LATEST CSLB B LICENSE GENERAL CONTRACTOR STUDY GUIDE EXAM WITH SOLUTIONS At an excavation, an Underground Service Alert (U.S.A) marking on the dirt that uses red paint or chalk means: - answer-Electric power How many diameters is the minimum lap (overlap) between sections of rebar in reinforced masonry? A. 7 B. 12 C. 24 D. 30 - answer-30 diameters If unused mortar stiffens due to hydration of cement, what must you do? - answer-Discard the mortarWhat minimum time must you wait before caulking or grouting new tiles? - answer-24-48 Hours How long should you wait before installing tile on a shower pan? - answer-24 Hours Unstable dry rock, angular gravel, sandy loam, and cohesive soils having compressive strengths greater than 0.5 and less than 1.5 tons/sq ft (tsf), are typical examples of: - answer-Type-B Soils If 65 street lights are fed by a 2275 volt series circuit, what is the voltage across each light? - answer-35V In a series circuit, the total voltage is divided equally. For safety reasons, the maximum simple slope of an excavation, up to 20 ft deep, in Type-B soil is: - answer-1:1 (45)A Pittsburgh joint is used in: - answer-HVAC ductwork The drain for a