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10 Maths Exercise Solutions

A transmitting antenna at the top of a tower has a height and the height of the receiving antenna is . What is the maximum distance between them for satisfactory communication in mode? Given radius of earth .

A message signal of frequency and peak voltage of is used to modulate a carrier of frequency and peak voltage of . Determine modulation index and the side bands produced.

Which of the following frequencies will be suitable for beyond-the horizon communication using sky waves?（ ）

A.

B.

C.

D.

Frequencies in the UHF range normally propagate by means of: （ ）

A. Ground waves.

B. Sky waves.

C. Surface waves.

D. Space waves.

Digital signals

do not provide a continuous set of values,

represent values as discrete steps,

can utilize binary system, and

can utilize decimal as well as binary systems.

Which of the above statements are true?

& only

& only

& but not

all of &

do not provide a continuous set of values,

represent values as discrete steps,

can utilize binary system, and

can utilize decimal as well as binary systems.

Which of the above statements are true?

& only

& only

& but not

all of &

Is it necessary for a transmitting antenna to be at the same height as that of the receiving antenna for line of sight communication? A TV transmitting antenna is tall. How much service area can it cover if the receiving antenna is at the ground level?

Why are and are preferred materials for solar cells?

A modulating signal is a square wave, as shown in figure,

The carrier wave is given by

Sketch the amplitude modulated waveform

What is the modulation index?

The carrier wave is given by

Sketch the amplitude modulated waveform

What is the modulation index?

For an amplitude modulated wave, the maximum amplitude is found to be while the minimum amplitude is found to be . Determine the modulation index, .

What would be the value of if the minimum amplitude is zero volt?

What would be the value of if the minimum amplitude is zero volt?

Due to economic reasons, only the upper sideband of an wave is transmitted, but at the receiving station, there is a facility for generating the carrier. Show that if a device is available which can multiply two signals, then it is possible to recover the modulating signal at the receiver station.

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