What makes gypsum board an excellent material for providing fire protection?
What will be an ideal response?
It is noncombustible. More importantly, each 100 lb of gypsum contains about 21 lb of water. In the event of fire, water must convert to steam before fire can disintegrate gypsum board. Until all water in gypsum board has evaporated, its temperature remains low as it cannot exceed 212°F?the boiling point of water.
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Adhesive on flexible foam insulation should be applied _____.
a. as a 1?8" (3 mm) bead b. on one surface only c. only above 50°F (10°C). d. as a thin layer on both surfaces
An instrument called a clamp-on ammeter is so called because the tongs can be clamped around a single wire.
Answer the following statement true (T) or false (F)
Answer the following statement(s) true (T) or false (F)
1. Contacts can be permitted to slowly close or open. 2. A diaphragm switch can be used to sense a much higher pressure than a metal bellows type switch. 3. The pressure switch contains both normally open and normally closed contacts. 4. In order for the control circuit to perform its desired function, the pressure switch must contain six different contacts, three normally closed and three normally open. 5. The force sensor is unable to use silicon piezoresistive elements to determine the amount of pressure to the sensing element.
List four causes of exterior door handle problems.
What will be an ideal response?