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The BEE-DC exam has 50 questions and runs 1 hours.
These 10 free BEE-DC questions are organized by exam domain, so you can see how each part of the Basic Electricity and Electronics Certification - Direct Current blueprint is tested. Reveal the answer and explanation under each question.
A digital voltmeter connected across a closed control switch in a battery-powered circuit reads 0.00 V. What does this reading establish?
Correct answer: C - Both switch terminals are at essentially equal potential.
An ordinary flyback diode is added across a DC relay coil, with its cathode on the coil's positive side. The relay still pulls in normally, but its contacts release more slowly after the drive is switched off. What explains the slower release?
Correct answer: B - The diode lets coil current decay through a local loop.
Electrolyte splashes from a lead-acid battery into a technician's eye. An eyewash station is immediately beside the bench. Which response takes priority?
Correct answer: A - Begin flushing with water and obtain urgent medical attention.
A resistive test module normally draws 0.20 A at 12 V; its service procedure specifies a supply current limit of 0.25 A. Wiring and resistance checks pass. The supply is set to 12 V with a 0.10 A current limit, but its output display shows 6.0 V, 0.10 A, and CC. Select the appropriate next step.
Correct answer: A - Set the current limit to the specified 0.25 A and repeat the test.
A 48 V DC circuit requires a 1 A time-delay fuse and can deliver 600 A into a fault. Four replacements fit the holder and have the required time-delay characteristic. Their interrupting ratings apply at the listed voltage and current type. Select the replacement that meets all three electrical requirements.
Correct answer: D - 1 A; 60 V DC; 1,000 A interrupting rating
With one lead of an ordinary silicon rectifier disconnected from a deenergized circuit, a verified multimeter in diode-test mode reads 0.63 V with red on the anode and black on the cathode. Reversing the probes produces OL. Which service note is justified?
Correct answer: A - The readings show expected forward conduction and reverse blocking.
A functional check requires load current to be within ±5% of a 120.0 mA target. The measured current is 112.8 mA; measurement uncertainty is negligible for this check. Which assessment uses the target correctly as the percentage reference?
Correct answer: B - Reject; the current is 6.0% below target.
Two calibrated DMMs disagree at a DC test point fed through a verified 100 kΩ resistor. The 1 MΩ-input meter reads 9.09 V; the 10 MΩ-input meter reads 9.90 V. Alternating the meters reproduces both readings, while voltage on the source side of the resistor stays at 10.00 V. Neither meter is overrange, and there is no other load. What best accounts for the difference?
Correct answer: D - The 1 MΩ meter loads the test point more heavily.
A 24 V resistive heater produces less heat than usual. Its unplugged connector measures 24 V. With the heater connected, the source still measures 24 V but the heater receives 18 V. Under that same load, the end-to-end voltage drop is 5.8 V along the positive feed path and 0.2 V along the return path. Which fault best explains the weak heating?
Correct answer: C - Excessive resistance in the positive feed path.
A 24 V source feeds R1 and then node X. R2 and R3 each connect X to source negative. After a single fault, source current rises above its recorded normal value, and X reads +24 V relative to source negative. The supply maintains 24 V; wiring and meter effects are negligible. Identify the fault consistent with both changes.
Correct answer: D - R1 has been bypassed by a short.
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