Velocity pressure readings are taken on a duct system by:
A) Pointing the pressure-sensing tube perpendicular to the air stream.
B) Pointing the pressure-sensing tube into the airstream.
C) Subtracting the static pressure from the total pressure.
D) Subtracting the total pressure from the static pressure.
C
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Any vertex not having three edges connected to it means a(n) ____________________ is missing.
Fill in the blank(s) with the appropriate word(s).
The means of bonding to wire mesh or conductive elements in agricultural buildings shall be by ____ or clamps of brass, copper, copper alloy, or an equally substantial approved means.
A. pressure connectors B. standard solders C. copper-based welds D. aluminum welds
How much current flows through the alternator brushes?
A) All of the alternator output flows through the brushes B) 10 to 15 A C) 25 to 35 A, depending on the vehicle D) 2-5
?Which is a benefit of a closed-loop drainback system?
A. ?Its components last longer because they must be made of non-corroding materials. B. ?It can be connected directly to a space heating distribution system. C. ?It can be operated at a slight negative pressure. D. ?It does not need to accommodate the thermal expansion of system water.