A compressor pump down is performed in order to change the compressor oil. With the unit operating in high speed cool:
A. Front seat the receiver tank outlet valve
B. Front seat the suction service valve
C. Front seat the discharge service valve
D. Front seat the bypass check valve
Answer: B
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Which of the following is true of tungsten contamination?
A. Tungsten contamination causes a weak weld and must be cleaned. B. Tungsten particles will not show up, even if the weld is x-rayed. C. Tungsten contamination is rare and easily controlled. D. Tungsten particles in the weld will have no effect on the weld.
If the emission levels on a 4-gas analyzer indicate that both CO and HC are high and both O2 and CO2 are low, what could this indicate?
A. a rich mixture B. a lean mixture C. the stoichiometric mixture D. none of the above
The __________ encoder system does not lose its position data if power is lost.
A. incremental B. absolute
When you are installing a prehung door, what should be done with the factory-installed spacer shims between
the door and the frame? a. Leave them in place permanently. b. Remove them after the door is attached to the rough opening. c. Remove them before you start the installation. d. Remove them when the door is in place, but before you attach it to the rough opening.