A(n) ____ is a horizontal intersection between two or more roof planes and represents the highest point of a roof.
A. ridge
B. eave
C. valley
D. cornice
Answer: A
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Un tubo principal o colector es _____.
a. una tubería que se conecta directamente a un intercambiador de calor b. una tubería que se conecta directamente a artefactos de plomería c. un bucle de tubería en un sistema de vapor que se utiliza para absorber la expansión d. una tubería de distribu- ción que va desde la fuente a los tubos de salida y no se conecta a ningún artefacto
Answer the following statement(s) true (T) or false (F)
1. Nonconductive optical fiber cables can be run in the same raceway or cable tray as Class 1 circuits. 2. Plastic optical fibers are a preferred choice in extreme temperatures. 3. Light travels in the form of an electromagnetic wave. 4. There is a difference between the index of refraction between the core and cladding of an optical fiber cable . 5. Loose-tube cable is more commonly used inside a building.
Which following start capacitors will replace one rated at 145–174 µF x 240 VAC?
a. 160-191 µF x 300 VAC b. 145-174 µF x 440 VAC c. 131-157 µF x 240 VAC
The ____ is the oldest optoelectric device. It is a light-sensitive device in which the internal resistance changes with a change in light intensity.
A. photodiode B. solar cell C. photo cell D. light-emitting diode