Damaging a metal surface raises stress, weakening the part. This is called a(n) "____________________."
Fill in the blank(s) with the appropriate word(s).
stress raiser
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On a cold day it is normal for the thermostat to stay closed for more than 15 minutes
Indicate whether the statement is true or false
NEC Article 240 covers which of the following?
a. Nontime-delay fuses b. Ampere rating c. Overcurrent protection d. Plug fuses
The wet coil static pressure drop is:
A) Lower than the dry coil static pressure drop. B) About the same as the dry coil static pressure drop. C) Can only be determined when the coil is submerged in water. D) Higher than the dry coil static pressure drop.
The air flow in a duct in a house should have a speed faster than 50 ft/ min so that it does not lose heat in the winter or gain heat in the summer before reaching the room. The dining room of a house is to have a flow of 150 cu ft/min to have proper air exchange. What should be the largest duct area going to this room?
Fill in the blank(s) with the appropriate word(s).