1
JEE Main 2018 (Online) 15th April Evening Slot
+4
-1 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 :
A
13482 kHz $$-$$ 13494 kHz
B
442 kHz $$-$$ 466 kHz
C
63 kHz $$-$$ 75 kHz
D
18 kHz $$-$$ 30 kHz
2
JEE Main 2018 (Online) 15th April Morning Slot
+4
-1 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 :
A
$$20$$
B
$$15$$
C
$$10$$
D
$$8$$
3
JEE Main 2017 (Online) 9th April Morning Slot
+4
-1
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 Peff will be given respectively as :

(K is a constant of proportionality)
A
$$\lambda$$, Peff = K $$\left( {{1 \over \lambda }} \right)$$2
B
$${{\lambda \over 8}}$$, Peff = K $$\left( {{1 \over \lambda }} \right)$$
C
$${{\lambda \over 16}}$$, Peff = K $$\left( {{1 \over \lambda }} \right)$$3
D
$${{\lambda \over 5}}$$, Peff = K $$\left( {{1 \over \lambda }} \right)$$$${\left( {{1 \over \lambda }} \right)^{{1 \over 2}}}$$
4
JEE Main 2017 (Online) 8th April Morning Slot
+4
-1 A signal of frequency 20 kHz and peak voltage of 5 Volt is used to modulate a carrier wave of frequency 1.2 MHz and peak voltage 25 Volts. Choose the correct statement.
A
Modulation index = 5, side frequency bands are at 1400 kHz and 1000 kHz
B
Modulation index = 5, side frequency bands are at 21.2 kHz and 18.8 kHz
C
Modulation index = 0.8, side frequency bands are at 1180 kHz and 1220 kHz
D
Modulation index = 0.2, side frequency bands are at 1220 kHz and 1180 kHz
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