Download MI Sign Specialist Exam Questions and Answers and more Exams Technology in PDF only on Docsity!
Question 1. According to Ohm’s Law, what is the formula for calculating current in a circuit? A) I = V/R B) I = R/V C) I = V × R D) I = P/V Answer: A Explanation: Ohm’s Law states that current (I) equals voltage (V) divided by resistance (R). Question 2. In an AC circuit, what is the unit of frequency? A) Watt B) Ohm C) Hertz D) Volt Answer: C Explanation: Frequency in alternating current (AC) circuits is measured in Hertz (Hz), representing cycles per second.
Question 3. What is the total resistance of two 10-ohm resistors connected in series? A) 5 ohms B) 10 ohms C) 20 ohms D) 100 ohms Answer: C Explanation: In series, resistances add directly, so 10 + 10 = 20 ohms. Question 4. What is the main purpose of a circuit breaker? A) To increase voltage B) To provide lighting C) To protect against overcurrent D) To measure resistance Answer: C Explanation: Circuit breakers interrupt current flow when excessive current is detected, preventing damage and fire.
Explanation: NEC Article 600.5(C)(2) requires sign branch circuit conductors to have a minimum ampacity of 18 amps. Question 7. Which of the following is NOT a type of electrical circuit? A) Series B) Parallel C) Combination D) Transverse Answer: D Explanation: Series, parallel, and combination are circuit types; transverse is not a type of electrical circuit. Question 8. What is the standard voltage for most commercial sign circuits in the United States? A) 48 volts B) 120 volts C) 480 volts
D) 9 volts Answer: B Explanation: Most commercial sign circuits operate at 120 volts. Question 9. Michigan’s adoption of the NEC is outlined in which set of rules? A) Part 4 B) Part 7 C) Part 8 D) Part 9 Answer: C Explanation: Michigan Electrical Code Rules (Part 8) govern the state’s adoption of the NEC. Question 10. Which law covers electrical licensing requirements in Michigan? A) PA 217 of 1956 B) PA 400 of 1978
B) Static current C) Alternating current D) Parallel current Answer: C Explanation: Alternating current (AC) changes direction periodically. Question 13. When calculating load for a sign circuit, which value must NOT be exceeded? A) 80% of circuit rating B) 100% of circuit rating C) 50% of circuit rating D) 120% of circuit rating Answer: A Explanation: Continuous loads should not exceed 80% of the circuit’s ampacity per NEC guidelines.
Question 14. What is the result when two 10-ohm resistors are connected in parallel? A) 20 ohms B) 5 ohms C) 10 ohms D) 2 ohms Answer: B Explanation: For parallel resistors: 1/Rt = 1/R1 + 1/R2; thus, Rt = 5 ohms. Question 15. What is required for all electrical signs according to NEC 600.6? A) Overhead ground wire B) A disconnecting means C) Solar panel backup D) Double insulation Answer: B Explanation: NEC 600.6 requires a disconnecting means within sight of the sign.
Question 18. Which instrument measures electrical resistance? A) Ammeter B) Voltmeter C) Ohmmeter D) Wattmeter Answer: C Explanation: An ohmmeter measures resistance. Question 19. According to NEC Chapter 3, what must be provided at all junction boxes? A) Labels B) Covers C) Circuit breakers D) Switches Answer: B
Explanation: All junction boxes must have covers to prevent accidental contact and protect wiring. Question 20. What is the definition of “branch circuit” per the NEC? A) Main feeder into building B) Portion of a circuit between the last overcurrent device and the load C) Any circuit over 100 amps D) Grounding conductor Answer: B Explanation: A branch circuit runs from the final overcurrent protection device to the load(s). Question 21. What is the minimum working space required in front of electrical equipment rated 600 volts or less, per NEC? A) 18 inches B) 24 inches C) 36 inches
C) Resistance value D) Power dissipation Answer: B Explanation: Ampacity is the maximum current a conductor can safely carry. Question 24. Which of the following is used to reduce voltage in a sign circuit? A) Diode B) Transformer C) Resistor D) Capacitor Answer: B Explanation: Transformers step voltage up or down as needed for the application. Question 25. What is the primary hazard of undersized conductors? A) Increased voltage B) Overheating and fire risk
C) Reduced power D) Electric shock Answer: B Explanation: Undersized conductors can overheat and potentially cause fires. Question 26. Which NEC article covers lighting fixtures (luminaires)? A) Article 410 B) Article 600 C) Article 220 D) Article 320 Answer: A Explanation: Article 410 covers lighting fixtures, not Article 600, which is for signs. Question 27. What is the required minimum height for overhead sign conductors above public streets? A) 8 feet
A) Ground Fault Circuit Interrupter B) General Fuse Circuit Indicator C) Grounded Fuse Control Indicator D) General Fault Control Instrument Answer: A Explanation: GFCI stands for Ground Fault Circuit Interrupter, a protective device. Question 30. What is the primary function of a sign transformer? A) Change current type B) Change voltage C) Change frequency D) Store energy Answer: B Explanation: A sign transformer is used to step voltage up or down for proper sign operation.
Question 31. According to NEC 600.5, what type of outlet must be provided for sign installations in commercial buildings? A) GFCI-protected B) Twist-lock C) Weatherproof D) Dedicated Answer: D Explanation: NEC 600.5(A) requires a dedicated outlet for each sign. Question 32. Which law states that the total power in a circuit equals voltage times current? A) Ohm’s Law B) Watt’s Law C) Kirchhoff’s Law D) Faraday’s Law Answer: B Explanation: Watt’s Law states P = V × I.
Question 35. What is the role of the Electrical Administrative Act (PA 217 of 1956) in Michigan? A) Outlines sign design standards B) Sets licensing and scope of work for electricians C) Defines electrical product safety D) Sets municipal tax rates Answer: B Explanation: The Act regulates licensing and work scope for electrical trades, including sign specialists. Question 36. What must be provided for all outdoor sign installations to prevent water ingress? A) Flexible conduit B) Weatherproof enclosures C) Grounding rod D) Insulated tape Answer: B
Explanation: Weatherproof enclosures protect wiring and components from weather. Question 37. Which part of the NEC contains definitions for key electrical terms? A) Article 100 B) Article 200 C) Article 600 D) Article 310 Answer: A Explanation: Article 100 of the NEC provides definitions for critical terms. Question 38. What is the purpose of a fuse in an electrical circuit? A) Increase voltage B) Measure current C) Protect against overcurrent D) Store energy
