What is an open delta system?
What will be an ideal response?
An open delta system is any 3-phase delta electrical system that is operated with only two transformers.
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Which of the following occupancies has the highest floor live load?
A) Classrooms B) Offices C) Hotel guest rooms D) Library stack rooms E) Library reading rooms
One method of making a single-phase motor self-starting is to apply the ____ principle.
A. phase-splitting B. current-splitting C. voltage-splitting D. resistance-splitting
In a 60-cycle alternating electromotive force (emf), the angular velocity is 21,600° per second. What is the instantaneous voltage (e) at the end of exactly 0.04 seconds? The maximum voltage (Emax) is 580.0 volts. Round the answer to the nearest tenth volt.
Fill in the blank(s) with the appropriate word(s).
Concrete-surface imperfections caused by trapped bubbles of air or water are referred to as _____
a. voids b. bug holes c. lapses d. pockmarks