Exam Cheat Sheet · Quick Reference
Mississippi Marine Construction
Mississippi · PSI Services Contractor
Mississippi State Portion 40 questions
Key Distinctions
Isolation joints extend the full depth of the slab with a premolded filler to allow horizontal and vertical movement at junctions with walls, columns, and footings, while contraction joints extend only approximately one-quarter the concrete thickness to control cracking.
Design and Control of Concrete Mixtures, Page 282Flash set results from inadequate calcium sulfate to control C₃A hydration, causes rapid loss of workability with considerable heat, and cannot be reversed by further mixing without adding water; false set is caused by rapid crystallization of secondary gypsum when too much gypsum dehydrates to plaster during finish milling.
Design and Control of Concrete Mixtures, Page 134Ownership costs include major repairs and overhauls (investments that extend service life), while operating costs include fuel, lubricants, and tires consumed in day-to-day operation.
Construction Equipment Guide, Chapter 2, Page 80Leasing is treated as an operating expense (off-balance-sheet financing) that preserves bonding capacity, while direct ownership creates a debt liability that can reduce bonding capacity but provides tax depreciation shield and guaranteed control of mechanical condition.
Construction Equipment Guide, Chapter 2 - Equipment Economics, Lease considerationsType MV-90 has a maximum operating temperature of 90°C, while Type MV-105 has a maximum operating temperature of 105°C; both are suitable for dry or wet locations.
NEC Table 315.10(A)Shielded or lead-covered conductors must not be bent to a radius less than 12 times the overall diameter, while nonshielded conductors must not be bent to less than 8 times the overall diameter.
NEC 305.5Danger signs must have a red upper panel, black border outline, and white lower panel, and shall be used only where an immediate hazard exists; general warning signs do not carry these specific color and usage restrictions.
OSHA 1926 CFR 29, Page 201Type III is chemically similar to Type I but ground finer to achieve high early strength quickly; Type II(MH) is formulated to generate heat at a slower rate, limiting the heat index to a maximum of 100, making it suitable for mass concrete.
Design and Control of Concrete Mixtures, Page 113Type V is specifically designed for severe sulfate environments with a maximum C₃A content of 5%, while Type I is general purpose with no special sulfate resistance.
Design and Control of Concrete Mixtures, Page 113Fly ash generally reduces water demand in a concrete mix, whereas silica fume increases water demand.
Design and Control of Concrete Mixtures, Page 363OSHA defines a competent person as one who can identify existing and predictable hazards and has authorization to take prompt corrective measures; NEC defines a qualified person for MV cable work as one with documented training and experience in installation and testing of Type MV cable.
OSHA 1926 CFR 29, Page 31Direct-buried cables rated over 1000V AC through 22kV require a minimum cover of 750 mm (30 in.), while conductors over 22kV through 40kV installed in rigid metal conduit require only 150 mm (6 in.) of cover.
NEC Table 305.15(A)Key Terms
Formulas to Know
Panel length ÷ panel width ≤ 1.5 (panels with ratio > 1.5 are likely to crack near center of long dimension)Max aggregate size ≤ (1/3) × slab depthMax aggregate size ≤ (1/5) × narrowest dimension of vertical memberMax aggregate size ≤ (3/4) × clear spacing between reinforcing barsContraction joint depth ≈ (1/4) × slab thicknessOptimum life = point where (Cumulative Ownership Cost/hr + Cumulative Operating Cost/hr) is minimizedEmployees ≤ 20 → minimum 1 toilet facility required on site1 extinguisher (rated ≥ 2A) per 3,000 sq ft of protected building area