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.
These 10 free IEE questions are organized by exam domain, so you can see how each part of the Introduction to Exploring Electricity blueprint is tested. Reveal the answer and explanation under each question.
A jumper begins to smoke when a learner powers a 12 V lamp circuit. The supply disconnect is safely reachable without approaching the jumper. What takes priority over finding the wiring error?
Correct answer: A - Disconnect the supply safely and alert the instructor before inspection.
A tungsten-filament lamp lights normally at its rated DC voltage and draws its specified current. After the lamp is disconnected and cools, its measured resistance is much lower than its operating resistance. Which conclusion is justified?
Correct answer: B - This is expected; tungsten has greater resistance when hot.
During a DC voltage check, a multimeter displays −12.0 V. Its black lead is in COM and its red lead is in V/Ω. The black probe touches the supply's positive terminal; the red probe touches its negative terminal. With the correct DC voltage function and range already selected, how can the learner obtain a positive indication?
Correct answer: D - Exchange the probe positions and expect a +12.0 V display.
Two lamps are operating normally in separate parallel branches across a 12 V DC source. Only Lamp 2's current is needed. Power is disconnected before inserting a multimeter with its DC current function selected and a suitably rated current input. Where should the meter be inserted for this measurement?
Correct answer: D - In series with Lamp 2, after the two branches separate.
Both lamps in a 12 V trainer suddenly go dark. The lamps are known to be good and wired in parallel, with both branch switches closed. Their returns join at terminal R; one wire connects R to source negative. A voltage check shows 12.0 V across the source and approximately +12.0 V from R to source negative. Assuming one open connection and negligible meter loading, where is the break?
Correct answer: C - The shared negative return
A regulated DC source feeds a fixed resistor R1 before reaching a junction. From that junction, identical fixed resistors R2 and R3 provide separate paths to source negative. The R3 branch is opened while the source voltage stays constant. The voltage across R2 then:
Correct answer: C - Rises because lower source current produces a smaller voltage drop across R1.
A two-lamp display needs independent switches. Switch A currently feeds a junction supplying lamp A and the series combination of switch B with lamp B. Both lamps return directly to the negative terminal of an adequate 12 V source. As a result, opening A also extinguishes lamp B. After isolating the source, which single wiring change will give each switch control of only its own lamp?
Correct answer: A - Move switch B's feed from the junction to source positive.
A 24 V DC source feeds 400 Ω and 800 Ω resistors in series. Treat these values as exact. For continuous operation in this enclosure, the design allows each resistor to dissipate no more than 50% of its nameplate power rating. All listed parts fit. Choose the smallest rating that meets this requirement for the 800 Ω resistor.
Correct answer: B - 1 W
A 12 V lamp trainer must let either of two switches change the lamp's state. Each healthy, two-position SPDT connects common C to either T1 or T2. Source positive feeds S1.C; S2.C feeds the lamp, which returns to source negative. The travelers connect S1.T1 to S2.T2 and S1.T2 to S2.T1. No particular handle orientation is required. How should these connections be assessed?
Correct answer: B - The crossed travelers meet the required two-location switching behavior.
A demonstration door alarm uses a nonlatching relay. Its coil is in series with a contact that closes when the door shuts and opens when the door opens. A separate supply powers a buzzer through COM-NC, keeping it silent with the door shut. The relay and buzzer work correctly, and the buzzer supply remains available. Which single fault could allow the door to open without sounding the buzzer?
Correct answer: D - A jumper bridges the door-contact terminals.
The full bank has 1,020 more IEE questions with explanations.
Continue in the free practice test →
View plans