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Sample ACMA Standard Theory Exam Practice Questions

Try these sample questions to review concepts for the ACMA Standard Theory Exam exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 120+ question experience with AI tutoring.

1A resistor carries a current of 0.5 A when a voltage of 12 V is applied across it. According to Ohm's Law, what is the resistance of the resistor?
A.6 ohms
B.12 ohms
C.24 ohms
D.60 ohms
Explanation: Ohm's Law states that R = V / I. Substituting the values gives R = 12 V / 0.5 A = 24 ohms. This is a fundamental relationship tested throughout the Standard theory syllabus.
2A circuit dissipates 24 W of power while drawing 2 A of current. What is the voltage across the circuit?
A.6 V
B.12 V
C.26 V
D.48 V
Explanation: Power is given by P = V x I, so V = P / I = 24 W / 2 A = 12 V. The power formula is central to many Standard exam calculation questions.
3Two resistors of 100 ohms and 100 ohms are connected in parallel. What is the total resistance?
A.25 ohms
B.50 ohms
C.100 ohms
D.200 ohms
Explanation: For two equal resistors in parallel, the total resistance is half the value of one resistor: 100 / 2 = 50 ohms. The general rule is 1/Rt = 1/R1 + 1/R2.
4Kirchhoff's Current Law states that at any node in an electrical circuit:
A.The sum of currents entering the node equals the sum of currents leaving it
B.The sum of voltages around the node equals zero
C.The total resistance equals the sum of individual resistances
D.The power dissipated equals the product of voltage and current
Explanation: Kirchhoff's Current Law (KCL) is based on conservation of charge: the total current flowing into a junction must equal the total current flowing out. This is essential for analysing branch currents.
5The capacitive reactance of a capacitor:
A.Increases as frequency increases
B.Decreases as frequency increases
C.Is independent of frequency
D.Is the same as its resistance at all frequencies
Explanation: Capacitive reactance is given by Xc = 1 / (2 x pi x f x C). Because frequency appears in the denominator, Xc decreases as frequency rises. At high frequencies a capacitor passes AC more readily.
6The opposition to alternating current in a purely inductive circuit is called:
A.Inductive reactance
B.Capacitive storage
C.Electrical conductance
D.Carrier modulation
Explanation: Reactance is the opposition to alternating current produced by a pure inductor or capacitor. For an inductor, this opposition is specifically called inductive reactance.
7In a series RLC circuit, resonance occurs when:
A.Inductive reactance equals capacitive reactance
B.Resistance equals inductive reactance
C.The capacitor is fully charged
D.Inductive reactance is twice the capacitive reactance
Explanation: Resonance occurs when XL = Xc. At this frequency the reactances cancel, the circuit impedance is purely resistive and minimum in a series circuit, and current is maximum.
8A sine wave has a period of 2 microseconds. What is its frequency?
A.200 kHz
B.500 kHz
C.2 MHz
D.5 MHz
Explanation: Frequency is the reciprocal of period: f = 1 / T. A period of 2 microseconds is 2 x 10^-6 seconds, so f = 1 / (2 x 10^-6) = 500,000 Hz, or 500 kHz.
9A PN junction diode conducts current when it is:
A.Forward biased, with the anode positive relative to the cathode
B.Reverse biased, with the cathode positive relative to the anode
C.Operated only with alternating current
D.Connected with zero voltage across it
Explanation: A diode conducts when forward biased, meaning the anode is made positive with respect to the cathode by at least the forward voltage drop (about 0.6-0.7 V for silicon). Reverse bias blocks current.
10In an NPN bipolar junction transistor used as an amplifier, the small input signal is typically applied to which terminal?
A.The collector
B.The base
C.The emitter only
D.The substrate
Explanation: In a common-emitter amplifier the input signal is applied to the base. A small base current controls a much larger collector current, providing current and power gain.

About the ACMA Standard Theory Exam Exam

The Standard theory assessment is one of three examination components for the intermediate ACMA Standard Recognition Certificate; candidates must also pass the regulatory and practical components. The 50-question theory paper covers electrical principles, transmitters and receivers, transmission lines and antennas, propagation, measurements, interference and EMC, and safety. Standard operators use the amateur class licence, whose permitted power depends on the frequency band and emission mode.

