What is a practical use for knowing a substance's triple point?
A) Triple point is a purely theoretical concept that cannot be actually achieved
B) Calibrating thermometers using the triple point temperature
C) Understanding the practical operating limits of a refrigeration system
D) Understanding that a system may not be charged past the triple point of the refrigerant being used
B
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Very large air conditioning loads are normally handled by
A) Rooftop packaged air conditioners B) Vertical packaged air conditioners C) Packaged terminal air conditioners D) Chillers
Why should only oil designed for vacuum pump operation be used in vacuum pumps?
What will be an ideal response?
When AC is applied across a capacitor, a ____ phase shift exists between the circuit current and capacitor voltage.
A. 45° B. 60° C. 63.2° D. 90°
Metric twist drills are classified as preferred and ____________________.
Fill in the blank(s) with the appropriate word(s).