CalculationsPregunta 22 de 110
Using the previous circuit (5.06-V drop on a 120-V circuit), what is the approximate percent voltage drop?
a.2.1%
b.4.2%
c.6.0%
d.3.0%
Explicación
Percent VD = 5.06 / 120 = 0.042 = 4.2%, which exceeds the 3% recommended for branch circuits.
Practica las 110 preguntas gratis — sin registro.
Preguntas relacionadas de este tema
- What is the full-load secondary current of a 75-kVA, three-phase transformer with a 208-V secondary?
- A 75-kVA transformer has a 90-A primary current (over 9 A). With primary-only protection at 125% max, what is the primary overcurrent device rating (next higher standard permitted)?
- A 120-V branch circuit carries 16 A over a one-way run of 80 ft using #12 Cu (circular mils = 6,530, K = 12.9). What is the approximate voltage drop?
- A 208-V three-phase feeder carries 40 A over 150 ft using #6 Cu (CM = 26,240, K = 12.9). What is the approximate voltage drop?
- For a 112.5-kVA, 208-V, three-phase transformer with 2% impedance, what is the approximate available fault current at the secondary terminals (infinite primary)?
- A 45-kVA, 208-V, three-phase transformer has 2% impedance. What is the approximate available fault current at its secondary (infinite primary)?
Última revisión: · proceso editorial
Equipo Editorial de PrepPass · Verificado con Master Electrician Licensing Exam (NEC-based) · Cómo revisamos