The audio signals of TV are : (1) Amplitude modulated (2) Frequency modulated (3) Unmodulated (4) Velocity modulated

The audio signals of TV are : (1) Amplitude modulated (2) Frequency modulated (3) Unmodulated (4) Velocity modulated
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(2) Frequency modulated Explanation: 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. In analogue television, the sound portion of a broadcast is invariably modulated separately from the video.  
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The audio signals of TV are – (1) Amplitude modulated (2) Frequency modulated (3) Unmodulated (4) Velocity modulated

Description : The audio signals of TV are – (1) Amplitude modulated (2) Frequency modulated (3) Unmodulated (4) Velocity modulated

Last Answer : (2) Frequency modulated Explanation: In analogue television, the sound portion of a broadcast is invariably modulated separately from the video. Most commonly, the audio and video are combined at ... visual antennas can be used. In almost all cases, standard wideband frequency modulation is used.

The audio signals of TV are (1) Amplitude modulated (2) Frequency modulated (3) Unmodulated (4) Velocity modulated

Description : The audio signals of TV are (1) Amplitude modulated (2) Frequency modulated (3) Unmodulated (4) Velocity modulated

Last Answer : Frequency modulated

In amplitude modulation technique the unmodulated carrier is referred to as having ______. A. 100% modulation B. 0% modulation C. 50% modulated D. Over modulated

Description : In amplitude modulation technique the unmodulated carrier is referred to as having ______. A. 100% modulation B. 0% modulation C. 50% modulated D. Over modulated

Last Answer : B. 0% modulation

A modulation which does not follow the sine wave pattern, it produces undesirable harmonics such as spurious emission A. 0% modulated B. Over-modulated C. Unmodulated D. 100% modulated

Description : A modulation which does not follow the sine wave pattern, it produces undesirable harmonics such as spurious emission A. 0% modulated B. Over-modulated C. Unmodulated D. 100% modulated

Last Answer : B. Over-modulated

A transmitter supplies 8 kW to the antenna when it is unmodulated, determine the total radiated power when modulated at 90%. A. 5 kW B. 20 kW C. 15 kW D. 8.36 kW

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In FM, frequency of modulated wave varies with A. amplitude B. time C. wavelength D. energy

Description : In FM, frequency of modulated wave varies with A. amplitude B. time C. wavelength D. energy

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In frequency modulation, amplitude of modulated wave is A. positive B. negative C. constant D. zero

Description : In frequency modulation, amplitude of modulated wave is A. positive B. negative C. constant D. zero

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Amplitude of modulated wave is in phase with A. output B. system C. frequency D. signal

Description : Amplitude of modulated wave is in phase with A. output B. system C. frequency D. signal

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A 1 Mhz carrier is amplitude modulated by a pure 200-Hz audio test tone. Which of the following combinations of frequencies represent the total content of the AM signal? A. 1 MHz and 200 Hz B. 1 MHz and 1000.2 kHz C. 999.8 kHz, 1000 kHz, and 1000.2 kHz D. 999.8 kHz and 1000.2 kHz

Description : A 1 Mhz carrier is amplitude modulated by a pure 200-Hz audio test tone. Which of the following combinations of frequencies represent the total content of the AM signal? A. 1 MHz and 200 Hz B. 1 MHz and 1000.2 kHz C. 999.8 kHz, 1000 kHz, and 1000.2 kHz D. 999.8 kHz and 1000.2 kHz

Last Answer : C. 999.8 kHz, 1000 kHz, and 1000.2 kHz

What is the effect in over modulated amplitude modulated radio broadcasting transmission? A. Interference to adjacent channel B. Higher fidelity C. Increase noise D. Higher audio signal

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Draw amplitude modulated waveform in time domain and frequency domain with proper labeling.

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Description : A 4 GHz carrier is amplitude modulated by a low-pass signal of maximum cut off frequency 1 MHz. lf this signal is to be ideally sampled, the minimum sampling frequency should be nearly

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What is meant by the term modulation index? A. The processor index. B. The ratio between the deviation of a frequency modulated signal and the modulating frequency. C. The FM signal-to-noise ratio. D. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency.

Description : What is meant by the term modulation index? A. The processor index. B. The ratio between the deviation of a frequency modulated signal and the modulating frequency. C. The FM signal-to-noise ratio. D. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency.

Last Answer : B. The ratio between the deviation of a frequency modulated signal and the modulating frequency.

