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409.

When a plane wave traveling in free-space is incident normally on a medium having ε_r = 4.0 , the fraction of power transmitted into the medium is given by
[2 marks]
(A 8/9
(B) 1/2
(C) 1/3
(D) 5/6

asked in Electronics and Communication Engineering, 2006

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410.

A medium is divided into regions I and II about x = 0 plane, as shown in the figure below. An electromagnetic wave with electric field
, is incident normally on the interface form region-I. The electric field E₂ in region-II at the interface is:

[2 marks]

asked in Electronics and Communication Engineering, 2006

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411.

A medium of relative permittivity ε_r2 = 2 forms an interface with free-space. A point source of electromagnetic energy is located in the medium at a depth of 1 meter from the interface. Due to the total internal reflection, the transmitted beam has a circular cross-section over the interface. The area of the beam crosssection at the interface is given by [2 marks]
(A) 2πm²
(B) π²m²
(C) πm²/2
(D) πm²

asked in Electronics and Communication Engineering, 2006

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412.

A message signal with bandwidth 10 kHz is Lower-Side Band SSB modulated with carrier frequency f_c1 = 10⁶ Hz. The resulting signal is then passed through a Narrow-Band Frequency Modulator with carrier frequency f_c2 = 10⁹ Hz. The bandwidth of the output would be: [2 marks]
(A) 4 x 10⁴ Hz
(B) 2 x 10⁶ Hz
(C) 2 x 10⁹ Hz
(D) 2 x 10¹⁰ Hz

asked in Electronics and Communication Engineering, 2006

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413.

In the following figure the minimum value of the constant “C”, which is to be
added to y₁(t) such that y₁(t) and y₂(t) are different , is

[2 marks]
(A) Δ
(B) Δ/2
(C) Δ²/12
(D) Δ/L

asked in Electronics and Communication Engineering, 2006

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414.

The diagonal clipping in Amplitude Demodulation (using envelope detector) can be avoided if RC time-constant of the envelope detector satisfies the following condition, (here W is message bandwidth and ωc is carrier frequency both in rad/sec). [2 marks]
(A) RC < 1/W
(B) RC > 1/W
(C) RC < 1/ω_c
(D) RC > 1/ω_c

asked in Electronics and Communication Engineering, 2006

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