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565.

Noise with double-sided power spectral density of K over all frequencies is passed through a RC low pass filter with 3dB cut-off frequency of f_c. The noise power at the filter output is [2 marks]
(A) K
(B) Kf_c
(C) Kπf_c
(D) ∞

last reply by CpjJwWHV • 13 years ago • asked in Electronics and Communication Engineering, 2008

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566.

At 20GHz, the gain of a parabolic dish antenna of 1 meter diameter and 70% efficiency is [2 marks]
(A) 15dB
(B) 25dB
(C) 35dB
(D) 45dB

asked in Electronics and Communication Engineering, 2008

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567.

In the design of a single mode step index optical fiber close to upper cut-off, the single mode operations is NOT preserved if [2 marks]
(A) Radius as well as operating wavelength are halved
(B) Radius as well as operating wavelength are doubled
(C) Radius is halved and operating wavelength is doubled
(D) Radius is doubled and operating wavelength is halved

asked in Electronics and Communication Engineering, 2008

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568.

A uniform plane wave in the free space is normally incident on an infinitely thick dielectric slab (dielectric constant ε_r = 9 ). The magnitude of the reflection coefficient is [2 marks]
(A) 0
(B) 0.3
(C) 0.5
(D) 0.8

asked in Electronics and Communication Engineering, 2008

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569.

One of a loss-less transmission line having the characteristic impedance of 75Ω and length of 1cm is short-circuited. At 3GHz, the input impedance at the other end of the transmission line is [2 marks]
(A) 0
(B) Resistive
(C) Capacitive
(D) Inductive

asked in Electronics and Communication Engineering, 2008

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570.

A rectangular waveguide of internal dimensions (a = 4cm and b = 3) is to be operated in TE₁₁ mode. The minimum operating frequency is [2 marks]
(A) 6.25GHz
(B) 6.0GHz
(C) 5.0GHz
(D) 3.75GHz

asked in Electronics and Communication Engineering, 2008

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