Why is inches of water column used to measure duct pressure instead of psig?
What will be an ideal response?
Psig is a larger scale and the small duct pressures would not register accurately. Therefore, a much smaller scale (inches of water column) is used.
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Cutting of concrete block should be kept to a minimum.
Answer the following statement true (T) or false (F)
What are the major areas of emphasis in Subpart K?
A. Safety requirements for installation. B. Safety-related work practices. C. Safety-related maintenance and environmental considerations. D. Safety requirements for special equipment. E. All of the above
When using inert gas to displace oxygen from a container prior to cutting, provide a _____
a. relief valve b. weephole c. drain plug d. vent hole
An RC high-pass filter consists of a 0.15 ?F capacitor and an RF of 870 ?. An RL of 9 k? is placed across the RF output resistor. The circuit's cutoff frequency is
A) 131 Hz B) 1.33 kHz C) 665 Hz D) 1.34 kHz