Technician A says an uneven rumble or a grinding sound indicates possible wheel bearing problems. Technician B says wheel bearings should be checked for wear and looseness by grasping the top and bottom of the tire and trying to wobble the wheel and tire back and forth. Who is correct?
A. A only
B. B only
C. both A and B
D. neither A nor B
Ans: C. both A and B
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Which of the following statements about converting a system from one refrigerant to another is correct?
a. Synthetic and mineral oils are fully compatible. b. A new metering device may be required. c. Equipment capacity must remain exactly the same. d. HCFCs can only be replaced by another HCFC.
Which of the following issues qualifies as a risk communication topic?
a. When will a new consumer product be available in stores? b. Is it safe to eat beef? c. Will the company unveil its new logo this week? d. How much will a new product cost?
A signal showing the voltage of a battery displayed on a digital storage oscilloscope (DSO) is being discussed. Technician A says that the display will show one horizontal line above the zero line. Technician B says that the display will show a line sloping upward from zero to the battery voltage level. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
Hangers for fiberboard duct should be placed no further than every:
A) 5 ft. B) 12 ft. C) 6 ft. D) Fiberboard duct does not require hangers because it is self-supporting.