Consider a loss less antenna with a directive gain of + 6 dB. If 1 mW of power i

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Question
Consider a loss less antenna with a directive gain of + 6 dB. If 1 mW of power is fed to it the total power radiated by the antenna will be
Options
A. 4 mW
B. 1 mW
C. 7 mW
D. 1/4 mW

Correct Answer

4 mW

Explanation

6 dB = 10 log₁₀

Consider a loss less antenna with a directive gain of + 6 dB. If 1 mW of power is fed to it the tota

⟹ Consider a loss less antenna with a directive gain of + 6 dB. If 1 mW of power is fed to it the tota = 10^0.6 ⟹ 3.98

P_r = 3.98 mW.

Electromagnetic Field Theory problems

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1. Most antenna consisting of a 50 meter long vertical conductor operates over a perfectly conducting ground plane. It is base fed at a frequency of 600 kHz. The radiation resistance of the antenna in ohms is
Options
A.
B.
C.
D. 20p²

2. Which one of the following potential does not satisfy Laplace's equations?
Options
A. v = 10 xy
B. v = p cos ?
C.
D. v = f cos ? + 10

4. The electric field on the surface of a perfect conductor is 2V/m. The conductor is immersed in water with ? = 80 ?₀. The surface charge density on the conductor is ((?₀ = 10^-9/36p)F/m)
Options
A. 0 c/m²
B. 2 c/m²
C. 1.8 x 10^-11 c/m²
D. 1.14 x 10^-9 c/m²

5. The electric field of the incident wave is , where ? = 3 x 10⁹p and ? = 10 p. The electric field of the transmitted wave E_t is given by
Options
A.
B.
C.
D.

7. A transmission line is feeding 1 watt of power to a horn antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free space is
Options
A. 10 watts
B. 1 watt
C. 0.1 watt
D. 0.01 watt

9. In a conductor which of the following relations hold good?
Options
A. ? x D = r
B. ? . D = r
C. ? x D = 0
D. ? . D = 0

10. A rectangular waveguide measures 3 x 4.5 cm internally and has a 10 GHz signal propagated in it. Calculate the wave impedance for dominant mode.
Options
A. 130 p
B. 1.3 p
C. 120 p
D. 12 p

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