When constructing which type of foundation system must a builder find the air-freezing index from IRC Table R403.3(2)?
A) Stepped foundation system B) ICF foundation system
C) Frost-protected shallow foundation system D) Monolithic foundation system
C
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When circuit breakers are installed in Class I locations, they must be ____.
A. dustproof B. dust-ignitionproof C. explosionproof D. waterproof
Which switching device uses LEDs?
A) Magnetic reluctor B) Optical sensor C) Hall effect D) Pickup coil
Failure to properly ground the ignition module on a gas furnace may result in _____
a. flame sensor burnout b. high igniter current c. failure of the flame sensor to function d. excessive flame rectification
Which of the following flip-flop timing parameters indicates the time it takes a Q output to respond to an input?
A) tw(1), tw(h) B) fmax C) tphl, tplh D) ts, th