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GATE 2019: Communication Quiz 1 (App update required to attempt this test)

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Question 1

Consider an angle modulation signal x(t)= 10𝑐𝑜s [2𝜋 × 250 + 2 sin(400𝜋𝑡) + 4 cos(400𝜋𝑡)] V. The average power of x(t) is

Question 2

What would be the maximum and the minimum positive envelop of AM signal for career amplitude of 7V with modulation coefficient of 0.7?

Question 3

The antenna current of an AM broadcast transmitter modulated to a depth of 100% by an audio sine wave is which increases to due to simultaneous modulation by another audio sine wave. The modulation index due to second sine wave is________.

Question 4

In a AM signal, received signal power is with a maximum modulating signal of 5kHz.The noise spectral density at the receiver input is .If noise power is restricted to the message signal bandwidth only then signal-to-noise ratio at the input to the receiver is_______ (dB)

Question 5

A 70 kHz bandwidth is to accommodate 7 AM broadcast signals simultaneously. The maximum modulation frequency must each station be limited to _____ kHz. Assume that a guard band of 5 kHz is also present.

Question 6

for an angle modulated signal

The bandwidth is
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Sep 30ESE & GATE EC