📝 Unguided media: Microwaves

📖 From Data Communication & Networks • 7. Transmission Media • 17 questions available

Practice MCQs for Unguided media: Microwaves. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-31

Easy Questions

Medium Questions

Hard Questions

📝 Sample Questions

Q1. What frequency range is commonly used for microwave communication in data networks?

🔹 A. 1–10 GHz

🔹 B. 30–300 GHz

🔹 C. 300 MHz–3 GHz

🔹 D. 3–30 GHz

💡 Difficulty: easy | ✅ Correct: B

Q2. A microwave link suffers a 3 dB increase in path loss due to rain fade. How does this affect the received power?

🔹 A. Power halves

🔹 B. Power doubles

🔹 C. No change

🔹 D. Power reduces by 3 dB

💡 Difficulty: medium | ✅ Correct: A

Q3. A microwave link is planned between two towers 40 km apart at 15 GHz. Given a free‑space path loss of \(L = 20\log_{10}(4\pi d f /c)\), calculate the path loss and determine if a 30 dBi transmit antenna and 35 dBi receive antenna with 20 W transmit power can achieve a received power above –80 dBm. Assume system losses of 2 dB.

🔹 A. Path loss ≈ 112 dB, received ≈ –70 dBm (OK)

🔹 B. Path loss ≈ 120 dB, received ≈ –78 dBm (OK)

🔹 C. Path loss ≈ 112 dB, received ≈ –84 dBm (Not OK)

🔹 D. Path loss ≈ 120 dB, received ≈ –90 dBm (Not OK)

💡 Difficulty: hard | ✅ Correct: B

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🔗 Related Topics

📝 Introduction to Transmission Media in Physical Layer 📝 Guided media: Twisted Pair Cable 📝 Guided media: Coaxial Cable 📝 Guided media: Fiber Optic Cable 📝 Unguided media: Wireless

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