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SECTION 8 Not-for-Profit Company
80G & 12A Income Tax Exempted
NGO DARPAN Govt. Registered
LICENSED HAM CLUB Callsign: VU2TPW
SUSTAINABLE DEVELOPMENT Aligned with UN SDGs
SAFE INDIA • STRONG INDIA • RESILIENT INDIA
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Technical Electronics 5 Questions • 70% Pass Mark

Radio Electronics & HF/VHF Propagation

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Candidate Certificate Name: Your name will appear on the digital certificate upon scoring 70%+.
1
According to Ohm’s Law, what is the relationship between Voltage (V), Current (I), and Resistance (R)?
Key Insight: Ohm’s law states that voltage is the product of current in amperes multiplied by resistance in ohms.
2
What does a high Standing Wave Ratio (SWR > 3:1) on an antenna system indicate?
Key Insight: High SWR indicates reflected RF power that cannot radiate into the air and returns to overheat the transmitter amplifier.
3
What atmospheric layer reflects High Frequency (HF) radio waves back to Earth, enabling global long-distance skywave communication?
Key Insight: Ionized layers (E and F) in the upper atmosphere refract HF radio signals over the horizon around the globe.
4
What is the standard impedance of most coaxial transmission cables and amateur radio antennas?
Key Insight: 50 Ohms is the universal standard impedance for commercial and amateur radio transceivers and coaxial feeds.
5
What is the physical length of a resonant Half-Wave Dipole antenna for the 40-Meter (7 MHz) HF band approximately?
Key Insight: A half-wave dipole is half of the wavelength (40m / 2 = 20 meters total, divided into two 10-meter quarter-wave legs).
Answer all 5 questions to submit.

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DCTIAH KB INDIA FOUNDATION

Incorporated under Section 8 of the Companies Act, 2013 • CIN: U85500TN2025NPL186348
Recognized by Govt. of India • NITI Aayog NGO-DARPAN • Wireless Net VU2TPW

OFFICIAL DIGITAL CREDENTIAL

CERTIFICATE OF AWARENESS & EXCELLENCE

NATIONAL DISASTER RESILIENCE & WIRELESS KNOWLEDGE MISSION

This is to proudly certify that

AWARENESS CHAMPION

has demonstrated outstanding proficiency, dedication, and knowledge by successfully completing the specialized examination in Radio Electronics & HF/VHF Propagation with distinction, upholding the highest standards of safety, disaster risk reduction, and emergency community preparedness.

Dr. K. Balasubramanian
Director of Academic Board DCTIAH KB INDIA FOUNDATION
VERIFIED & AUTHENTICATED ★ 2026 ★
Authorized Registrar
General Secretary / Registrar National Certification Cell
Certificate ID: DCTIAH-QZ-2026-948172
Date of Issue: 25 August 2026
Verify at: dctiahkbfoundation.org/verify
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