Which region of the ionosphere is mainly responsible for long distance night time communication? A. A layer B. D layer C. E layer D. F layer

Which region of the ionosphere is mainly responsible for long distance night time
communication?
A. A layer
B. D layer
C. E layer
D. F layer
by

1 Answer

Answer :

D. F layer
by

Related questions

A radio communications link is to be established via the ionosphere. The maximum virtual height of the layer is 100 km at the midpoint of the path and the critical frequency is 2 MHz. The distance between stations is 600 km. determine the optimum working frequency? A. 6.32 MHz B. 2.1 MHz C. 5.4 MHz D. 1.8 MHz

Description : A radio communications link is to be established via the ionosphere. The maximum virtual height of the layer is 100 km at the midpoint of the path and the critical frequency is 2 MHz. The distance between stations is 600 ... optimum working frequency? A. 6.32 MHz B. 2.1 MHz C. 5.4 MHz D. 1.8 MHz

Last Answer : C. 5.4 MHz

What is the thickest layer of the ionosphere? A. E B. F1 C. F2 D. D

Description : What is the thickest layer of the ionosphere? A. E B. F1 C. F2 D. D

Last Answer : C. F2

ECE Board Exam March 1996 The lowest layer in the ionosphere A. D B. F2 C. E D. F1

Description : ECE Board Exam March 1996 The lowest layer in the ionosphere A. D B. F2 C. E D. F1

Last Answer : A. D

Which of the following layers of the ionosphere has no effect on sky wave propagation during daytime? A. D B. E C. F1 D. F2

Description : Which of the following layers of the ionosphere has no effect on sky wave propagation during daytime? A. D B. E C. F1 D. F2

Last Answer : A. D

Which if the following layers of the ionosphere has no effect on sky wave propagation during the hours of darkness? A. D B. E C. F1 D. F2

Description : Which if the following layers of the ionosphere has no effect on sky wave propagation during the hours of darkness? A. D B. E C. F1 D. F2

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What is a selective fading effect? A. A fading effect caused by small changes in beam heading at the receiving station. B. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station. C. A fading effect caused by large changes in the height of the ionosphere, as experienced at the receiving station D. A fading effect caused by time differences between the receiving and transmitting stations.

Description : What is a selective fading effect? A. A fading effect caused by small changes in beam heading at the receiving station. B. A fading effect caused by phase differences between radio wave ... station D. A fading effect caused by time differences between the receiving and transmitting stations.

Last Answer : B. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station.

What is the major cause of selective fading? A. Small changes in the beam heading at the receiving station. B. Large changes in the height of the ionosphere, as experience at the receiving station. C. Time differences between the receiving and transmitting stations. D. Phase differences between radio wave components of the same transmission, as experienced at the receiving station.

Description : What is the major cause of selective fading? A. Small changes in the beam heading at the receiving station. B. Large changes in the height of the ionosphere, as experience at the ... Phase differences between radio wave components of the same transmission, as experienced at the receiving station.

Last Answer : D. Phase differences between radio wave components of the same transmission, as experienced at the receiving station.

Refers to an effect of selective fading. A. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station. B. A fading effect caused by small changes in beam heading at the receiving station. C. A fading effect caused by the time differences between the receiving and transmitting stations. D. A fading effect caused by large changes in the height of the ionosphere, as experienced at the receiving station.

Description : Refers to an effect of selective fading. A. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station. B. A fading ... caused by large changes in the height of the ionosphere, as experienced at the receiving station.

Last Answer : A. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station.

Who is responsible in the correctness and accuracy of transmitted information content over a data communication? A. The channel B. The transmitter and receiver C. The modem D. The bridge

Description : Who is responsible in the correctness and accuracy of transmitted information content over a data communication? A. The channel B. The transmitter and receiver C. The modem D. The bridge

Last Answer : B. The transmitter and receiver

The rhombic antenna is primarily used for A. ground wave propagation B. space wave propagation C. ionosphere scatter propagation D. sky wave propagation

Description : The rhombic antenna is primarily used for A. ground wave propagation B. space wave propagation C. ionosphere scatter propagation D. sky wave propagation

