Which of the following statements regarding installation of a fireplace is correct?
A. Refractory mortars or portland cement mortar can be used to install the firebrick hearth.
B. Heat Stop 50 should be remixed or tempered if the mortar begins to dry out during the installation.
C. Mortar should be used to level the unit on the hearth.
D. The fireplace form should be centered on the hearth, even with the edge of the front course of firebrick.
Answer: D
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The ____ system is an information system with a telephony interface that can be used to automate the alert process.
A. DR plan desk system B. DR plan simulation C. auxiliary phone alert and reporting system D. damage assessment report
Los dispositivos protectores para motores incluyen todos los siguientes EXCEPTO:
a. fusibles. b. disyuntores de circuito. c. solenoides. d. relés de sobrecarga.
Answer the following statement(s) true (T) or false (F)
1.The NEC® requires that all fluorescent ballasts installed indoors, for both new and replacement applications, must have thermal protection built into the unit by the manufacturer. 2.Metal halide lamps do not require the use of a ballast. 3.Fluorescent, incandescent, and LED recessed lighting fixtures are available for use in homes. 4.Lighting fixtures in suspended ceilings are considered recessed fixtures. 5.A “damp location” lighting fixture may be installed in an area subject to saturation from water and other liquids.
When using the J and K inputs on a 74LS76 flip-flop, what is the propagation delay under test conditions of waveform 1?
A) 20 ns B) 40 ns C) 60 ns D) 15 ns