Download PrepIQ Florida County Elevator Electrical Ultimate Exam and more Exams Technology in PDF only on Docsity!
Ultimate Exam
Question 1. Which Florida Building Code chapter specifically governs elevators and conveying systems? A) Chapter 24 B) Chapter 30 C) Chapter 33 D) Chapter 40 Answer: B Explanation: FBC Chapter 30 contains the requirements for elevators, escalators, and other conveying systems in Florida. Question 2. When applying for an electrical permit for elevator work in Florida, the applicant must submit which of the following to the local building department? A) Only a wiring diagram B) A completed permit application, elevator load calculations, and a copy of the contractor’s license C) A fire alarm plan D) No documentation is required for electrical permits Answer: B Explanation: The permit process requires the application, load calculations, and proof of proper licensing. Question 3. Under ASME A17.1, what is the minimum illumination level required in the machine room for normal operation? A) 5 foot-candles B) 10 foot-candles C) 20 foot-candles D) 30 foot-candles Answer: B Explanation: A17.1 mandates at least 10 foot-candles (approximately 108 lux) in the machine room for safe maintenance and operation.
Ultimate Exam
Question 4. Which device is mandated by ASME A17.1 to prevent elevator operation when phase reversal occurs? A) Ground fault circuit interrupter (GFCI) B) Phase-loss relay C) Phase-reversal protection relay (PRPR) D) Thermal overload relay Answer: C Explanation: A phase-reversal protection relay detects reversed phase sequence and disables the motor to avoid damage. Question 5. NEC 620.91 requires emergency communication equipment in the car. Which of the following satisfies this requirement? A) One-way intercom B) Two-way voice communication system C) Visual alarm only D) Flashing light panel Answer: B Explanation: NEC 620.91 specifies a two-way voice communication system between the car and a supervisory location. Question 6. According to NEC Article 620, what is the demand factor applied to the first 5 kW of elevator motor load when sizing the feeder? A) 100 % B) 80 % C) 55 % D) 40 % Answer: C Explanation: NEC 620.12 allows a 55 % demand factor for the first 5 kW of motor load.
Ultimate Exam
Question 10. When derating conductors for more than three current-carrying conductors in a raceway, what correction factor is applied for four conductors at 30 °C ambient? A) 100 % B) 80 % C) 70 % D) 55 % Answer: B Explanation: NEC Table 310.15(B)(3)(a) gives an 80 % factor for four conductors. Question 11. Which motor type typically requires a regenerative drive to return energy to the building’s power system? A) AC induction motor B) DC shunt motor C) Permanent magnet synchronous motor (PMSM) D) Universal motor Answer: C Explanation: PMSMs can operate with regenerative VFDs that feed excess energy back to the supply. Question 12. A traction elevator uses a VVVF drive. Which of the following is a required installation step? A) Directly connecting the drive output to the motor without a motor starter B) Providing a dedicated disconnect for the VVVF drive within sight of the machine room C) Using a three-wire (L-L-N) supply without a neutral D) Installing a GFCI on the drive input circuit Answer: B Explanation: The VVVF drive must have a dedicated, lockable disconnect within sight of the machine room as required by NEC 620.31.
Ultimate Exam
Question 13. In a hydraulic elevator, the pump motor must be protected by which type of overcurrent device? A) Thermal overload relay only B) Magnetic circuit breaker sized at 125 % of full-load amps C) Instantaneous trip breaker at 150 % of FLA D) No protection is required if the motor is submersible Answer: B Explanation: NEC 620.53 requires a magnetic circuit breaker sized at least 125 % of the motor’s full-load amps. Question 14. Car lighting circuits must be supplied from a dedicated feeder. What is the minimum ampacity of that feeder for a car equipped with 120 W of LED lighting? A) 15 A B) 20 A C) 30 A D) 40 A Answer: A Explanation: 120 W ÷ 120 V = 1 A; applying a 125 % safety factor yields 1.25 A; the smallest standard breaker is 15 A. Question 15. Emergency car lighting must operate for at least how many minutes on battery backup? A) 30 minutes B) 60 minutes C) 90 minutes D) 120 minutes Answer: C Explanation: ASME A17.1 requires a minimum of 90 minutes of emergency lighting for car illumination.