Last Answer : D. sky wave propagation

Where is the noise generated that primarily determines the signal-to-noise ratio in a VHF (150MHz) marine-band receiver? A. Man-made noise B. In the atmosphere C. In the receiver front end D. In the ionosphere

Description : Where is the noise generated that primarily determines the signal-to-noise ratio in a VHF (150MHz) marine-band receiver? A. Man-made noise B. In the atmosphere C. In the receiver front end D. In the ionosphere

Last Answer : C. In the receiver front end

What causes the maximum usable frequency to vary? A. The temperature of the ionosphere B. The speed of the winds in the upper atmosphere C. The type of weather just below the ionosphere D. The amount of radiation received from the sun

Description : What causes the maximum usable frequency to vary? A. The temperature of the ionosphere B. The speed of the winds in the upper atmosphere C. The type of weather just below the ionosphere D. The amount of radiation received from the sun

Last Answer : D. The amount of radiation received from the sun

What instrument normally measures the virtual height of ionosphere? A. Ionosonde B. Altimeter C. Field meter D. Radar

Description : What instrument normally measures the virtual height of ionosphere? A. Ionosonde B. Altimeter C. Field meter D. Radar

Last Answer : A. Ionosonde

When the is the ionosphere most ionized? A. Dusk B. Midnight C. Dawn D. Midday

Description : When the is the ionosphere most ionized? A. Dusk B. Midnight C. Dawn D. Midday

Last Answer : D. Midday

Where is the noise generated that primarily determines the signal-to-noise ratio in a VHF (150 MHz) marine-band receiver? A. In the ionosphere B. In the receiver rear end C. In the receiver front end D. In the atmosphere

Description : Where is the noise generated that primarily determines the signal-to-noise ratio in a VHF (150 MHz) marine-band receiver? A. In the ionosphere B. In the receiver rear end C. In the receiver front end D. In the atmosphere

Last Answer : C. In the receiver front end

What phenomenon causes the radio-path horizon distance to exceed the geometric horizon? A. E-layer skip. B. D-layer skip. C. Auroral skip. D. Radio waves may be bent.

Description : What phenomenon causes the radio-path horizon distance to exceed the geometric horizon? A. E-layer skip. B. D-layer skip. C. Auroral skip. D. Radio waves may be bent.

Last Answer : D. Radio waves may be bent.

During the night when the F2 layer combines with F1 layer it falls to what approximate height? A. 250 km B. 350 km C. 300 km D. 400 km

Description : During the night when the F2 layer combines with F1 layer it falls to what approximate height? A. 250 km B. 350 km C. 300 km D. 400 km

Last Answer : C. 300 km

If a transmitting antenna is 100 meters high and a separate receiving antenna is 64 meters high, what is the maximum space wave communication distance possible between them? A. 18 km B. 72 km C. 164 km D. 656 km

Description : If a transmitting antenna is 100 meters high and a separate receiving antenna is 64 meters high, what is the maximum space wave communication distance possible between them? A. 18 km B. 72 km C. 164 km D. 656 km

Last Answer : B. 72 km

The angle of elevation of the antenna beam is 20°. Calculate the transmission-path distance for an ionospheric transmission that utilizes a layer of virtual height 200 km. Use flat-earth approximation. A. 966 km B. 2100 km C. 1100 km D. 405 km

Description : The angle of elevation of the antenna beam is 20°. Calculate the transmission-path distance for an ionospheric transmission that utilizes a layer of virtual height 200 km. Use flat-earth approximation. A. 966 km B. 2100 km C. 1100 km D. 405 km

Last Answer : C. 1100 km

Pick out the wrong statement (A) The concentric atmosphere layer just above troposphere is called stratosphere, which is rich in ozone (B) Mesosphere is characterised by very low atmospheric pressure and low temperature (C) Troposphere is a dusty zone containing water vapor and clouds (D) The radio waves used in the long distance radio communication are reflected back to earth by stratosphere

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Last Answer : (D) The radio waves used in the long distance radio communication are reflected back to earth by stratosphere

(a) Asteroids (b) Black Hole (c) Aurora (d) Sedimentary Rock (e) Epiphytes (f) Ionosphere

Description : (a) Asteroids (b) Black Hole (c) Aurora (d) Sedimentary Rock (e) Epiphytes (f) Ionosphere

Last Answer : a. Asteroids Asteroids, also called minor planets or planetoids, are a class of astronomical objects. The asteroid is a small celestial body that drift in the solar system in orbit around the ... . It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere.

