JEE Main 2019 (Online) 9th April Evening Slot | Communication Systems Question 72 | Physics

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JEE Main 2019 (Online) 9th April Evening Slot

MCQ (Single Correct Answer)

-1

The physical sizes of the transmitter and receiver antenna in a communication system are :-

proportional to carrier frequency

inversely proportional to carrier frequency

inversely proportional to modulation frequency

independent of both carrier and modulation frequency

JEE Main 2019 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

A signal Acoswt is transmitted using v₀ sin $$\omega $$₀t as carrier wave. The correct amplitude modulated (AM) signal is

v₀ sin $$\omega $$₀t + Acos$$\omega $$t

(v₀ + A)cos$$\omega $$t sin$$\omega $$₀ t

v₀ sin[$$\omega $$₀ (1+ 0.01Asin$$\omega $$t)t]

$${v_0}\sin {\omega _0}t + {{\rm A} \over 2}\sin ({\omega _0} - \omega )t + {A \over 2}\sin ({\omega _0} + \omega )t$$

JEE Main 2019 (Online) 8th April Evening Slot

MCQ (Single Correct Answer)

-1

In a line of sight radio communication, a distance of about 50 km is kept between the transmitting and receiving antennas. If the height of the receiving antenna is 70m, then the minimum height of the transmitting antenna should be :
(Radius of the Earth = 6.4 × 10⁶ m).

40 m

20 m

51 m

32 m

JEE Main 2019 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

The wavelength of the carrier waves in a modern optical fiber communication network is close to :

1500 nm

2400 nm

600 nm

900 nm