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 BEE-AC exam has 50 questions and runs 1 hours.
These 10 free BEE-AC questions are organized by exam domain, so you can see how each part of the Basic Electricity and Electronics - Alternating Current blueprint is tested. Reveal the answer and explanation under each question.
A 100 Ω noninductive test resistor is driven by a pulse train that stays at +20 V for one quarter of each cycle and at 0 V for the rest. Neglect the switching intervals. What average power must the resistor dissipate?
Correct answer: B - 1.0 W
In a guarded test fixture, a nonlatching changeover relay receives its rated coil supply and the armature moves fully. The contacts are disconnected from external wiring. Energizing the coil opens C-NC, but C-NO stays open with the coil either energized or de-energized. Troubleshooting can now focus on:
Correct answer: A - A failed NO contact path despite full armature travel.
A choke is rated for 1.8 A RMS thermally. Its saturation current is 1.2 A, defined at a 20% inductance decrease. Under the specified conditions, a pulsed current measures 0.8 A RMS with 2.0 A peaks. Which rating assessment is correct?
Correct answer: D - Only the saturation-current rating is exceeded.
Two isolated, equal-voltage transformer secondaries each deliver their specified AC output. Connected in series for a higher voltage, they give nearly zero volts between the free ends. The primary supply and lead continuity are correct. With power isolated, which wiring change will produce the required series output?
Correct answer: C - Reverse the leads of one secondary, retaining the series connection.
On an unloaded stand-alone wound-field alternator, both voltage and frequency are low. Increasing field excitation restores rated voltage, while measured shaft speed remains unchanged. Predict the frequency after this adjustment.
Correct answer: D - It remains low; changing excitation has not corrected the speed.
A fan’s permanent split capacitor (PSC) motor starts promptly, reaches its normal speed, and stays below nameplate current. Its auxiliary winding and capacitor continue carrying current after acceleration. The maintenance note should describe this as:
Correct answer: C - Normal operation of the auxiliary circuit in a PSC motor.
An unloaded RC low-pass circuit has a series resistor and a capacitor from output to return. It now passes a sine wave almost unchanged at a frequency it previously attenuated. The source and return are intact. After de-energization, discharge, and verification of zero voltage, an isolated resistance check confirms the resistor is correct. Which single fault fits the evidence?
Correct answer: D - An open capacitor.
A function generator has a 50 Ω output resistance and selectable 50 Ω or high-impedance load displays. Its 50 Ω display is set to 2.0 V peak-to-peak, but a correctly configured 1 MΩ oscilloscope reads a clean 4.0 V peak-to-peak sine wave. Before using it to drive a high-impedance input, the technician should:
Correct answer: A - Select the high-impedance load display, then set the required amplitude.
A compatible 10× passive probe shows rounded leading corners on an oscilloscope’s square-wave compensation output. A reference probe gives the expected square corners on the same channel; both traces trigger steadily. The first probe needs which setup correction?
Correct answer: A - Adjust its compensation trimmer to obtain the correct square-wave shape.
A site requires voltage-tester checks before and after proving a circuit de-energized. A qualified technician obtains a valid initial check, then zero at every required point on the isolated circuit. The final check fails; another instrument confirms the proving source is still live. What is required before work begins?
Correct answer: B - Use a functioning rated tester and repeat the complete verification.
The BEE-AC exam also covers these domains. Drill them in the full free practice test:
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