Free Tennessee LLE - Limited Licensed Electrician Practice Questions

Sample Practice Questions

Try these 10 sample questions from the Tennessee LLE - Limited Licensed Electrician practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1An electrician checks a 120 V DC test circuit containing 12 Ω and 8 Ω resistors in series. Ignoring lead resistance, what current should the ammeter indicate?

   1. A.6 ACorrect answer: A
   2. B.10 A
   3. C.12 A
   4. D.15 A

   Explanation: DOE states, "Applied voltage equals circuit current times the circuit resistance." Series resistance is 12 + 8 = 20 Ω, so I = 120 V ÷ 20 Ω = 6 A; no rounding is needed. 10 A omits the 8 Ω resistor, 15 A omits the 12 Ω resistor, and 12 A divides by the average resistance (10 Ω) instead of the sum.

   Reference: DOE Fundamentals Handbook: Electrical Science, Volume 1 — Module ES-01, Ohm’s Law, pp.14–15

2. 2An electrician installs listed equipment on a Tennessee construction project. Which document controls installation details that are included as conditions of its listing?

   1. A.The instructions included in the equipment listing.Correct answer: A
   2. B.The purchase specifications supplied by the distributor.
   3. C.The installation notes retained from the previous unit.
   4. D.The catalog description supplied with the sales quote.

   Explanation: OSHA requires installation "in accordance with instructions included in the listing, labeling, or certification." The applicable listing instructions control. Purchase specifications, previous-unit notes, and sales descriptions do not replace those instructions.

   Reference: OSHA Construction Standards: General Electrical Requirements — 1926.403(b)(2)

3. 3An electrician installs a single receptacle on an individual 20 A branch circuit at a construction site. What is the minimum receptacle ampere rating permitted by OSHA?

   1. A.15 A
   2. B.20 ACorrect answer: B
   3. C.30 A
   4. D.40 A

   Explanation: OSHA requires a rating "not less than that of the branch circuit." The minimum is therefore 20 A. Fifteen amperes is below the circuit rating; the larger ratings exceed the minimum asked.

   Reference: OSHA Construction Standards: 29 CFR 1926.404 — 1926.404(b)(2)(i)

4. 4An electrician reviews construction-site fuses and thermal cutouts rated 600 V or less. Apart from the specified supply-side current-limiting exception, above which voltage-to-ground boundary does OSHA require disconnecting means for all such devices?

   1. A.50 V
   2. B.120 V
   3. C.150 VCorrect answer: C
   4. D.300 V

   Explanation: OSHA requires disconnecting means for "all fuses and thermal cutouts on circuits over 150 volts to ground", apart from the stated supply-side exception. The boundary is 150 V, with the requirement applying above it. The other voltages are not this provision’s threshold; accessible cartridge fuses are also covered separately by the rule.

   Reference: OSHA Construction Standards: 29 CFR 1926.404 — 1926.404(e)(1)(iii)

5. 5An electrician installs a three-wire DC premises-wiring system on a construction project. Which system conductor does OSHA require to be grounded?

   1. A.The positive outside conductor
   2. B.The negative outside conductor
   3. C.The neutral conductorCorrect answer: C
   4. D.Either outside conductor

   Explanation: OSHA states, "All 3-wire DC systems shall have their neutral conductor grounded." The positive and negative outside conductors are not the specified system-grounding point.

   Reference: OSHA Construction Standards: 29 CFR 1926.404 — 1926.404(f)(1)(i)

6. 6An electrician specifies insulation for general wiring on a construction project. Which set of service conditions does OSHA expressly require the insulation type to suit?

   1. A.Voltage, power factor, and phase sequence
   2. B.Current frequency, impedance, and duty cycle
   3. C.Voltage, operating temperature, and locationCorrect answer: C
   4. D.Starting current, phase angle, and efficiency

   Explanation: OSHA requires insulation suitable for "the voltage, operating temperature, and location of use." The other sets contain real electrical quantities, but they do not state the three insulation-selection conditions required by this rule.

   Reference: OSHA Construction Standards: Wiring Methods and Cables — 1926.405(f)

7. 7An electrician joins a metal raceway to a junction box at a construction site. Which property must the assembled raceway-to-box connection maintain under OSHA?

   1. A.Electrical continuityCorrect answer: A
   2. B.Thermal isolation
   3. C.Magnetic shielding
   4. D.Galvanic isolation

   Explanation: OSHA requires the connection to "provide effective electrical continuity." Thermal isolation, magnetic shielding, and galvanic isolation describe different properties; galvanic isolation in particular would interrupt the required conductive connection.

   Reference: OSHA Construction Standards: 29 CFR 1926.405 — 1926.405(a)(1)(i)

8. 8At a construction work area, ignitible concentrations of flammable solvent vapor may exist during normal operation. Which hazardous-location classification matches that condition?

   1. A.Class I, Division 1Correct answer: A
   2. B.Class I, Division 2
   3. C.Class II, Division 1
   4. D.Class III, Division 1

   Explanation: The Class I, Division 1 definition includes places "In which ignitible concentrations of flammable gases or vapors may exist under normal operating conditions". Division 2 addresses specified abnormal-release conditions; Classes II and III concern dust and fibers rather than this vapor condition.

   Reference: OSHA Construction Standards: 29 CFR 1926.449 — 1926.449, Class I locations, paragraph (a)(1)

9. 9An electrician specifies the source for a Class 1 power-limited signaling circuit on a construction project. Which pair gives OSHA’s maximum rated source voltage and apparent power?

   1. A.30 V and 1,000 VACorrect answer: A
   2. B.30 V and 100 VA
   3. C.60 V and 1,000 VA
   4. D.150 V and 100 VA

   Explanation: OSHA specifies "not more than 30 volts and 1000 volt-amperes." The first pair gives both published maxima. The other pairs change one or both limits; a smaller power value may be usable but is not the maximum asked.

   Reference: OSHA Construction Standards: Special and Communications Systems — 1926.408(b)(1)(i)(A)

10. 10An electrician wires a portable Edison-base lamp for construction use. Which part of the lamp assembly must be connected to the identified grounded conductor?

    1. A.The center contact
    2. B.The metal guard
    3. C.The screw shellCorrect answer: C
    4. D.The handle fitting

    Explanation: OSHA requires the grounded conductor to be "attached to the screw shell and the identified blade of the attachment plug." The center contact is the other lamp circuit contact; the metal guard uses equipment grounding, not this grounded circuit conductor.

    Reference: OSHA Construction Standards: Wiring and General-Use Equipment — 1926.405(j)(1)(iii)