How are slate tile roofs built?
What will be an ideal response?
Slate tile is usually applied over solid sheathing covered with an asphalt-saturated roofing felt underlayment. Codes require double underlayment for roofs with less than 4:12 slopes. The material is fastened with large-head copper nails, with each course of slate covering the joints in the course below it. Plastic cement is applied over joints to be covered. Each slate must have at least two fasteners. Slates are laid in the same manner as other shingles. The exposed ends may be in even rows or laid in a random edge. Hips and ridges cannot be nailed and are held in place with a waterproof elastic slater's cement that is colored to match the slate.
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The most likely application of a contactor is a _____.
a. reversing motor starter with external overload protection b. squirrel cage, three-phase motor with no overload protection c. single-phase capacitor-start motor with no overload protection d. compound wound DC motor
El calor generado por los aparatos de iluminación presenta normalmente más peligro potencial de fuego si los aparatos de iluminación son:
a. montados en superficie. b. empotrados. c. suspendidos. d. montados en riel.
The subsequent problems deal with the circuit below where all voltage sources are dc and the circuit is assumed to be in steady state. Also, R1 = R2 = R3 = R4 = R.
The voltage across R2 is
A. 2V1 B. V1 / 2 C. V1 D. V1 / 3 E. 2V1 / 3
What are the main parts of the clutch assembly?
What will be an ideal response?