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The GCT2 exam has 100 questions and runs 2 hours.
These 10 free GCT2 questions are organized by exam domain, so you can see how each part of the General Communications Technician - Level 2 (GCT2) blueprint is tested. Reveal the answer and explanation under each question.
A maintenance procedure permits replacement of a battery-fed distribution busbar while energized because the circuit is only 24 V to ground. However, the site's assessment identifies enough available fault current to cause severe arc burns if a tool bridges the busbars. The battery and charger each have an upstream isolating device. How must the procedure be corrected?
Correct answer: D - Isolate and lock out all sources; verify the busbar is deenergized.
A mobile radio receives normally but resets whenever it is keyed. The DC supply is rated for the required transmit current, and the reset also occurs into a suitable dummy load. To distinguish a collapsing supply output from excessive voltage loss in the DC feed, which pair of readings would be most useful?
Correct answer: C - Source voltage and radio-terminal voltage during the same transmit event
The modulation-quality profile for a P25 Phase 2 TDMA voice test is still set for the subscriber uplink. The next measurement is on the base-station downlink. Which modulation belongs in the new profile?
Correct answer: B - H-DQPSK
A transmitter will run at 20 W continuous output during an analyzer test. The analyzer input must not exceed 100 mW. All connections are 50 ohms, and the attenuator ratings below apply at the test frequency. Select the attenuator that provides sufficient attenuation and can withstand the transmitter's continuous output.
Correct answer: B - 30 dB attenuation; 25 W continuous input rating
Both ends of a new cable have this pin order, 1 through 8: white/orange, orange, white/green, green, white/blue, blue, white/brown, brown. Straight-through continuity passes, but crosstalk testing fails. To restore T568B pairing, the technician should make which change?
Correct answer: A - Exchange the conductors at pins 4 and 6 at both ends.
Following an outage, a 24 V standby battery is charging normally and has recovered to 24.0 V. Its low-voltage disconnect opens at 22.0 V and reconnects at 25.0 V. The battery feed remains disconnected; the repeater is operating from a verified independent supply, with no battery or charger fault indications. What response is appropriate at this stage of recovery?
Correct answer: D - Let charging continue and check for automatic reconnection.
During a calibrated ISO-TEE sensitivity test, a receiver reaches 12 dB SINAD with a −118 dBm test signal when a nearby off-channel transmitter is idle. It needs −108 dBm when that transmitter operates. The injection point remains unchanged, and adding a receive preselector in the antenna path restores the original result. What best explains this pattern?
Correct answer: C - The off-channel transmitter is desensitizing the receiver.
A laptop receives valid radio status messages through a serial adapter but sends no commands. Both ends use 9600 bit/s, 8N1. The laptop is configured for required RTS/CTS flow control and reports that it is waiting for CTS. The cable carries only TXD, RXD and signal ground. Hardware flow control must be retained. What should change?
Correct answer: C - Use the specified cable with RTS and CTS conductors.
Errors begin after a long optical fronthaul run is replaced with a short jumper. At the operating wavelength, a power meter reads −1 dBm at the receiver input; the specified receiver range is −20 to −3 dBm. The transceivers and fiber are compatible. Which intervention follows from the measured power?
Correct answer: A - Add suitable optical attenuation and verify the receiver input again.
During receive-only setup of a portable satellite terminal, a broadband finder shows a strong peak but the modem has no carrier lock. The receive frequency, polarization and LNB local-oscillator setting match the assigned service. Which check best distinguishes correct service acquisition from peaking on an unintended satellite?
Correct answer: D - Sweep near predicted pointing angles and verify the assigned carrier's identity after lock.
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