Test: Modulation And Detection Of Signals

10 Questions MCQ Test Physics Class 12 | Test: Modulation And Detection Of Signals

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What does the abbreviation WWW mean in communication?


The abbreviation WWW means world wide web in communication.


The process of impressing any information by changing the original signal is called


The process of impressing information by changing the original signal is called ‘modulation’, and it is done in a variety of ways. In all cases the radio waves simply act as a vehicle for the information, so they are commonly called ‘carrier waves’.


Attenuation of a signal is


Attenuation is a general term that refers to any reduction in the strength of a signal. Attenuation occurs with any type of signal, whether digital or analog. Sometimes called loss, attenuation is a natural consequence of signal transmission over long distances.


Repeater stations are used to


A repeater is an automated radio station that extends the range of communications.To use a repeater, a user's radio is configured to receive on the repeater's transmitting frequency, and when the push-to-talk button is pressed, transmit on the repeater's receiving frequency.


Type of modulation used for continuous and sinusoidal wave is


Amplitude modulation, Frequency modulation and Phase modulation are used for the carrier wave which is a continuous wave whereas Pulse amplitude modulation, Pulse width modulation and Pulse position modulation is used if the wave is not a continuous one and is in the form of pulses.


The limiting values of modulation index (μ) of an AM wave is​


For maximum value modulation index can be greater than 1 or it can take any value depending on the amount of carrier present in the overall modulated signal. Maximum value of modulation index in 1. Above 1 over modulation occurs which cause distortion of signal. Minimum value is 0.


The waveform of information, which is being impressed upon the carrier wave, is called the.


In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted.


A message of frequency 5 kHz and peak voltage of 2 V is used to modulate a carrier wave of frequency 2 MHz and a peak voltage of 10 V. The modulation index is​


Given, peak voltage of the carrier signal is Vc​=10V and 
 peak voltage of the modulated signal is Vm​=2×1=2V (as peak voltage =2× amplitude of voltage)
Modulation index is defined as, μ= Vm /Vc​​=2/10=0.0.2


What happens to the power in a FM signal as the modulation index increases?


Power remains constant irrespective of the modulation index in case of F.M. signal.


Which of the following is not a valid option for modulation of waves?


Velocity modulation is then defined as that variation in the velocity of a beam of electrons caused by the alternate speeding up and slowing down of the electrons in the beam. This variation is usually caused by a voltage signal applied between the grids through which the beam must pass.