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Recent questions tagged ch15

In which of the following remote sensing technique is not used

asked Mar 17, 2014 by sreemathi.v

1 answer

An oscillator is producing FM waves of frequency 3KHz with a variation of 9KHz what is the modulating index

asked Mar 17, 2014 by sreemathi.v

1 answer

A carrier wave is modulated to 75%.If the power of carrier wave is 500W what is power of modulated wave

asked Mar 17, 2014 by sreemathi.v

1 answer

An audio frequency of $4\times 10^3$Hz is used to modulate a carrier wave of frequency 1MHz.The band width is

asked Mar 17, 2014 by sreemathi.v

1 answer

A amplitude modulated wave has maximum amplitude of 700mV and minimum amplitude of 200mV.Calculate the modulation factor

asked Mar 17, 2014 by sreemathi.v

1 answer

A TV tower has a height of 100m.If the coverage range is to be made three times then by how much should the height of the tower be increased.

asked Mar 17, 2014 by sreemathi.v

1 answer

A AM broadcasting station has a vertical telescopic transmitting antenna and a receiver has vertical telescopic antenna.The receiver will respond to

asked Mar 14, 2014 by sreemathi.v

1 answer

SKIP ZONE in radio wave transmission is that range where

asked Mar 14, 2014 by sreemathi.v

1 answer

Which of the following is not an advantage of FM over AM

asked Mar 14, 2014 by sreemathi.v

1 answer

Which of the following frequency will be suitable for beyond the horizon communication using sky waves?

asked Mar 14, 2014 by sreemathi.v

1 answer

Frequencies in the UHF range are normally propagated by means of

asked Mar 14, 2014 by sreemathi.v

1 answer

Over modulation results in

asked Mar 14, 2014 by sreemathi.v

1 answer

In AM wave useful power is carried by

asked Mar 14, 2014 by sreemathi.v

1 answer

Nature of analog signal is

asked Mar 14, 2014 by sreemathi.v

1 answer

The length of half wave dipole antenna needed for a 200MHz signal is

asked Mar 14, 2014 by sreemathi.v

1 answer

The maximum distance upto which TV transmission from a TV tower of height 'h' can be received is proportional to

asked Mar 14, 2014 by sreemathi.v

1 answer

Which of the following is/are false?

asked Mar 14, 2014 by sreemathi.v

1 answer

In amplitude modulation,the band width is

asked Mar 14, 2014 by sreemathi.v

1 answer

The main purpose of modulation is to

asked Mar 14, 2014 by sreemathi.v

2 answers

S1: The ground waves can bend round the corners of the objects on earth. \[\] S2: The ground wave propagation can be used for very large distance propagation.

asked Mar 5, 2014 by thanvigandhi_1

1 answer

S1: Shielding is required around high energy particle accelerators and high voltage power supplies in T.V. sets \[\] S2: Every accelerated charge particles radiate electromagnetic radiations

asked Mar 5, 2014 by thanvigandhi_1

1 answer

S1: Electromagnetic waves with frequencies more than the critical frequency of ionosphere cannot be used for communication using sky wave communication. \[\] S2: The refractive index of ionosphere becomes very high for frequencies higher than the critical frequency.

asked Mar 5, 2014 by thanvigandhi_1

1 answer

A TV tower has a height of $100\: m$. The area covered by the TV broadcast, if radius of the earth is $6400\: km$, will be:

asked Feb 28, 2014 by thanvigandhi_1

1 answer

The AM radio wave bends appreciably round the corners of a $1m \times 1m$ board but the FM wave only negligibly bands. If the average wavelength of the AM and FM waves are $ \lambda_a$ and $\lambda_f$ , then

asked Feb 28, 2014 by thanvigandhi_1

1 answer

The displacement $y$ of a particle in a medium can be expressed as $y = 10^{-6} \sin \bigg(100t + 20x + \large\frac{\pi}{4}\bigg)m$, where $t$ is in second and $x$ is in metre. The speed of the wave is

asked Feb 28, 2014 by thanvigandhi_1

1 answer

A wave travelling along the $x$ - axis is described by the equation $y(x,t) = 0.005\: \cos(\alpha x - \beta t)$. If the wavelength and time period of the wave are $0.08 \: m $ and $2\: s$, respectively, then $ \alpha$ and $ \beta$ in appropriate units are

asked Feb 28, 2014 by thanvigandhi_1

1 answer

The displacement $y$ of a wave travelling in the $x$ - direction is $y = 10^{-4} \sin(600t – 2x + \large\frac{\pi}{3})m$, where, $x$ is in $m$ and $t$ is in $s$. The speed of the wave motion in $m/s$ is

asked Feb 27, 2014 by thanvigandhi_1

1 answer

$UHF$ range if electromagnetic waves can be propagated by means of

asked Feb 26, 2014 by thanvigandhi_1

1 answer

For television broadcasting, the frequency employed is normally

asked Feb 25, 2014 by thanvigandhi_1

1 answer

Long distance short-wave radio broadcasting uses

asked Feb 25, 2014 by thanvigandhi_1

1 answer

The process of superimposing signal frequency (i.e, audio wave) on the carrier wave is known as

asked Feb 25, 2014 by thanvigandhi_1

1 answer

The attenuation in optical fibre is mainly due to

asked Feb 25, 2014 by thanvigandhi_1

1 answer

The electromagnetic waves of frequency $2\: MHz\: to\: 30\: MHz$ are:

asked Feb 25, 2014 by thanvigandhi_1

1 answer

The radio frequency $300\: MHz$ to $3000 \: MHz$ belong to:

asked Feb 25, 2014 by thanvigandhi_1

1 answer

An antenna is a device:

asked Feb 25, 2014 by thanvigandhi_1

1 answer

Which of the following is the disadvantage of FM over AM?

asked Feb 25, 2014 by thanvigandhi_1

1 answer

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