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 TCM exam has 75 questions and runs 2 hours.
These 10 free TCM questions are organized by exam domain, so you can see how each part of the Telecommunications Electronics Technician (TCM) blueprint is tested. Reveal the answer and explanation under each question.
A technician must replace a damaged section of coaxial cable on a legacy 10Base2 network segment. To preserve correct operation, the replacement RG-58 cable must have a characteristic impedance of:
Correct answer: A - 50 ohms
A permanent link is terminated to T568A at the telecommunications room and to T568B at the work area outlet. The result is:
Correct answer: B - A crossover, because the orange and green pairs are transposed
At a site using loop start trunks, users occasionally seize an outside line and find themselves immediately connected to an incoming caller who was never announced. Reconfiguring the trunks to which signaling method will eliminate this condition?
Correct answer: C - Ground start signaling
A subscriber dials a toll-free number. Before the call can be completed, the originating switch must query a database to obtain the actual terminating number. Which SS7 element holds that database?
Correct answer: C - The Service Control Point (SCP)
While terminating a 25-pair cable, a technician needs to locate pair 14. Which color combination identifies that pair?
Correct answer: B - Black/Brown
A technician is documenting an ISDN Basic Rate Interface installation. What is the bandwidth of the D channel on this interface?
Correct answer: A - 16 kbps
A horizontal cable run measures 94 meters from the patch panel in the telecommunications room to the work area outlet. Under ANSI/TIA-568, this run is:
Correct answer: D - Non-compliant, because the permanent link is limited to 90 meters
A Category 6 permanent link shows correct pin-to-pin continuity on all eight conductors, and the terminations are tight with minimal untwist. The link still fails NEXT by a wide margin. Which fault is MOST likely?
Correct answer: C - A split pair
A signal enters a transmission path at +12 dBm, passes through a cable section with 15 dB of loss, and then through an amplifier providing 8 dB of gain. What is the level at the output?
Correct answer: B - +5 dBm
In a satellite communications link, the downlink frequency is higher than the uplink frequency.
Correct answer: B - False
The TCM exam also covers these domains. Drill them in the full free practice test:
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