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The BEE-A exam has 50 questions and runs 1 hours.
These 10 free BEE-A questions are organized by exam domain, so you can see how each part of the Basic Electricity and Electronics - Analog blueprint is tested. Reveal the answer and explanation under each question.
A Zener shunt regulator has a fixed series resistor, a variable input supply, and a variable load current drawn from the output. Two checks are needed: first, the condition most likely to leave too little Zener current for regulation; second, the condition producing the greatest Zener dissipation. Which operating conditions should be tested, in that order?
Correct answer: C - Minimum input with maximum load current; maximum input with minimum load current.
A designer proposes driving a grounded-source N-channel MOSFET directly from a 3.3 V logic output to switch a 2 A load. The specifications give a 2.0 V gate threshold at 250 µA and an on-resistance of 0.04 Ω at 10 V gate-to-source drive. What is still needed to establish that this part will have a low-resistance ON state in the proposed circuit?
Correct answer: D - A guaranteed on-resistance at 3.3 V gate-to-source drive.
An SCR driving an inductive load switches off as soon as its gate pulse ends. Its normal ON-state current would be 200 mA, and gate-current amplitude meets the trigger specification. At pulse removal, main current is only 20 mA; latching and holding currents are specified as 30 mA and 10 mA. Which gate-pulse change addresses the demonstrated problem?
Correct answer: A - Keep the pulse present until main current exceeds the latching requirement.
After a heatsink is fitted, an LM317 supply that previously regulated correctly collapses into current limiting. The TO-220 tab was bolted directly to a chassis bonded to the supply's DC return; this package connects its tab internally to OUT. Power is now removed and the capacitors are discharged. Which repair corrects the mounting fault?
Correct answer: A - Fit an insulating thermal pad and an insulating screw bushing.
A 60 Hz supply has a full-wave bridge, reservoir capacitor, and linear regulator. Its transformer secondary waveform is normal. With a steady resistive load, the capacitor now recharges 60 times per second instead of 120, and the DC output has fallen. The external bridge connections are intact. Which single fault accounts for the missing alternate recharge pulses?
Correct answer: B - One bridge diode is open.
A stable DC rail must be between 4.90 V and 5.10 V. A DMM displays 5.08 V on a range with 0.01 V per count and accuracy of ±(0.5% of reading + 2 counts). All stated meter operating conditions are met. Is this measurement sufficient to establish that the rail meets its voltage requirement?
Correct answer: C - No; its possible voltage range includes both acceptable and excessive values.
Equal true-RMS voltages are applied in turn to the same noninductive resistor: first a zero-mean sine wave, then a zero-mean symmetric square wave. The resistance remains constant. Relative to the sine wave, the square wave produces:
Correct answer: D - The same average heating with a lower peak voltage
A complementary emitter-follower output stage leaves a narrow notch at each zero crossing during a low-level sine-wave test. The incoming signal is clean, both supply rails are correct, and neither output peak is flattened. The most informative next measurement is:
Correct answer: A - The output pair's base-to-base bias with no input signal.
At 1 kHz, an inverting op-amp stage produces a clean sine wave. At 20 kHz, small outputs are still clean, but larger outputs become nearly triangular with straight sloping sides. The input remains sinusoidal, the resistive load is within the output-current rating, and the output stays well inside its voltage-swing limits. This amplitude-dependent distortion is characteristic of:
Correct answer: B - Insufficient slew rate.
A noninverting Schmitt trigger has a 3.0 V rising threshold and a 2.0 V falling threshold. The input starts at 0 V, rises to 3.4 V, then falls to 2.5 V. It subsequently fluctuates between 2.3 V and 2.7 V. Throughout those fluctuations, the output should:
Correct answer: B - Remain high; the lower threshold has not been crossed.
The BEE-A exam also covers these domains. Drill them in the full free practice test:
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