The ratio of the level of the modulated output of a transmitter under conditions of standard test modulation to the level of the demodulated output with no modulation applied both measured with the same bandwidth. A. Reference audio output B. None of these C. Audio frequency response D. Residual noise level

Description : The ratio of the level of the modulated output of a transmitter under conditions of standard test modulation to the level of the demodulated output with no modulation applied both measured with the ... . Reference audio output B. None of these C. Audio frequency response D. Residual noise level

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ECE Board Exam March 1996 What is the purpose of a beat frequency oscillator (BFO)? A. Aid in the reception of weak voice-modulated signals B. Generates a signal, whose frequency is the same as that of the intermediate frequency C. Generates a 1kHz note for Morse code reception D. Generates an output, whose frequency differs from that of the intermediate frequency by 1 kHz

Description : ECE Board Exam March 1996 What is the purpose of a beat frequency oscillator (BFO)? A. Aid in the reception of weak voice-modulated signals B. Generates a signal, whose frequency is the ... reception D. Generates an output, whose frequency differs from that of the intermediate frequency by 1 kHz

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Quality of a musical note depends on – (1) Fundamental frequency (2) Amplitude of the wave (3) Harmonics present (4) Velocity of sound in the medium

Description : Quality of a musical note depends on – (1) Fundamental frequency (2) Amplitude of the wave (3) Harmonics present (4) Velocity of sound in the medium

Last Answer : (3) Harmonics present Explanation: Sound "quality" or "timbre" describes those characteristics of sound which allow the ear to distinguish sounds which have the same pitch and loudness. Timbre is mainly ... and the attack-decay envelope of the sound. Harmonic content is the most important of these.

Of the following properties of a wave, the one that is independent of the other is its (1) amplitude (2) velocity (3) wavelength (4) frequency

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Last Answer : (1) amplitude Explanation: The maximum extent of a vibration or oscillation, measured from the position of equilibrium.

The pitch of sound depends on its – (1) Frequency (2) Intensity (3) Velocity (4) Amplitude

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When a light wave is reflected from a mirror, there is a change in its – (1) frequency (2) amplitude (3) wavelength (4) velocity

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Of the following properties of a wave, the one that is independent of the other is its (1) amplitude (2) velocity (3) wavelength (4) frequency

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What is colour of light related to ? (1) Amplitude (2) Frequency (3) Quality (4) Velocity

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A 1000W carrier is amplitude modulated to a depth of 85%. Calculate the total power of the modulated wave? A. 1361.25 W B. 680.62 W C. 1425 W D. 712.5 W

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A 400 W carrier is amplitude modulated to a depth of 75%.Calculate the total power in AM wave. (i) Explain the types of noise in a communication system. (ii) Compare simplex and duplex mode of communication.

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Last Answer : (i) Noise: Noise is any spurious or undesired disturbances that mask the received signal in a communication system. a) Atmospheric Noise: Atmospheric Noise is also known as static noise which is the ... remote control ExamplesWalkytalky,telephone,mobile,Radar, FAX,Pager 4

In a microwave test bench, why is the microwave signal amplitude modulated at 1 kHz?

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The absolute value of a signal's highest intensity is called………. A. Peak Amplitude B. Frequency C. Phase D. Both a and c

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Last Answer : if you’re curious as to what that is, check it out it’s not so much building it that will be a problem, it’s finding to materials.

Why can phase-modulated signals be detected by fm detectors?

Description : Why can phase-modulated signals be detected by fm detectors?

Last Answer : Because of the incidental frequency shift that is caused while phase-shifting a carrier wave that is similar to fm modulation.

A system where the modulated RF picture and sound carrier signals are distributed in a cable network, instead of wireless system.

Description : A system where the modulated RF picture and sound carrier signals are distributed in a cable network, instead of wireless system.

Last Answer : CATV

Which of the two types of magnetic tape is used to record audio and instrumentation type signals in the VLF to 2.5MHz frequency range?

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The maximum velocity of a body in SHM with amplitude of 150 mm and a frequency 2 vibrations/sec is equal to a.1.885 m/sec b.0.01885 m/sec c.0.1885 m/sec d.18.55 m/sec e.185.5 m/sec

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Last Answer : a. 1.885 m/sec

Of the following properties of a wave, the one that is independent of the other is its (a) Amplitude (b) Velocity (c) Wavelength (d) Frequency

Description : Of the following properties of a wave, the one that is independent of the other is its (a) Amplitude (b) Velocity (c) Wavelength (d) Frequency

Last Answer : Ans:(a)