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 BST exam has 75 questions and runs 2 hours.
These 10 free BST questions are organized by exam domain, so you can see how each part of the Basic Systems Technician blueprint is tested. Reveal the answer and explanation under each question.
A technician has notified affected personnel, shut down a motor control cabinet, opened and locked the disconnect, applied a personal danger tag, and bled the stored pressure from the pneumatic actuator. Before opening the cabinet and beginning work, the FINAL required step is to:
Correct answer: D - Test for voltage to confirm a zero-energy state
A motor control panel catches fire. The technician opens the upstream disconnect, removing all power from the panel, but the wiring insulation and plastic wire duct continue to burn. The fire is now classified as:
Correct answer: A - Class A
A signal passes through eight cascaded stages. Using the half-split method, a technician measures at the output of stage 4 and finds the signal present and correct. Where should the next measurement be taken?
Correct answer: C - At the output of stage 6
Before shipping, a manufacturer operates every completed assembly at elevated temperature under full load for 48 hours. This process is intended primarily to:
Correct answer: D - Force early-life failures to occur before shipment
An amplifier delivers four times as much output power as it receives at its input. Expressed in decibels, this gain is closest to:
Correct answer: C - 6 dB
While stripping solid 22 AWG conductors, a technician's stripper repeatedly nicks the copper. The MOST significant long-term consequence is:
Correct answer: B - A stress point may fracture and open under vibration
A new Category 6 permanent link passes a basic continuity check with all eight conductors landed pin-for-pin at both ends, yet fails certification for near-end crosstalk. The MOST likely cause is:
Correct answer: D - Two conductors were taken from different twisted pairs
Which cable substitution is permitted under the National Electrical Code?
Correct answer: A - CMP installed in a riser
A run is upsized from 20 AWG to 14 AWG. The cross-sectional area of the new conductor is approximately:
Correct answer: B - 4 times the original
Four 12-volt, 100 amp-hour batteries are wired in series. The resulting bank is rated:
Correct answer: C - 48 volts, 100 amp-hours
The BST exam also covers these domains. Drill them in the full free practice test:
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