MCQs on Analog And Digital Communication

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01․ FM stands for
frequent modulation.
frequency modulation.
frequency moderator.
frequent moderator.

In telecommunications and signal processing, frequency modulation (FM) conveys information over a carrier wave by varying its instantaneous frequency. This contrasts with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant.

02․ Purely mechanical instrument cannot be used for dynamic measurements because they have
high inertia.
higher response time.
large time constant.
all of the above.

Mechanical instruments are unable to response rapidly to the measurement of dynamic conditions due to the fact that they have moving parts that are rigid, heavy and bulky and consequently have a large mass and they take large response time. Mass presents inertia problems and hence these instrument can not faithfully follow the rapid changes which are involved in dynamic instrument.

03․ Speed of data transmission in 4-G network of telecom is
386 kbps - 2 mbps.
2 mbps.
2 mbps – 1 gbps.
100 mbps - 1 gbps.

Speed of data transmission in 4G network of telecom is from 100 mbps to 1 gbps.

04․ A sinusoidal signal is analog signal, because
it can have a number of values between the negative and positive peaks
it is negative for one half cycle
it is positive for one half cycle
it has positive as well as negative values

Analog signal is a continuous signal and digital signal is a discrete signal. A sinusoidal signal is a continuous signal with respect to time. Therefore, sinusoidal signal is a analog signal.

05․ In electronic communications, "AM" stands for
Amp Modification
Amplitude Method
Amplitude Modulation
Ampere Method

AM was the earliest modulation method used to transmit voice by radio. It was developed during the first quarter of the 20th century beginning with Landell de Moura and Reginald Fessenden's radiotelephone experiments in 1900.