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General Communications Technician Level 1 (GCT1)
Certification Exam | Latest Verified Questions and
Detailed Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple-choice questions is designed for the General
Communications Technician Level 1 (GCT1) certification exam, an entry-level credential
that validates foundational knowledge in basic electronics, RF theory, land mobile radio
(LMR) systems, test equipment usage, safety protocols, and relevant FCC/FAA regulations.
The exam is modeled after U.S. Department of Homeland Security (DHS) guidelines and
APCO/ANSI technician standards, covering the core competencies needed for success in
public-safety and business/commercial radio communications.
QUESTION 1
Ohm's Law states that voltage equals current multiplied by what?
A) Power
B) Resistance
C) Capacitance
D) Inductance
CORRECT ANSWER: B
EXPERT RATIONALE: Ohm's Law is V = I × R, where V is voltage, I is current, and R is
resistance.
QUESTION 2
What is the typical unit of measurement for capacitance?
A) Henry
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B) Ohm
C) Farad
D) Siemens
CORRECT ANSWER: C
EXPERT RATIONALE: Capacitance is measured in farads (F), representing a component's
ability to store electric charge.
QUESTION 3
Which component allows current to flow in only one direction?
A) Resistor
B) Inductor
C) Capacitor
D) Diode
CORRECT ANSWER: D
EXPERT RATIONALE: A diode is a semiconductor device that conducts current primarily
in one direction, acting as a one-way valve.
QUESTION 4
In a series circuit, the total resistance is equal to:
A) The sum of individual resistances
B) The reciprocal of the sum of reciprocals
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C) The smallest resistance value
D) The largest resistance value
CORRECT ANSWER: A
EXPERT RATIONALE: In a series circuit, resistances add directly: R_total = R1 + R2 + ... +
Rn.
QUESTION 5
What happens to total current in a parallel circuit when an additional resistor is added in
parallel?
A) It decreases
B) It increases
C) It stays the same
D) It becomes zero
CORRECT ANSWER: B
EXPERT RATIONALE: Adding a parallel resistor decreases total resistance, and by Ohm's
Law, total current increases for a constant voltage.
QUESTION 6
Which unit measures the rate of electron flow in a circuit?
A) Volt
B) Watt
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C) Ampere
D) Joule
CORRECT ANSWER: C
EXPERT RATIONALE: Current, measured in amperes (amps), quantifies the flow rate of
electric charge through a conductor.
QUESTION 7
A resistor has color bands: red, red, brown, gold. What is its nominal resistance?
A) 22 ohms
B) 220 ohms
C) 2.2k ohms
D) 22k ohms
CORRECT ANSWER: B
EXPERT RATIONALE: Red=2, red=2, brown=×10, so 22 × 10 = 220 ohms; gold indicates
±5% tolerance.
QUESTION 8
What is the primary purpose of a capacitor in a DC circuit?
A) Amplify signal
B) Store electrical energy in an electric field
C) Generate magnetic field
General Communications Technician Level 1 (GCT1)
Certification Exam | Latest Verified Questions and
Detailed Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple-choice questions is designed for the General
Communications Technician Level 1 (GCT1) certification exam, an entry-level credential
that validates foundational knowledge in basic electronics, RF theory, land mobile radio
(LMR) systems, test equipment usage, safety protocols, and relevant FCC/FAA regulations.
The exam is modeled after U.S. Department of Homeland Security (DHS) guidelines and
APCO/ANSI technician standards, covering the core competencies needed for success in
public-safety and business/commercial radio communications.
QUESTION 1
Ohm's Law states that voltage equals current multiplied by what?
A) Power
B) Resistance
C) Capacitance
D) Inductance
CORRECT ANSWER: B
EXPERT RATIONALE: Ohm's Law is V = I × R, where V is voltage, I is current, and R is
resistance.
QUESTION 2
What is the typical unit of measurement for capacitance?
A) Henry
,2|Page
B) Ohm
C) Farad
D) Siemens
CORRECT ANSWER: C
EXPERT RATIONALE: Capacitance is measured in farads (F), representing a component's
ability to store electric charge.
QUESTION 3
Which component allows current to flow in only one direction?
A) Resistor
B) Inductor
C) Capacitor
D) Diode
CORRECT ANSWER: D
EXPERT RATIONALE: A diode is a semiconductor device that conducts current primarily
in one direction, acting as a one-way valve.
QUESTION 4
In a series circuit, the total resistance is equal to:
A) The sum of individual resistances
B) The reciprocal of the sum of reciprocals
,3|Page
C) The smallest resistance value
D) The largest resistance value
CORRECT ANSWER: A
EXPERT RATIONALE: In a series circuit, resistances add directly: R_total = R1 + R2 + ... +
Rn.
QUESTION 5
What happens to total current in a parallel circuit when an additional resistor is added in
parallel?
A) It decreases
B) It increases
C) It stays the same
D) It becomes zero
CORRECT ANSWER: B
EXPERT RATIONALE: Adding a parallel resistor decreases total resistance, and by Ohm's
Law, total current increases for a constant voltage.
QUESTION 6
Which unit measures the rate of electron flow in a circuit?
A) Volt
B) Watt
, 4|Page
C) Ampere
D) Joule
CORRECT ANSWER: C
EXPERT RATIONALE: Current, measured in amperes (amps), quantifies the flow rate of
electric charge through a conductor.
QUESTION 7
A resistor has color bands: red, red, brown, gold. What is its nominal resistance?
A) 22 ohms
B) 220 ohms
C) 2.2k ohms
D) 22k ohms
CORRECT ANSWER: B
EXPERT RATIONALE: Red=2, red=2, brown=×10, so 22 × 10 = 220 ohms; gold indicates
±5% tolerance.
QUESTION 8
What is the primary purpose of a capacitor in a DC circuit?
A) Amplify signal
B) Store electrical energy in an electric field
C) Generate magnetic field
