ASTM NCATT RF Systems Fundamentals
Assessment Newest (2025 - 2026
Update) From Real Past Papers
Questions – A Set Of 100 Most Common
Exam Frequently Tested Questions And
Answers In Details 100% Verified Exam
Highly Recommendable For Grade A+
1. Which quantity is measured in hertz (Hz)?
A. Power
B. Voltage
C. Frequency
D. Resistance
Answer: C. Frequency
Frequency is the number of cycles occurring each second and is measured in hertz.
2. RF stands for:
A. Radio Format
B. Relay Frequency
C. Radio Frequency
D. Range Frequency
Answer: C. Radio Frequency
RF refers to the portion of the electromagnetic spectrum used for wireless
communications.
, 3. The speed of radio waves in free space is approximately:
A. 300,000 m/s
B. 3,000,000 m/s
C. 30,000,000 m/s
D. 300,000,000 m/s
Answer: D. 300,000,000 m/s
Electromagnetic waves travel at the speed of light in free space.
4. Wavelength is inversely proportional to:
A. Voltage
B. Resistance
C. Current
D. Frequency
Answer: D. Frequency
As frequency increases, wavelength decreases.
5. Which instrument is commonly used to measure RF signal strength?
A. Voltmeter
B. Ohmmeter
C. Spectrum analyzer
D. Clamp meter
Answer: C. Spectrum analyzer
A spectrum analyzer displays signal amplitude versus frequency.
6. The SI unit of power is:
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: D. Watt
Power is measured in watts.
, 7. Which device amplifies an RF signal?
A. Oscillator
B. Filter
C. Duplexer
D. Amplifier
Answer: D. Amplifier
RF amplifiers increase signal power.
8. A coaxial cable is designed primarily to:
A. Produce RF signals
B. Measure RF power
C. Transmit RF signals with low loss
D. Store electrical energy
Answer: C. Transmit RF signals with low loss
Coaxial cable provides shielding and efficient RF transmission.
9. Which impedance is standard for most RF communication systems?
A. 25 Ω
B. 50 Ω
C. 75 Ω
D. 300 Ω
Answer: B. 50 Ω
Most RF transmitting equipment uses a 50-ohm impedance.
10.Which impedance is commonly used for television distribution?
A. 25 Ω
B. 50 Ω
C. 75 Ω
D. 150 Ω
Answer: C. 75 Ω
Television and video systems commonly use 75-ohm coaxial cable.
Assessment Newest (2025 - 2026
Update) From Real Past Papers
Questions – A Set Of 100 Most Common
Exam Frequently Tested Questions And
Answers In Details 100% Verified Exam
Highly Recommendable For Grade A+
1. Which quantity is measured in hertz (Hz)?
A. Power
B. Voltage
C. Frequency
D. Resistance
Answer: C. Frequency
Frequency is the number of cycles occurring each second and is measured in hertz.
2. RF stands for:
A. Radio Format
B. Relay Frequency
C. Radio Frequency
D. Range Frequency
Answer: C. Radio Frequency
RF refers to the portion of the electromagnetic spectrum used for wireless
communications.
, 3. The speed of radio waves in free space is approximately:
A. 300,000 m/s
B. 3,000,000 m/s
C. 30,000,000 m/s
D. 300,000,000 m/s
Answer: D. 300,000,000 m/s
Electromagnetic waves travel at the speed of light in free space.
4. Wavelength is inversely proportional to:
A. Voltage
B. Resistance
C. Current
D. Frequency
Answer: D. Frequency
As frequency increases, wavelength decreases.
5. Which instrument is commonly used to measure RF signal strength?
A. Voltmeter
B. Ohmmeter
C. Spectrum analyzer
D. Clamp meter
Answer: C. Spectrum analyzer
A spectrum analyzer displays signal amplitude versus frequency.
6. The SI unit of power is:
A. Volt
B. Ampere
C. Ohm
D. Watt
Answer: D. Watt
Power is measured in watts.
, 7. Which device amplifies an RF signal?
A. Oscillator
B. Filter
C. Duplexer
D. Amplifier
Answer: D. Amplifier
RF amplifiers increase signal power.
8. A coaxial cable is designed primarily to:
A. Produce RF signals
B. Measure RF power
C. Transmit RF signals with low loss
D. Store electrical energy
Answer: C. Transmit RF signals with low loss
Coaxial cable provides shielding and efficient RF transmission.
9. Which impedance is standard for most RF communication systems?
A. 25 Ω
B. 50 Ω
C. 75 Ω
D. 300 Ω
Answer: B. 50 Ω
Most RF transmitting equipment uses a 50-ohm impedance.
10.Which impedance is commonly used for television distribution?
A. 25 Ω
B. 50 Ω
C. 75 Ω
D. 150 Ω
Answer: C. 75 Ω
Television and video systems commonly use 75-ohm coaxial cable.
