NYC RADIO REPAIR MECHANIC ACTUAL EXAM PREP 2026 ALL QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES ALREADY A GRADED WITH EXPERT FEEDBACK |NEW AND REVISED

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NYC RADIO REPAIR MECHANIC ACTUAL EXAM
PREP 2026 ALL QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES ALREADY
A GRADED WITH EXPERT FEEDBACK |NEW AND
REVISED


1. A radio repair technician measures voltage across a resistor and needs
to calculate current. Which law should be applied to determine the
correct value?
A. Kirchhoff's Law
B. Ohm's Law
C. Faraday's Law
D. Coulomb's Law
Rationale: Ohm's Law (I = V/R) relates voltage, current, and
resistance, making it the correct choice for calculating current when
voltage and resistance are known.
2. The primary function of a radio receiver is to:
A. Transmit signals to a base station
B. Select and demodulate incoming RF signals
C. Amplify power for transmission
D. Convert AC to DC power
Rationale: The primary function of a radio receiver is to select a
desired RF signal from the electromagnetic spectrum and demodulate
it to recover the original information (audio, data).
3. Which component is primarily used to isolate a radio transmitter from
its antenna system to prevent reflected power from damaging the power
amplifier stage?

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A. Diplexer
B. Circulator
C. Combiner
D. Attenuator
Rationale: A circulator directs RF energy from the transmitter to the
antenna while routing reflected power to a dummy load, protecting the
power amplifier from damage due to impedance mismatches.
4. What is the characteristic impedance of standard coaxial cable used in
most radio communications systems?
A. 25 ohms
B. 50 ohms
C. 75 ohms
D. 100 ohms
Rationale: 50 ohms is the standard characteristic impedance for most
RF coaxial cables used in radio communications systems, including
RG-58, RG-213, and LMR-400.
5. What is Standing Wave Ratio (SWR) a measure of?
A. The efficiency of the power supply
B. The impedance match between the transmission line and the
antenna
C. The frequency accuracy of the transmitter
D. The audio output level of the receiver
Rationale: SWR measures the ratio of forward power to reflected
power on a transmission line, indicating how well the antenna system
is matched to the transmitter. A low SWR indicates a good match.
6. Which component in a radio circuit is primarily used to store
electrical energy?
A. Resistor
B. Capacitor

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C. Inductor
D. Diode
Rationale: Capacitors temporarily store electrical energy in an
electrostatic field and release it when needed. They are commonly used
for filtering, coupling, and tuning circuits.
7. What is the main purpose of a capacitor in a radio circuit?
A. To amplify signals
B. To store and release electrical energy
C. To convert AC to DC
D. To regulate current flow
Rationale: Capacitors temporarily store electrical energy and release it
when needed, often used for filtering and tuning circuits.
8. Which component is primarily responsible for controlling the
frequency of a radio transmitter?
A. Resistor
B. Inductor
C. Oscillator
D. Transformer
Rationale: An oscillator generates a periodic waveform at a specific
frequency, setting the radio's transmission frequency.
9. What unit is used to measure electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Rationale: Resistance, which opposes current flow, is measured in
ohms (Ω).
10. What does the term "modulation" refer to in radio communication?

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A. Changing the frequency or amplitude of a carrier signal to
transmit information
B. Increasing the power of a radio signal
C. Converting AC to DC
D. Reducing noise in a circuit
Rationale: Modulation is the process of encoding information onto a
carrier wave for transmission by varying its amplitude, frequency, or
phase.
11. In a superheterodyne receiver, what is the function of the
intermediate frequency (IF) stage?
A. Amplify the signal before transmission
B. Convert the received signal to a fixed frequency for easier
processing
C. Generate carrier waves
D. Control the antenna
Rationale: The IF stage standardizes frequency, making amplification
and filtering more efficient. It converts incoming RF signals to a fixed
frequency regardless of the received channel.
12. Which type of diode allows current to flow in only one direction?
A. Zener diode
B. Light-emitting diode (LED)
C. Rectifier diode
D. Tunnel diode
Rationale: Rectifier diodes conduct current in a single direction,
essential for converting AC to DC.
13. What is the main function of a transformer in a radio power supply?
A. Store energy
B. Increase or decrease voltage