100+ Free ACMA Standard Theory Exam Practice Questions

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Sample ACMA Standard Theory Exam Practice Questions

Try these sample questions to test your ACMA Standard Theory Exam exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ 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 inductive reactance of an inductor at a given frequency is calculated using which formula?

A.XL = 2 x pi x f x L

B.XL = 1 / (2 x pi x f x L)

C.XL = L / (2 x pi x f)

D.XL = 2 x pi x f / L

Explanation: Inductive reactance is XL = 2 x pi x f x L, where f is frequency in hertz and L is inductance in henries. It increases proportionally with both frequency and inductance.

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 resonant circuit uses a 100 microhenry inductor and a 100 picofarad capacitor. The resonant frequency is approximately:

A.159 kHz

B.1.59 MHz

C.15.9 MHz

D.159 MHz

Explanation: The resonant frequency is f = 1 / (2 x pi x sqrt(L x C)). With L = 100 microhenries and C = 100 picofarads, sqrt(LC) = sqrt(1e-4 x 1e-10) = 1e-7, giving f = 1 / (2 x pi x 1e-7) which is about 1.59 MHz.

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 Recognition Certificate theory assessment is the intermediate Australian amateur radio qualification administered under the ACMA framework. Since the Radiocommunications (Amateur Stations) Class Licence commenced in February 2024, a person who holds the Standard qualification may operate a Standard amateur station under the class licence with up to 100 W PEP on a wide range of HF, VHF and UHF bands. The theory syllabus covers electrical principles, transmitters and receivers, transmission lines and antennas, propagation, measurements, interference and EMC, and safety.

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. A separate Regulations assessment covers the licence conditions. This free bank provides 100 practice questions for the theory syllabus.

Time Limit

About 1 hour for the 50-question theory assessment

Passing Score

70% (35 out of 50)

Exam Fee

ACMA recognition certificate application fee around $48, plus assessor session fees set by the accredited assessor (Australian Communications and Media Authority (ACMA))

ACMA Standard Theory Exam Exam Content Outline

22%

Electrical Principles and Components

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

22%

Transmitters and Receivers

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

18%

Transmission Lines and Antennas

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

13%

Propagation

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

10%

Measurements

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

Interference and EMC

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

Safety

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

How to Pass 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. A separate Regulations assessment covers the licence conditions. This free bank provides 100 practice questions for the theory syllabus.
Time limit: About 1 hour for the 50-question theory assessment
Exam fee: ACMA recognition certificate application fee around $48, plus assessor session fees set by the accredited assessor

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

ACMA Standard Theory Exam Study Tips from Top Performers

1Practise the core calculations until they are automatic: Ohm's Law, power (P=VI and I squared R), series and parallel resistance, reactance, resonant frequency, and wavelength from frequency.

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, since this section is worth around 18 percent.

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 examination for the Standard Recognition Certificate, the intermediate Australian amateur radio qualification. It is a 50-question multiple-choice paper covering radio and electronics theory. A separate Regulations assessment covers the licence conditions.

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 are generally allowed about one hour to complete the theory paper.

Who administers amateur radio exams in Australia now?

Since 2023 the Australian Communications and Media Authority (ACMA) has had responsibility for amateur radio qualifications, working 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 in February 2024, a person holding the Standard qualification may operate a Standard station without an individual licence. The Standard level permits up to about 100 W peak envelope power across a wide range of HF, VHF and UHF bands.