JEE Main 2018 (Offline) | Communication Systems Question 89 | Physics

A telephonic communication service is working at carrier frequency of 10 GHz. Only 10% of it is utilized for transmission. How many telephonic channels can be transmitted simultaneously if each channel requires a bandwidth of 5 kHz ?

2 $$\times$$ 10⁶

2 $$\times$$ 10³

2 $$\times$$ 10⁵

2 $$\times$$ 10⁴

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MCQ (Single Correct Answer)

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Out of Syllabus

The carrier frequency of a transmitter is provided by a tank circuit of a coil of inductance 49 $$\mu $$H and a capacitance of 2.5 nF. It is modulated by an audio signal of $$12$$ $$kHz.$$ The frequency range occupied by the side bands is :

13482 kHz $$-$$ 13494 kHz

442 kHz $$-$$ 466 kHz

63 kHz $$-$$ 75 kHz

18 kHz $$-$$ 30 kHz

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MCQ (Single Correct Answer)

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Out of Syllabus

The number of amplitude modulted broadcast stations that can be accomodated in a $$300$$ $$kHz$$ band width for the highest modulating frequency $$15$$ $$kHz$$ will be :

$$20$$

$$15$$

$$10$$

$$8$$

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MCQ (Single Correct Answer)

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Out of Syllabus

A signal is to be transmitted through a wave of wavelength $$\lambda $$, using a linear antenna. The length l of the antenna and effective power radiated P_eff will be given respectively as :

(K is a constant of proportionality)

$$\lambda $$, P_eff = K $$\left( {{1 \over \lambda }} \right)$$²

$${{\lambda \over 8}}$$, P_eff = K $$\left( {{1 \over \lambda }} \right)$$

$${{\lambda \over 16}}$$, P_eff = K $$\left( {{1 \over \lambda }} \right)$$³

$${{\lambda \over 5}}$$, P_eff = K $$\left( {{1 \over \lambda }} \right)$$$${\left( {{1 \over \lambda }} \right)^{{1 \over 2}}}$$

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