Skip to main content

System voltage

In this diagram, if the first load is a 120V computer, what is the second load shown?
A. single phase transformer, 480/120-240V
B. 208V 3-phase motor
C. 208V heater, single phase
D. 277V discharge fluorescent lighting

AnswerC. 208V heater, single phase. Neutral to any single panel bus = 120V. A load connecting two panel buses (not neutral) is 208V single phase; between three panel buses is 208V 3-phase. Since the computer is 120V, system voltage cannot be 277/480.
ARE 4.0 exam prep: BS

Comments

Post a Comment

Try These Too!

Building Efficiency

Convert the usable area of classrooms planned with medium efficiency level of new construction to the gross building area given the following model factors: Net Assignable Square Feet: 10,000, Space Factor: 1.5, Building Efficiency Ratio: 67%
6 comments
See the answer »

Deflection: steel or wood

For EITHER steel or wood beams, a question that asks for the allowable deflection limit (maximum) for live loads only requires which of the following equations? A. L/240 B. L/360 C. ∆ = 5wl⁴ / 384EI D. ∆ = 5Wl³ / 384EI Answer B. L/360 or span in inches divided by 360. ARE 4.0 exam prep: SS Note on calculations: From posted discussions on AREforum , memorization of most equations is not advised. However, even when the equation may be available in in-exam reference, selection of the appropriate equation requires correct identification.
Post a Comment
See the answer »

Roof pitch

Which one of the following slopes in this illustration corresponds with an 8:12 pitch roof? A. 45° B. 36.87° C. 33.69° D. 26.57°
Post a Comment
See the answer »