In radio-communication, the signals emitted by transmitting antenna are reflected on – (1) stratosphere (2) ozonosphere (3) ionosphere (4) troposphere

Description : In radio-communication, the signals emitted by transmitting antenna are reflected on – (1) stratosphere (2) ozonosphere (3) ionosphere (4) troposphere

Last Answer : (3) ionosphere Explanation: The lower atmosphere is more or less transparent to radio waves. However, the ionosphere reflects back the radio waves. Thus, a signal emitted by an antenna from a ... on the surface of Earth in the following two ways: ground wave propagation and sky wave propagation.

In radio-communication, the signals emitted by transmitting antenna are reflected on (1) stratosphere(2) ozonosphere (3) ionosphere (4) troposphere

Description : In radio-communication, the signals emitted by transmitting antenna are reflected on (1) stratosphere(2) ozonosphere (3) ionosphere (4) troposphere

Last Answer : ionosphere

The lowest region of the earth’s atmosphere comes between the earth and stratosphere. what is this region’s name? A. Ionosphere B. Troposphere (Answer) C. Stratosphere D. Mesosphere

Description : The lowest region of the earth’s atmosphere comes between the earth and stratosphere. what is this region’s name? A. Ionosphere B. Troposphere (Answer) C. Stratosphere D. Mesosphere

Last Answer : B. Troposphere (Answer)

The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the (A) Ionosphere (B) Troposphere (C) Stratosphere (D) None of these

Description : The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the (A) Ionosphere (B) Troposphere (C) Stratosphere (D) None of these

Last Answer : (B) Troposphere

Which layer of the atmosphere contains the ionosphere?

Description : Which layer of the atmosphere contains the ionosphere?

Last Answer : i donot know

Which layer of the atmosphere contains the ionosphere?

Description : Which layer of the atmosphere contains the ionosphere?

Last Answer : i donot know

The atmospheric layer closest to the earth is: (1) Mesosphere (2) Hydrosphere (3) Troposphere (4) Ionosphere

Description : The atmospheric layer closest to the earth is: (1) Mesosphere (2) Hydrosphere (3) Troposphere (4) Ionosphere

Last Answer : (3) Troposphere Explanation: The troposphere is the lowest portion of Earth's atmosphere. It contains approximately 80% of the atmosphere's mass and 99% of its water vapor and aerosols. Most of the phenomena we associate with day-to-day weather occur in the troposphere.

The atmospheric layer farthest from the Earth's surface is known as– (1) Stratosphere (2) Exosphere (3) Ionosphere (4) (4)Mesosphere

Description : The atmospheric layer farthest from the Earth's surface is known as– (1) Stratosphere (2) Exosphere (3) Ionosphere (4) (4)Mesosphere

Last Answer : (2) Exosphere Explanation: The Radio waves are reflected back to Earth in the Ionosphere which is an electrically charged layer of the upper atmosphere. This process is used to communicate beyond the horizon, at intercontinental distances, mostly in the shortwave frequency bands.

Which layer of the earth's atmosphere contains the ozone layer? (1) Troposphere (2) Mesosphere (3) Ionosphere (4) Stratosphere

Description : Which layer of the earth's atmosphere contains the ozone layer? (1) Troposphere (2) Mesosphere (3) Ionosphere (4) Stratosphere

Last Answer : (4) Stratosphere Explanation: The ozone layer is a region of Earth's stratosphere. It is mainly found in the lower portion of the stratosphere, from approximately 20 to 30 kilometres (12 to 19 mi) ... nm to 315 nm wavelength), which other-wise would be harmful to exposed life forms on the earth.

