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1
JEE Main 2021 (Online) 27th July Evening Shift
Numerical
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The maximum amplitude for an amplitude modulated wave is found to be 12V while the minimum amplitude is found to be 3V. The modulation index is 0.6x where x is ____________.
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2
JEE Main 2021 (Online) 27th July Morning Shift
Numerical
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-1
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The amplitude of upper and lower side bands of A.M. wave where a carrier signal with frequency 11.21 MHz, peak voltage 15 V is amplitude modulated by a 7.7 kHz sine wave of 5V amplitude are $${a \over {10}}V$$ and $${b \over {10}}V$$ respectively. Then the value of $${a \over b}$$ is ____________.
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3
JEE Main 2021 (Online) 25th July Evening Shift
Numerical
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A message signal of frequency 20 kHz and peak voltage of 20 volt is used to modulate a carrier wave of frequency 1 MHz and peak voltage of 20 volt. The modulation index will be :
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4
JEE Main 2021 (Online) 20th July Morning Shift
Numerical
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-1
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A carrier wave Vc(t) = 160 sin(2$$\pi$$ $$\times$$ 106t) volts is made to vary between Vmax = 200 V and Vmin = 120 V by a message
signal Vm(t) = Am sin(2$$\pi$$ $$\times$$ 103t) volts. The peak voltage Am of the modulating signal is ___________.
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