, moving the base voltage toward the collector voltage supply turns the transistor on
Indicate whether the statement is true or false
The coil power supply for most relays used in HVAC control circuits is _____
a. 24VAC b. 24VDC c. 120VAC d. 240VAC