Which of the following is the uppermost layer of the atmosphere? (1) Stratosphere (2) Mesosphere (3) Ionosphere (4) Exosphere

Description : Which of the following is the uppermost layer of the atmosphere? (1) Stratosphere (2) Mesosphere (3) Ionosphere (4) Exosphere

Last Answer : (4) Exosphere Explanation: The exosphere is the outermost layer of Earth's atmosphere. It extends from the exobase, which is located at the top of the thermosphere at an altitude of about ... molecules. The exosphere is located too far above Earth for any meteorological phenomena to be possible.

The layer of atmosphere close to the earth's surface is called – (1) Exosphere (2) Troposphere (3) Stratosphere (4) Ionosphere

Description : The layer of atmosphere close to the earth's surface is called – (1) Exosphere (2) Troposphere (3) Stratosphere (4) Ionosphere

Last Answer : (2) Troposphere Explanation: The troposphere is the lowest layer of Earth's atmosphere and site of all weather on Earth. It is bonded on the top by a layer of air called the Tropopause, which separates the troposphere from the stratosphere and on bottom by the surface of the Earth.

The lower layer of atmosphere is called (1) exosphere (2) troposphere (3) ionosphere (4) mesosphere

Description : The lower layer of atmosphere is called (1) exosphere (2) troposphere (3) ionosphere (4) mesosphere

Last Answer : (2) troposphere Explanation: The troposphere is the lowest layer of the Earth's atmosphere, The air is very well mixed and the temperature decreases with altitude.

In atmosphere the lowermost layer is – (1) troposphere (2) exosphere (3) ionosphere (4) strato sphere

Description : In atmosphere the lowermost layer is – (1) troposphere (2) exosphere (3) ionosphere (4) strato sphere

Last Answer : (1) troposphere Explanation: The troposphere is the lowest portion of Earth's atmosphere. It contains approximately 80% of the atmosphere's mass and 99% of its water vapor and aerosols. The average ... in winter. Most of the phenomena we associate with day-to-day weather occur in the troposphere

The layer of the atmosphere in which Radio Waves are reflected back is called- (1) Ionosphere (2) Troposphere (3) Stratosphere (4) Exosphere

Description : The layer of the atmosphere in which Radio Waves are reflected back is called- (1) Ionosphere (2) Troposphere (3) Stratosphere (4) Exosphere

Last Answer : (1) Ionosphere Explanation: The Radio waves are reflected back to Earth in the Ionosphere which is an electrically charged layer of the upper atmosphere. This process is used to communicate beyond the horizon, atintercontinental distances, mostly in the shortwave frequency bands.

The layer where the decrease in temperature with increasing altitude is totally absent is – (1) Troposphere (2) Ionosphere (3) Stratosphere (4) Mesosphere

Description : The layer where the decrease in temperature with increasing altitude is totally absent is – (1) Troposphere (2) Ionosphere (3) Stratosphere (4) Mesosphere

Last Answer : (3) Stratosphere Explanation: The stratosphere defines a layer in which temperatures rises with increasing altitude. At the top of the stratosphere the thin air may attain temperatures close to ... . Consequently, the stratosphere is almost completely free of clouds or other forms of weather.

Ozone layer is present in - (1) Troposphere (2) Ionosphere (3) Stratosphere (4) Exosphere

Description : Ozone layer is present in - (1) Troposphere (2) Ionosphere (3) Stratosphere (4) Exosphere

Last Answer : (3) Stratosphere Explanation: The ozone layer is mainly found in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth, though the thickness varies seasonally and ... in general thicker during the spring and thinner during the autumn in the northern hemisphere.

Which atmospheric layer contains ozone layer? (1) Genosphere (2) Zonosphere (3) Stratosphere (4) Ionosphere

Description : Which atmospheric layer contains ozone layer? (1) Genosphere (2) Zonosphere (3) Stratosphere (4) Ionosphere

Last Answer : (3) Stratosphere Explanation: The ozone layer is a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet (UV) radioation.

The layer of atmosphere used for radiowave transmission is – (1) chromosphere (2) troposphere (3) ionosphere (4) stratosphere

Description : The layer of atmosphere used for radiowave transmission is – (1) chromosphere (2) troposphere (3) ionosphere (4) stratosphere

Last Answer : (3) ionosphere Explanation: The ionosphere is a part of the upper atmosphere and is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner ... importance because, among other functions, it influences radio propagation to distant places on the Earth.

