Nyc Electrician (Nyc Health + Hospitals – Nyc H+H) Verified Exam Questions And Answers - Latest Version

NYC ELECTRICIAN (NYC HEALTH + HOSPITALS – NYC H+H) VERIFIED
EXAM QUESTIONS AND ANSWERS - LATEST VERSION




NYC Electrician (NYC Health + Hospitals – NYC H+H)




Q1. What is the unit of measurement for electrical resistance?
ANSWER Ohms (Ω)
Q2. What is the unit of measurement for electrical current?
ANSWER Amperes (A)
Q3. What is the unit of measurement for electromotive force (EMF)?
ANSWER Volts (V)
Q4. What is the unit of measurement for electrical power?
ANSWER Watts (W)
Q5. What is the unit of measurement for electrical energy consumed
over time?
ANSWER Watt-hours (Wh) or kilowatt-hours (kWh)
Q6. According to Ohm's Law, what is the formula for current?
ANSWER I = V ÷ R (Current equals Voltage divided by Resistance)
Q7. According to Ohm's Law, what is the formula for resistance?
ANSWER R = V ÷ I (Resistance equals Voltage divided by Current)
Q8. According to Ohm's Law, what is the formula for voltage?
ANSWER V = I × R (Voltage equals Current times Resistance)
Q9. What is the formula for electrical power in a DC circuit?
ANSWER P = V × I (Power equals Voltage times Current)

,Q10. What is the formula for power when resistance and current are
known?
ANSWER P = I² × R
Q11. In a series circuit, how is total resistance calculated?
ANSWER R_total = R1 + R2 + R3 + ... (sum of all resistances)
Q12. In a parallel circuit, how is total resistance calculated for two
resistors?
ANSWER R_total = (R1 × R2) ÷ (R1 + R2)
Q13. What happens to total resistance when resistors are added in
parallel?
ANSWER Total resistance decreases and becomes less than the
smallest individual resistor.
Q14. What is the relationship between voltage drops in a series circuit?
ANSWER The sum of all voltage drops equals the applied voltage
(Kirchhoff's Voltage Law).
Q15. What is Kirchhoff's Current Law?
ANSWER The total current entering a junction equals the total current
leaving the junction.
Q16. What is the standard frequency of AC power in the United States?
ANSWER 60 Hertz (Hz)
Q17. What does one complete cycle of AC consist of?
ANSWER Two alternations: one positive and one negative.
Q18. What is the peak voltage of a 120V RMS AC sine wave?
ANSWER Approximately 170V (120V × 1.414)
Q19. What is the RMS value of a sine wave?
ANSWER The effective value that produces the same heating effect as
an equivalent DC voltage.
Q20. What is the phase relationship between voltage and current in a
purely resistive AC circuit?

,ANSWER They are in phase (0° phase difference).
Q21. What is the phase relationship between voltage and current in a
purely inductive AC circuit?
ANSWER Current lags voltage by 90°.
Q22. What is the phase relationship between voltage and current in a
purely capacitive AC circuit?
ANSWER Current leads voltage by 90°.
Q23. What is inductive reactance measured in?
ANSWER Ohms (Ω)
Q24. What is the formula for inductive reactance (X_L)?
ANSWER X_L = 2πfL
Q25. What is capacitive reactance measured in?
ANSWER Ohms (Ω)
Q26. What is the formula for capacitive reactance (X_C)?
ANSWER X_C = 1 ÷ (2πfC)
Q27. What is impedance (Z) in an AC circuit?
ANSWER The total opposition to current flow, combining resistance
and reactance.
Q28. What is the power factor of a purely resistive circuit?
ANSWER Unity (1.0)
Q29. What does a low power factor indicate?
ANSWER A large reactive component, causing inefficiency and higher
current for the same real power.
Q30. What is apparent power measured in?
ANSWER Volt-amperes (VA)
Q31. What is real power measured in?
ANSWER Watts (W)
Q32. What is reactive power measured in?

, ANSWER Volt-amperes reactive (VAR)
Q33. What is the formula for power factor?
ANSWER PF = Real Power (W) ÷ Apparent Power (VA)
Q34. What is a transformer and what does it do?
ANSWER A static electromagnetic device that transfers electrical
energy between circuits through mutual induction, typically changing
voltage levels.
Q35. What is the turns ratio of a transformer?
ANSWER The ratio of primary turns to secondary turns (N_p ÷ N_s),
which equals the voltage ratio.
Q36. In a step-down transformer, which winding has more turns?
ANSWER The primary winding.
Q37. What is eddy current loss in a transformer?
ANSWER Energy loss caused by circulating currents induced in the
iron core, minimized by laminating the core.
Q38. What is hysteresis loss?
ANSWER Energy loss in a magnetic core due to the reversal of
magnetization as the AC cycles.
Q39. What is the purpose of a capacitor in an AC circuit?
ANSWER To store electrical energy in an electric field, improve power
factor, or block DC while passing AC.
Q40. What is the time constant of an RC circuit?
ANSWER τ (tau) = R × C (Resistance times Capacitance)
SECTION 2: AC/DC CIRCUITS & MACHINERY (Q41–Q80)
Q41. What is the standard line-to-line voltage of three-phase power in
NYC commercial buildings?
ANSWER 208V (120V line-to-neutral)
Q42. What is the standard line-to-line voltage of three-phase power in
industrial settings?