Mạch nhánh & Đi dâyCâu 234 / 521
If the one-way length of a circuit run is doubled while current and conductor size stay the same, what happens to the voltage drop?
a.It is halved
b.It doubles
c.It stays the same
d.It quadruples
Giải thích
Voltage drop is directly proportional to conductor length, so doubling the length doubles the voltage drop. It does not stay constant or quadruple, and it certainly does not decrease.
Luyện miễn phí toàn bộ 521 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A 240 V single-phase circuit uses 10 AWG copper (10,380 cmil) carrying 24 A over a one-way length of 150 ft, with K = 12.9. What is the approximate voltage drop and percentage?
- In the voltage-drop formula for a balanced 3-phase circuit, which multiplier replaces the factor of 2 used in single-phase calculations?
- To reduce voltage drop on a long branch-circuit run without changing the load, what is the most effective method?
- Per 200.6(A), a grounded (neutral) conductor 6 AWG or smaller must be identified by which of the following?
- Per 250.119, an equipment grounding conductor may be identified by which of the following?
- Per 110.15, on a 4-wire delta-connected 120/240 V system, the high-leg (the conductor with the higher voltage to ground) must be identified by what color?
Cập nhật gần nhất: · quy trình kiểm tra
Đội Ngũ Biên Tập PrepPass · Đối chiếu với California CSLB C-10 Electrical Trade Examination · Quy trình kiểm tra