Which layer of the earth’s atmosphere reflects back the radio waves to the earth’s surface? (1) Ionosphere (2) Stratosphere (3) Mesosphere (4) Exosphere

Description : Which layer of the earth’s atmosphere reflects back the radio waves to the earth’s surface? (1) Ionosphere (2) Stratosphere (3) Mesosphere (4) Exosphere

Last Answer : (1) Ionosphere Explanation: Long distance propagation of radio waves depends on an invisible layer of charged particles, which envelops the Earth. This layer of charged particles known as the ionosphere ... communication during the early part of the twentieth century, the ionosphere came as a boon.

The atmospheric layer reflecting radio waves is called – (1) Ozonosphere (2) Ionosphere (3) Stratosphere (4) Mesosphere

Description : The atmospheric layer reflecting radio waves is called – (1) Ozonosphere (2) Ionosphere (3) Stratosphere (4) Mesosphere

Last Answer : (2) Ionosphere Explanation: The ionosphere is a part of the upper atmosphere, from about 85 km to 600 km altitude, comprising portions of the mesosphere, thermosphere and exosphere, ... importance because, among other functions, it influences radio propagation to distant places on the Earth.

The lowest layer of atmosphere is known as the (A) Stratosphere (B) Troposphere (C) Ionosphere (D) None of these

Description : The lowest layer of atmosphere is known as the (A) Stratosphere (B) Troposphere (C) Ionosphere (D) None of these

Last Answer : (B) Troposphere

The upper layer of atmosphere is called the (A) Stratosphere (B) Troposphere (C) Ionosphere (D) None of these

Description : The upper layer of atmosphere is called the (A) Stratosphere (B) Troposphere (C) Ionosphere (D) None of these

Last Answer : (A) Stratosphere

The main atmospheric layer near the surface of earth is a) Troposphere b) Mesosphere c) Ionosphere d) Stratosphere

Description : The main atmospheric layer near the surface of earth is a) Troposphere b) Mesosphere c) Ionosphere d) Stratosphere

Last Answer : a) Troposphere

Ozone layer is present in (1) Troposphere (2) Ionosphere (3) Stratosphere (4) Exosphere

Description : Ozone layer is present in (1) Troposphere (2) Ionosphere (3) Stratosphere (4) Exosphere 

Last Answer : Stratosphere

The layer of atmosphere used for radio-wave transmission is (1) chromosphere (2) troposphere (3) ionosphere (4) stratosphere

Description : The layer of atmosphere used for radio-wave transmission is (1) chromosphere (2) troposphere (3) ionosphere (4) stratosphere

Last Answer : ionosphere

Which layer of the earth’s atmosphere reflect back the radio waves to the earth’s surface ? (1) ionosphere (2) stratosphere (3) mesosphere (4) exosphere

Description : Which layer of the earth’s atmosphere reflect back the radio waves to the earth’s surface ? (1) ionosphere (2) stratosphere (3) mesosphere (4) exosphere 

Last Answer : ionosphere

The atmospheric layer reflecting radio waves is called (1) Ozonosphere (2) Ionosphere (3) Stratosphere (4) Mesosphere

Description : The atmospheric layer reflecting radio waves is called (1) Ozonosphere (2) Ionosphere (3) Stratosphere (4) Mesosphere 

Last Answer : Ionosphere

The layer where the decrease in temperature with increasing altitude is totally absent is (1) Troposphere (2) Ionosphere (3) Stratosphere (4) Mesosphere

Description : The layer where the decrease in temperature with increasing altitude is totally absent is (1) Troposphere (2) Ionosphere (3) Stratosphere (4) Mesosphere

Last Answer : Stratosphere

Which layer of the earth’s atmosphere contains the ozone layer ? (1) Troposphere (2) Mesosphere (3) Ionosphere (4) Stratosphere

Description : Which layer of the earth’s atmosphere contains the ozone layer ? (1) Troposphere (2) Mesosphere (3) Ionosphere (4) Stratosphere

Last Answer : Stratosphere