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325.

An output of a communication channel is a random variable v with the probability density function as shown in figure. The mean square value of v is

[2 marks]
(a) 4
(b) 6
(c) 8
(d) 9

asked in Electronics and Communication Engineering, 2005

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326.

A carrier is phase modulated (PM) with frequency deviation of 10 kHz by a single tone frequency of 1 kHz. If the single tone frequency is increased to 2 kHz, assuming that phase deviation remains unchanged, the bandwidth of the PM signal is [2 marks]
(a) 21 kHz
(b) 22 kHz
(c) 42 kHz
(d) 44 kHz

asked in Electronics and Communication Engineering, 2005

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327.

Noise with uniform power spectral density of N₀ W/Hz is passed through a filter H(ω)=2exp(-jωtd) followed by an ideal low pass filter of bandwidth B Hz. The output noise power in Watts is [2 marks]
(a) 2N_oB
(b) 4N_oB
(c) 8N_oB
(d) 16N_oB

asked in Electronics and Communication Engineering, 2005

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328.

A signal as shown in figure is applied to a matched filter. Which of the following does represent the output of this matched filter? [2 marks]

asked in Electronics and Communication Engineering, 2005

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329.

A device with input x(t) and output y(t) is characterized by: y(t) = x²(t) .An FM signal with frequency deviation of 90 kHz and modulating signal bandwidth of 5 kHz is applied to this device. The bandwidth of the output signal is
[2 marks]
(a) 370 kHz
(b) 190 kHz
(c) 380 kHz
(d) 95 kHz

asked in Electronics and Communication Engineering, 2005

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330.

A MOS capacitor made using p type substrate is in the accumulation mode. The dominant charge in the channel is due to the presence of
[2 marks]
(a) holes
(b) electrons
(c) positively charged ions
(d) negatively charged ions

asked in Electronics and Communication Engineering, 2005

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