Ultimate Exam
A) Normally open (NO) in series with the motor starter coil B) Normally closed (NC) in series with the motor starter coil C) Parallel with the motor starter coil D) Across the motor terminals Answer: B Explanation: Final limit switches are NC; when actuated they open the circuit and de-energize the motor starter. Question 20. What is the minimum bend radius for a 3-conductor traveling cable rated for 600 V in a hoistway? A) 4 times the cable diameter B) 6 times the cable diameter C) 8 times the cable diameter D) 10 times the cable diameter Answer: B Explanation: NEC 622.30 requires a minimum bend radius of 6 times the overall cable diameter for traveling cables. Question 21. Low-voltage communication wires in an elevator shaft must be shielded and kept at least how many inches away from power conductors? A) 1 inch B) 2 inches C) 4 inches D) 6 inches Answer: C Explanation: NEC 300.3(C) calls for a minimum of 4 inches separation between power and signal conductors in the same raceway. Question 22. The door operator motor in a hoist-way door is typically controlled by which type of device? A) Direct-on-line starter
Ultimate Exam
B) Soft-starter C) Contactor with a holding relay D) Variable frequency drive Answer: C Explanation: Door operators usually use a contactor to start the motor and a holding relay to keep it engaged while the door moves. Question 23. Hall call buttons are required to be wired to which of the following in the control panel? A) Directly to the motor starter B) Through a debounce circuit before the controller input C) To the building’s fire alarm panel only D) To a dedicated 240 V branch circuit Answer: B Explanation: A debounce (filter) circuit prevents false calls caused by contact bounce before the signal reaches the controller. Question 24. In a Phase I fire service operation, which circuit supplies power to the elevator’s fire service panel? A) A dedicated 480 V three-phase line B) The normal passenger service voltage with a manual override switch C) An isolated 120 V transformer with a fire-service breaker D) No power is supplied; the elevator operates on battery only Answer: B Explanation: Phase I fire service uses the existing passenger service voltage with a manual fire-service switch to initiate operation. Question 25. The “safety string” in an elevator refers to: A) The cable that lifts the car B) The series connection of all safety devices that must be closed for motion C) The fire-resistive conduit system
Ultimate Exam
Explanation: CTOS provides a safe location for maintenance personnel to access control wiring while the elevator is locked out. Question 29. Proper grounding of elevator rails must be accomplished by connecting them to: A) The building’s neutral bar only B) The equipment grounding conductor of the feeder circuit C) A separate ground rod in the pit D) The water pipe grounding system Answer: B Explanation: NEC 620.32 requires all metal parts, including rails, to be bonded to the equipment grounding conductor of the feeder. Question 30. When retrofitting a 1970s elevator to meet the 2020 NEC, which of the following is often required? A) Replacing all AC motor windings with DC motors B) Adding GFCI protection to all pit receptacles C) Removing all fire-rated cable and replacing with NM cable D) Converting the machine room to a non-controlled space Answer: B Explanation: GFCI protection for pit receptacles is a newer requirement not present in older codes. Question 31. While troubleshooting, an electrician reads a schematic showing a “|—|” symbol on the power line. This symbol represents: A) A fuse B) A circuit breaker C) A disconnect switch D) A relay coil Answer: C
Ultimate Exam
Explanation: The “|—|” symbol is the standard schematic symbol for a disconnect switch. Question 32. A common fault in elevator VFDs is an unexpected trip due to excessive harmonic currents. The most effective remedy is to install: A) A larger circuit breaker B) A line-reactor (harmonic filter) C) A lower-rated motor D) A thermal overload relay Answer: B Explanation: A line-reactor or harmonic filter reduces harmonic distortion and prevents VFD trips. Question 33. Phase-loss detection in an elevator motor circuit is typically performed by: A) A phase-loss relay that monitors voltage on each phase B) A ground-fault circuit interrupter (GFCI) C) A thermal overload relay D) A manual voltage tester Answer: A Explanation: Phase-loss relays sense the absence of any phase and open the motor starter to protect the motor. Question 34. The lockout/tagout (LOTO) procedure for an elevator disconnect requires that the lock be placed: A) On the circuit breaker’s handle only B) On each disconnecting means that could supply power to the elevator C) On the nearest fire alarm panel D) On the car-top operating station Answer: B
Ultimate Exam
Explanation: NEC Table 310.15(B)(2)(a) shows a 94 % factor for 90 °C conductors at 40 °C ambient. Question 38. NEC 620.23 requires motor overload protection to be set at what percentage of the motor’s full-load amps? A) 80 % B) 100 % C) 115 % D) 125 % Answer: D Explanation: Overload devices must be set at no less than 125 % of the motor’s full-load current. Question 39. The minimum illumination level required in a machine-room pit for maintenance is: A) 5 foot-candles B) 10 foot-candles C) 15 foot-candles D) 20 foot-candles Answer: B Explanation: A17.1 specifies at least 10 foot-candles for pit illumination. Question 40. Emergency lighting in the car is typically supplied at which voltage? A) 12 V DC B) 24 V DC C) 120 V AC D) 277 V AC Answer: A Explanation: Most car-emergency lighting systems use a 12 V DC battery backup.
