Licensing Exam Prep Study Guide | Updated Questions & Answers |
NEC-Based Review | 100% Verified Solutions for Journeyman
Certification Success
A 240v, 24a, Single-Phase Load Is Located 160 Ft From The Panelboard. The Load Is Wired With
10 Awg Conductors. What's The Approximate Voltage Drop Of The Branch-Circuit Conductors?
A. 3.2v
B. 4.25v
C. 5.9v
D. 9.5v
ANS: D. 9.5v
Vd = (2 X K X I X D)/Cmil
K = 12.90, Copper
I = 24a
D = 160 Ft
Cmil = 10,380
Vd = (2 Wires X 12.90 X 24a X 160 Ft)/10,380 Cmil
Vd = 9.50v
During Normal Operation Of A Typical 120-Volt Appliance Circuit, Current Flows Through The
Hot, Grounding, And Neutral Conductors.
A. True
B. False
, ANS: B. False
An Rlc Series Circuit Has An Applied Voltage Of 240 Volts. R = 48 Ω, Xl = 100 Ω, Xc = 36 Ω, And Z
= 80 Ω. What Is The Total Current?
A. 1 A
B. 2 A
C. 3 A
D. 4 A
ANS: C. 3 A
240/80 = 3
What's The Direct-Current Resistance Of A 6 Awg Copper Conductor That's 400 Ft Long?
A. 0.20 Ohms
B. 0.30 Ohms
C. 0.40 Ohms
D. 0.50 Ohms
ANS: A. 0.20 Ohms
6 Awg Resistance = 0.491 Ohms/1,000 Ft [Chapter 9, Table 8]
(0.491 Ohms/1,000 Ft) X 400 Ft = 0.1964 Ohms