Match each tool with its purpose.
A. measures very small pressures that are expressed in IWC
B. measures the air pressure in a duct system
C. measures air volumes at registers and grills
D. measures the speed of an airstream in a duct system
E. measures circuit currents
A. u-tube manometer
B. pitot tube
C. flow hood
D. velometer
E. ammeter
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Most control transformers are _____.
a. askarel-insulated step-up b. dry-type step-down c. liquid-insulated step-up d. oil-insulated step-down
If two 10-ohm resistors are connected in series, what is the total resistance of these resistors?
a. 100 ohms b. 20 ohms c. 5 ohms d. 1 ohm
A water-resistant barrier must be installed under standing-seam metal roofs because such roofs are subject to _____.
a. leakage b. condensation c. seam failure d. evaporation
In setting angles, the top plate of the sine plate is the ____________________ of a right triangle, and the gage blocks are the opposite side in reference to the desired angle.
Fill in the blank(s) with the appropriate word(s).