Exam sponsor: Australian Communications and Media Authority (ACMA). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

The official Standard radio theory assessment is a 50-question multiple-choice paper covering electrical principles, transmitters and receivers, antennas and feedlines, propagation, measurements, EMC and safety. It is one of three examination components: theory, regulations and practical. This free bank provides 100 practice questions for the theory syllabus.

Time Limit

60 minutes for the 50-question theory assessment

Passing Score

70% (35 out of 50)

Exam / Certification Fees

Free to sit with an accredited assessor; a separate ACMA recognition certificate application fee applies after passing

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

Not published

Basic Mathematics

Basic arithmetic and formula use required by the Standard theory syllabus. ACMA provides a formula sheet for the examination.

Not published

Electronic Technical Basics

DC and AC theory, Ohm's and Kirchhoff's laws, power, capacitance, inductance, reactance, resonance, transformers, rectifiers, and semiconductors.

Not published

Transmitters and Receivers

Block diagrams, oscillators, mixers, amplifier classes, AM, FM and SSB modulation, basic digital modes, AGC, ALC, and superheterodyne stages.

Not published

Transmission Lines and Antennas

Feedlines, characteristic impedance, SWR, matching and baluns, dipole, vertical and Yagi antennas, gain, and radiation patterns.

Not published

Propagation

HF, VHF and UHF propagation, ionospheric layers, MUF and critical frequency, ground wave, skywave, fading, and the solar cycle.

Not published

Interference and EMC

Harmonics and spurious emissions, filtering, ferrites, breakthrough, splatter, intermodulation, and electromagnetic compatibility.

Not published

Safety

Electrical safety, earthing, fuses, capacitor discharge, RF exposure limits, and antenna and mast safety near power lines.

Not published

Measurements

Multimeter use, SWR meters, power and PEP measurement, frequency counters, and dummy loads.

Preparing for the ACMA Standard Theory Exam Exam

What You Need to Know

  • Passing score: 70% (35 out of 50)
  • Assessment: The official Standard radio theory assessment is a 50-question multiple-choice paper covering electrical principles, transmitters and receivers, antennas and feedlines, propagation, measurements, EMC and safety. It is one of three examination components: theory, regulations and practical. This free bank provides 100 practice questions for the theory syllabus.
  • Time limit: 60 minutes for the 50-question theory assessment
  • Exam / certification fees: Free to sit with an accredited assessor; a separate ACMA recognition certificate application fee applies after passing Official sources

Using Our Practice Resources

  • Work through all 120 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

ACMA Standard Theory Exam: Suggested Study Strategy

1Practise the calculations supported by the official formula sheet until they are automatic: Ohm's Law, power (P=VI and I squared R), series and parallel resistance, period, frequency, wavelength, efficiency and transformer ratios. Learn reactance and resonance as syllabus concepts rather than inventing unsupported calculation formulas.
2Learn the standard superheterodyne block diagram and what each stage does (RF amplifier, mixer, local oscillator, IF, detector, AGC) so transmitter and receiver questions become quick wins.
3Memorise key antenna and feedline facts: 50-ohm coax, an SWR of 1:1 means a perfect match, half-wave dipole length, and how an ATU and balun work. ACMA does not publish topic weights for the theory paper.
4Review RF and electrical safety, especially keeping masts clear of power lines and discharging high-voltage capacitors, as these questions are straightforward marks if you know the rules.

Frequently Asked Questions

What is the ACMA Standard amateur radio theory assessment?

It is the theory component for the Standard Recognition Certificate, the intermediate Australian amateur radio qualification. It is a 50-question multiple-choice paper covering radio and electronics theory. Candidates must also pass separate regulatory and practical components.

What is the pass mark and time limit for the Standard theory assessment?

The pass mark is 70%, which means at least 35 correct answers out of the 50 questions. Candidates have 60 minutes to complete the theory paper.

Who administers amateur radio exams in Australia now?

Since 19 February 2024, the Australian Communications and Media Authority (ACMA) has administered amateur radio examination services through accredited assessors. The Australian Maritime College (AMC) is no longer involved in amateur examinations or callsign allocation.

What can a Standard licensee do under the amateur class licence?

Since the amateur class licence commenced on 19 February 2024, a person holding the Standard qualification may operate a Standard station without an individual licence. The permitted frequencies, emission modes and maximum power are set by the current class licence and vary by band and mode.