When is the only time that both hand valves of a manifold gauge set should be open at the same time?
a.when reading both pressures
b.during system evacuation
c.never open both at the same time
d.during system charging
b.during system evacuation
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The listed ampacities in the Code tables assume that the length of the conductor will not significantly increase the ____ of the circuit.
A. ampacity B. resistance C. capacitance D. inductance
The ____________________ shows the circuit wiring and its associated devices in their relative physical location.
Fill in the blank(s) with the appropriate word(s).
Most concrete masonry units (CMUs) are called ____, which have the familiar shape of a CMU.
a.corner blocks b.sash blocks c.extenders d.stretchers
Technician A says that PAFC fuel cells can use hydrogen as fuel. Technician B says that PEM fuel cells can use hydrogen as fuel. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician