NYC DCAS ELECTRICIAN EXAM MASTER STUDY GUIDE PRACTICE QUESTIONS WITH ANSWERS BASED ON NEC 2017/2020 AND NYC AMENDMENTS QUESTIONS COMPLETE WITH VERIFIED ANSWERS

NYC DCAS ELECTRICIAN EXAM MASTER STUDY GUIDE PRACTICE QUESTIONS WITH ANSWERS BASED ON NEC 2017/2020 AND NYC AMENDMENTS QUESTIONS COMPLETE WITH VERIFIED ANSWERS 1. According to Ohm's Law, what is the current flowing through a 24-ohm resistor connected across a 120-volt source? A) 2 A B) 5 A C) 10 A D) 20 A Correct Answer: B Rationale: Ohm's Law states I = E/R. Therefore, I = 120V ÷ 24Ω = 5 amperes. This is a fundamental relationship required for all circuit analysis. ________________________________________ 2. What is the minimum size copper equipment grounding conductor required for a 100A feeder protected by a 100A breaker? A) #6 AWG B) #8 AWG C) #4 AWG D) #10 AWG Correct Answer: B Rationale: NEC Table 250.122 specifies that for a 100A overcurrent device, the copper equipment grounding conductor must be #8 AWG. #6 AWG is for 200A, and #10 AWG is for 60A. ________________________________________ 3. In a purely resistive AC circuit, what is the phase relationship between voltage and current? A) Current leads voltage by 90° B) Current lags voltage by 90° C) Current is in phase with voltage D) Current leads voltage by 180° Correct Answer: C Rationale: In a purely resistive circuit, there is no reactance to cause a phase shift, so voltage and current rise and fall together and are in phase. ________________________________________ 4. What is the minimum bending radius for rigid metal conduit (RMC) of trade size 1 inch when field bending? A) 4 inches B) 6 inches C) 8 inches D) 10 inches Correct Answer: B Rationale: NEC 344.24 requires the minimum bending radius for RMC to be 6 times the trade size. For 1-inch RMC: 1" × 6 = 6 inches. ________________________________________ 5. A 240V single-phase circuit supplies a 3600W electric water heater. What is the current draw? A) 10A B) 15A C) 20A D) 25A Correct Answer: B Rationale: Using the power formula P = V × I, rearrange to I = P ÷ V = 3600W ÷ 240V = 15 amperes. ________________________________________ 6. Which of the following is the minimum required working space depth in front of electrical equipment operating at 480V with exposed live parts on one side and grounded parts on the other side (Condition 1)? A) 2 feet 6 inches B) 3 feet C) 3 feet 6 inches D) 4 feet Correct Answer: B Rationale: NEC Table 110.26(A)(1) requires a minimum working space depth of 3 feet for Condition 1 (exposed live parts on one side and grounded parts on the other side) at voltages 151-600V. ________________________________________ 7. The maximum number of 12 AWG THHN conductors permitted in ½-inch EMT is: A) 9 B) 12 C) 13 D) 16 Correct Answer: A Rationale: NEC Chapter 9 Table 1 and Annex C Table C.1 specify that ½-inch EMT can hold a maximum of 9 #12 THHN conductors based on 40% fill requirements. ________________________________________ 8. What color is required for the equipment grounding conductor in a 120/240V system? A) White B) Gray C) Green D) Blue Correct Answer: C Rationale: NEC 200.6(A) requires white or gray for grounded neutral conductors. NEC 250.119 requires green, green with yellow stripe, or bare for equipment grounding conductors. ________________________________________ 9. A 120V branch circuit supplies a continuous load of 12A. The minimum conductor ampacity required is: