What type of sensor is often used to by the PCM to determine SCR effectiveness?
A. Dosing sensor.
B. Oxide sensor.
C. Oxygen sensor.
D. SCR outlet temperature sensor.
Answer: C
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Which of the following hazards can cause the vessel to rupture?
A. Overpressurization B. Pulling a vacuum on a tank while emptying C. Putting wrong or off-spec material in a vessel D. Misalignment of pump systems
A permanent magnet is a piece of magnetic material that has been magnetized and can hold its magnetic strength for a reasonable length of time.
Answer the following statement true (T) or false (F)
For a return to zero data format ________
A) a single pulse during a bit time represents a 1 and absence of a pulse represents a 0 B) a single pulse during a bit time represents a 0 and absence of a pulse represents a 1 C) the format is meaningless because there is no return to zero data format D) a change during a bit time represents a 1 and no change represents a 0
Which of the following statements regarding chillers is TRUE?
A) Top-loaded chillers do not use shell-and-tube arrangements. B) Dry (direct expansion) chillers require less refrigerant than do flooded chillers. C) Regional zone chillers are more cost-effective than centralized units. D) Flooded chillers have less potential for freeze-ups than other chillers.