10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The EL exam has 100 questions and runs 4 hours.
These 10 free EL questions are organized by exam domain, so you can see how each part of the Ohio Electrical Contractor License Exam blueprint is tested. Reveal the answer and explanation under each question.
Two equally rated 480 V to 208Y/120 V transformers are proposed for parallel operation. Their ratios, tap settings, polarity, phase sequence, and phase displacement match, but one transformer has 3% impedance and the other has 6% impedance. What operating result should be expected under load?
Correct answer: D - The 3% unit will carry more load and may overload before the 6% unit
A 2,000 ft² dwelling is calculated by the standard method. It has two required small-appliance circuits, one laundry circuit, one 10 kW household range, one 4.2 kW dryer, and four qualifying fastened-in-place resistive appliances totaling 16 kVA. A 9 kW air-conditioning load and 12 kW electric heat are interlocked so they cannot operate together. No other loads apply. What is the calculated service load?
Correct answer: B - 42,625 VA
Which feeder is eligible for the dwelling-unit 83% ampacity allowance under the stated conditions?
Correct answer: D - A 200 A feeder supplying the entire load associated with one individual dwelling unit
A device box contains six 12 AWG insulated conductors that enter and are spliced or terminated, one receptacle yoke connected to 12 AWG conductors, one set of internal cable clamps, and six 12 AWG equipment grounding conductors. All pigtails originate and remain in the box. Using 2.25 in³ per 12 AWG allowance, what minimum box volume is required?
Correct answer: C - 23.625 in³
A 0-200 psi pressure transmitter normally sends a 4-20 mA signal. The local mechanical gauge reads about 100 psi, but the PLC input is 0.2 mA. Which diagnosis should be investigated first?
Correct answer: C - Loop power is lost or the signal circuit is open
A standby generator neutral remains solidly connected through a three-pole transfer switch to the service neutral. The generator neutral is bonded to its frame, and the service neutral is bonded at the service disconnect. Objectionable current appears on equipment grounding paths during generator operation. What is causing the current?
Correct answer: D - A duplicate neutral-to-ground bond on a non-separately derived generator
Two 48 A EVSE units are connected to a listed energy-management system that limits their combined continuous output to 64 A under all operating conditions. Before applying the 125% continuous-load factor, what current should be used as the feeder load contribution?
Correct answer: C - 64 A, the controlled aggregate maximum
An air-conditioning condensing unit is marked MCA 31 A and MOCP 50 A. The proposed circuit uses 10 AWG copper conductors with 35 A ampacity at the terminals and a 50 A inverse-time breaker. No other nameplate restriction applies. How should the proposal be evaluated?
Correct answer: A - Accept it: conductor ampacity exceeds MCA and the breaker does not exceed MOCP
Propane vapor is normally confined in a closed process and would be released only by an accidental rupture. The vapor's ignition temperature is 170°C. Which equipment marking matches the location and has a maximum surface temperature below the ignition temperature?
Correct answer: A - Class I, Division 2, Group D, T3B (165°C)
A generator supplies Article 700 egress lighting and optional refrigeration through automatic transfer equipment. During a utility outage, the egress lighting is available in 8 seconds, and the refrigeration is shed until capacity becomes available. Which statement is accurate?
Correct answer: C - It can comply if emergency loads retain priority and the source can carry them
The EL exam also covers these domains. Drill them in the full free practice test:
The full bank has 1,020 more EL questions with explanations.
Continue in the free practice test →
View plans