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100+ Free NM CID ES-2 Practice Questions

Prepare for the New Mexico CID ES-2 Cathodic Protection and Lightning Protection Systems Examination exam with instant access — no signup required.

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2026 Statistics

Key Facts: NM CID ES-2 Exam

75%

Passing Score

PSI NM Contractor Bulletin 4/3/2026

50 Q

Official Exam Questions

PSI NM Contractor Bulletin 4/3/2026

120 min

Time Allowed

PSI NM Contractor Bulletin 4/3/2026

USD 68.88

PSI Exam Fee

PSI NM Contractor Bulletin 4/3/2026

NM CID ES-2 is a 50-question PSI exam on cathodic and lightning protection, 75% pass, 120 minutes, USD 68.88 (bulletin 4/3/2026).

Sample NM CID ES-2 Practice Questions

Try these sample questions to test your NM CID ES-2 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A 24-ohm heating element is connected across a 120-volt source. What is the current?
A.0.2 ampere
B.2 amperes
C.5 amperes
D.20 amperes
Explanation: Ohm's law is I = E / R. Dividing 120 volts by 24 ohms gives 5 amperes. Current rises if resistance falls and falls if voltage falls, so always divide voltage by the actual circuit resistance.
2A conductor carrying 10 amperes has 2 ohms of resistance. How much heat power is produced in that conductor?
A.200 watts
B.20 watts
C.400 watts
D.2,000 watts
Explanation: Joule heating is P = I²R. Ten amperes squared is 100, times 2 ohms equals 200 watts. Lightning down conductors and cathodic-protection cables both heat by I²R, so oversized or loose connections run hot.
3In a series circuit, which quantity is the same through every component?
A.Current
B.Voltage drop
C.Power dissipation
D.Resistance
Explanation: Series components share one current path, so the same current flows through each device. Voltage divides in proportion to resistance, and power is I²R at each resistor, so those values differ unless the resistances are equal.
4Which identification is required for an equipment grounding conductor that is not bare?
A.Continuous green, or green with one or more yellow stripes
B.White or gray insulation only
C.Orange insulation on all voltages
D.Blue insulation on 120-volt circuits and red on 480-volt circuits
Explanation: NEC 250.119 requires a wire-type equipment grounding conductor to be bare, covered, or insulated and, if insulated or covered, to be green or green with one or more yellow stripes. White or gray is reserved for grounded (neutral) conductors under 200.6.
5What is the standard frequency of alternating-current utility power in the United States?
A.25 hertz
B.50 hertz
C.60 hertz
D.400 hertz
Explanation: U.S. electric utilities deliver 60 hertz alternating current. Rectifiers, motors, and transformers on an ES-2 job are therefore selected and nameplated for 60 hertz unless they are listed for another frequency.
6The peak value of a 120-volt RMS sine-wave voltage is closest to which of the following?
A.170 volts
B.85 volts
C.208 volts
D.240 volts
Explanation: For a sine wave, peak = RMS × √2. 120 × 1.414 is about 170 volts. Insulation, surge devices, and meter peak readings must be compared to this crest, not only to the 120-volt RMS nameplate.
7What is the primary electrical function of a rectifier used on an impressed-current cathodic-protection system?
A.Convert alternating current to direct current
B.Convert direct current to alternating current
C.Step voltage down without changing waveform
D.Correct power factor on the AC service
Explanation: A rectifier uses diodes or controlled semiconductors to change AC supply into DC output. Impressed-current cathodic protection requires DC so current can leave inert anodes, enter the electrolyte, and return on the protected structure.
8Which instrument is used to measure insulation resistance of a cable or winding, typically in megohms?
A.Megohmmeter (insulation tester)
B.Clamp-on ammeter
C.Power-factor meter
D.Phase-sequence indicator
Explanation: A megohmmeter applies a known DC test voltage and reads insulation resistance in megohms. Continuity testers and ohmmeters use too little voltage to stress insulation, and clamp meters measure load current, not insulation quality.
9A Class A ground-fault circuit interrupter is designed to trip when ground-fault current is in which range?
A.4 to 6 milliamperes
B.0.5 to 1 milliampere
C.15 to 20 milliamperes
D.30 to 50 milliamperes
Explanation: UL 943 Class A GFCIs trip when ground-fault current is in the 4 to 6 milliampere range, fast enough to reduce shock injury. They are personnel-protection devices, not equipment ground-fault protective devices set at much higher currents.
10Two 12-ohm resistors are connected in parallel. What is the equivalent resistance?
A.6 ohms
B.12 ohms
C.24 ohms
D.144 ohms
Explanation: Equal parallel resistors combine as R / N. Two 12-ohm resistors equal 6 ohms. The same result comes from (12 × 12) / (12 + 12) = 144 / 24 = 6 ohms. Parallel paths always lower the total resistance below the smallest branch.

About the NM CID ES-2 Exam

The New Mexico CID ES-2 examination covers cathodic protection and lightning protection systems. The official open-book PSI exam has 50 scored questions, a 75% passing standard (38 points), and 120 minutes allowed. Allowed references are NEC 2020, NFPA 780 (2004), and New Mexico Electrical Code NMAC 14.10.4 (2020). Pipeline corrosion handbooks, NACE texts, Ugly's, and the American Electricians' Handbook are not allowed. PSI lists the fee at USD 68.88 (bulletin updated 4/3/2026). This English-language MCQ bank is a study aid, not an official PSI form.

Questions

50 scored questions

Time Limit

120 minutes

Passing Score

75% (38 of 50 points)

Exam Fee

USD 68.88 (PSI Services LLC (for New Mexico Construction Industries Division))

NM CID ES-2 Exam Content Outline

30%

General Electrical Knowledge

General electrical knowledge (15 items)

30%

National Electrical Code

NEC application (15 items)

20%

Lightning Protection

NFPA 780 lightning protection (10 items)

20%

Cathodic Protection

Cathodic protection systems (10 items)

How to Pass the NM CID ES-2 Exam

What You Need to Know

  • Passing score: 75% (38 of 50 points)
  • Exam length: 50 questions
  • Time limit: 120 minutes
  • Exam fee: USD 68.88

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

NM CID ES-2 Study Tips from Top Performers

1Study NFPA 780-2004 air terminals, down conductors, and bonding together with NEC grounding
2This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the NM ES-2 exam?

The official PSI examination has 50 scored questions. Passing is 75% (38 points) within 120 minutes (bulletin updated 4/3/2026).