Ultimate Exam
Question 41. The main disconnect for a traction motor must be sized at least what factor of the motor’s full-load amps? A) 100 % B) 115 % C) 125 % D) 150 % Answer: C Explanation: NEC 620.31 requires the disconnect to be rated at a minimum of 125 % of the motor’s FLA. Question 42. Which conduit type is preferred for fire-resistance when installed in an elevator hoistway? A) PVC conduit B) Rigid metal conduit (RMC) C) Flexible metal conduit (FMC) D) Non-metallic raceway (NM) Answer: B Explanation: RMC provides the highest fire-resistance rating and is acceptable in hoistways. Question 43. ASME A17.1 specifies a minimum clearance of how many inches between a conductor and the hoistway wall? A) 1 inch B) 2 inches C) 3 inches D) 4 inches Answer: B Explanation: A minimum of 2 inches clearance is required to prevent abrasion and heat buildup.
Ultimate Exam
A) #8 AWG
B) #6 AWG
C) #4 AWG
D) #2 AWG
Answer: C Explanation: NEC Table 250.122 specifies #4 AWG copper for a 400 A circuit. Question 48. Which of the following is a required feature of the emergency alarm bell in an elevator? A) Minimum 70 dB sound level at 1 m B) Minimum 75 dB sound level at 1 m C) Minimum 80 dB sound level at 1 m D) Minimum 85 dB sound level at 1 m Answer: B Explanation: A17.1 mandates a minimum of 75 dB for the emergency alarm bell. Question 49. The main disconnect for an elevator must be located: A) Inside the car B) In the machine room or a separate dedicated space within sight of it C) In the building’s main service panel only D) Anywhere the owner prefers Answer: B Explanation: NEC 620.31 requires the disconnect to be in the machine room or a separate space that is readily accessible and within sight. Question 50. For a DC traction motor, the overcurrent protective device must be of which type? A) Thermal overload only B) Magnetic circuit breaker only C) Electronic motor protection (EMP) device
Ultimate Exam
D) Fuses only Answer: C Explanation: DC motors require electronic motor protection devices that can respond quickly to overcurrent conditions. Question 51. The maximum allowable conduit fill for three #6 AWG THHN conductors in a 3/4-in. EMT is: A) 15 % B) 20 % C) 30 % D) 40 % Answer: C Explanation: NEC Table 1 allows up to 30 % fill for more than two conductors in a conduit. Question 52. An isolation transformer is commonly used in elevator installations to: A) Increase voltage to the motor B) Provide a separate ground reference for control circuits C) Reduce current draw from the feeder D) Eliminate the need for a main disconnect Answer: B Explanation: Isolation transformers give control circuitry a separate ground and reduce noise coupling. Question 53. The voltage supplied to the car-top operating station (CTOS) is typically: A) 120 V AC single-phase B) 240 V AC single-phase C) 277 V AC three-phase D) 12 V DC
Ultimate Exam
Explanation: The overspeed switch must open (trip) when the car exceeds 125 % of its rated speed. Question 57. NEC 110.22 requires labeling of VFD controls to include which of the following? A) Manufacturer name only B) Full circuit rating, voltage, and disconnect location C) Wiring diagram only D) Color of the housing Answer: B Explanation: Labels must identify the circuit rating, voltage, and disconnect location for safety and maintenance. Question 58. Dual-system elevators (traction + hydraulic) require how many separate fire-service circuits? A) One B) Two C) Three D) Four Answer: B Explanation: Each system must have its own fire-service circuit, resulting in two separate circuits. Question 59. The recommended inspection interval for traveling cable wear in modern elevators is: A) Every 6 months B) Annually C) Every 2 years D) Every 5 years Answer: B
Ultimate Exam
Explanation: Annual inspections are required to detect abrasion or damage to traveling cables. Question 60. To mitigate harmonic distortion from a VFD, an electrician should install: A) A larger breaker B) A line-reactor or harmonic filter C) A higher-rated motor D) A thermal overload relay Answer: B Explanation: Line-reactors or harmonic filters reduce VFD-generated harmonics. Question 61. After an overspeed governor trips, the proper procedure to reset it is to: A) Flip the main disconnect off and on B) Manually close the overspeed switch after verifying car is at a standstill C) Reset the VFD parameter only D) Replace the governor gear Answer: B Explanation: The overspeed switch must be manually closed only after confirming the car is stopped. Question 62. Which safety relay is commonly used to ensure the car door is locked before the elevator moves? A) Time-delay relay B) Door-lock interlock relay (NC) C) Phase-loss relay D) Motor-run relay Answer: B Explanation: A normally-closed door-lock interlock relay opens the safety circuit if the door is not locked.
