Communication Systems - ECE Questions and Answers

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The number of possible colours with a 4 line digital input monitor are

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Convolution of x(t + 5) with impulse function δ(t - 7) is equal to

x(t - 2)

x(t + 12)

x(t - 12)

(t + 2)

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Which of the following is a better recording medium?

Ferric oxide

Ferrous oxide

Chromium di oxide

Either (a) or (b)

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An angle modulated signal is given by s(t) = cos 2p (2 x 10⁶t + 30 sin 150t + 40 cos 150t). The maximum frequency and phase deviations of s(t) are

10.5 kHz, 140p rad

6 kHz and 80p rad

10.5 kHz, 100p rad

7.5 kHz, 100p rad

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The PSD and the power of a signal g(t) are respectively S_g(ω) and P_g, the PSD and the power of signal a.g(t) are respectively

aS²_g (ω) and a²P_g

aS_g² (ω) and aP_g

aS_g (ω) and a²P_g

aS_g (ω) and aP_g

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In a 100% amplitude modulated signal, the power in the upper sideband when carrier power is to be 100 W and modulation system SSBSC, is

100 W

66 W

50 W

25 W

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The simplest method of suppression of unwanted side band in AM is

filter method

phase shift method

third method

both (a) and (b)

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For attenuation of low frequencies we should use

shunt capacitance

series capacitance

shunt inductance

series inductance

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Assertion (A): A colour TV uses a SAW filter to give stable band pass response and high gain.

Reason (R): Devices using SAW principle are used in many systems.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct