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

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

1 Answer

Answer :

A. Ionosonde
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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

The instrument which uses sound waves to measure the depth of oceans is – (1) Radar (2) Sonar (3) Altimeter (4) Venturimeter

Description : The instrument which uses sound waves to measure the depth of oceans is – (1) Radar (2) Sonar (3) Altimeter (4) Venturimeter

Last Answer : (2) Sonar Explanation: The instrument which uses sound waves to measure the depth of oceans is sonar. Sound waves can travel much faster from one point to another. Sound waves are far more ... Sonar may also be used in air for robot navigation, and SODAR is used for atmospheric investigations.

The instrument which uses sound waves to measure the depth of oceans is (1) Radar (2) Sonar (3) Altimeter (4) Venturimeter

Description : The instrument which uses sound waves to measure the depth of oceans is (1) Radar (2) Sonar (3) Altimeter (4) Venturimeter

Last Answer : Sonar

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.

What type of transmission is radiated from an aircraft’s radio altimeter antenna? A. An amplitude modulated continuous wave B. A pulse position modulated UHF signal C. A differential phase shift keyed UHF signal D. A frequency modulated continuous wave

Description : What type of transmission is radiated from an aircraft’s radio altimeter antenna? A. An amplitude modulated continuous wave B. A pulse position modulated UHF signal C. A differential phase shift keyed UHF signal D. A frequency modulated continuous wave

Last Answer : D. A frequency modulated continuous wave

What is the frequency range of an aircraft’s radio altimeter? A. 962 MHz to 1213 MHz B. 329.15 MHz to 335.00 MHz C. 4250 MHz to 4350 MHz D. 108.00 MHz to 117.95 MHz

Description : What is the frequency range of an aircraft’s radio altimeter? A. 962 MHz to 1213 MHz B. 329.15 MHz to 335.00 MHz C. 4250 MHz to 4350 MHz D. 108.00 MHz to 117.95 MHz

Last Answer : C. 4250 MHz to 4350 MHz

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Description : Electronic equipment used to measure standing wave ration. A. Reflectometer B. Wavemeter C. Altimeter D. Multimeter

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Last Answer : A. Calorimeter

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

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Last Answer : C. 1100 km

What height of an ionized layer is determined from the time interval between the transmitted signal and the ionospheric echo at vertical incidence? A. Virtual height B. Apparent height C. Actual height D. Effective height

Description : What height of an ionized layer is determined from the time interval between the transmitted signal and the ionospheric echo at vertical incidence? A. Virtual height B. Apparent height C. Actual height D. Effective height

Last Answer : A. Virtual height

Which instrument is used to measure altitudes in aircraft’s? (1) Audiometer (2) Ammeter (3) Altimeter (4) Anemometer

Description : Which instrument is used to measure altitudes in aircraft’s? (1) Audiometer (2) Ammeter (3) Altimeter (4) Anemometer

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Description : Instrument used to measure the force and velocity of the wind is – (1) Ammeter (2) Anemometer (3) Altimeter (4) Audiometer

Last Answer : (2) Anemometer Explanation: An anemometer is a device for measuring wind speed, and is a common weather station instrument. The term is derived from the Greek word anemos, meaning wind, and ... between the pressure and the speed, an anemometer designed for one will give information about both.

The instrument used to measure the speed of the wind is – (1) Altimeter (2) Anemometer (3) Chronometer (4) Dosimeter

Description : The instrument used to measure the speed of the wind is – (1) Altimeter (2) Anemometer (3) Chronometer (4) Dosimeter

Last Answer : (2) Anemometer Explanation: An anemometer is a device for measuring wind speed, and is a common weather station instrument. The term is derived from the Greek word anemos, meaning wind, ... aerodynamics. The first known description of an anemometer was given by Leon Battista Alberti around 1450.

Direct solar radiation is measured with — instrument.(Agriculture MCQ) a. Pyranometer b. Pyrheliometer c. Photometer d. Altimeter

Description : Direct solar radiation is measured with — instrument.(Agriculture MCQ) a. Pyranometer b. Pyrheliometer c. Photometer d. Altimeter

Last Answer : b. Pyrheliometer

The instrument used to measure the speed of the wind is (1) Altimeter (2) Anemometer (3) Chronometer (4) Dosimeter

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Last Answer : Anemometer

Instrument used to measure the force and velocity of the wind is (1) Ammeter (2) Anemometer (3) Altimeter (4) Audiometer

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Last Answer : Anemometer

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Last Answer : a. The altitude corresponding to cabin pressure regardless of aircraft height

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

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

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

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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

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Description : Best described a dip-meter. A. A variable LC oscillator with metered feedback current B. An SWR meter C. A counter D. A field strength meter

Last Answer : A. A variable LC oscillator with metered feedback current

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Last Answer : E. No answer

What do you call the random noise seen on radar display screen? A. Impulse noise B. Atmospheric noise C. Grass D. Johnson noise

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Last Answer : C. Grass

What determines the ability of radar to determine the bearing to a target? A. Speed of light B. Speed of target C. Antenna directivity D. Frequency of signal

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Last Answer : C. Antenna directivity

What is the most commonly used intermediate frequency of radar receivers? A. 40 MHz B. 60 MHz C. 70 MHz D. 30 MHz

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Last Answer : D. 30 MHz

For navigation as well as marine and aeronautical communications and radar, ____ band is used. A. L B. K C. S D. J

Description : For navigation as well as marine and aeronautical communications and radar, ____ band is used. A. L B. K C. S D. J

Last Answer : A. L

Which band of frequencies used by military for its satellites and radar? A. C band B. X band C. L band D. P band

Description : Which band of frequencies used by military for its satellites and radar? A. C band B. X band C. L band D. P band

Last Answer : B. X band

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Description : Which of the following is not a common microwave application? A. Radar B. Data transmission C. Space communications D. Mobile radio

Last Answer : D. Mobile radio

Which of the following systems is not used in radio detection and ranging? A. Frequency shift B. Frequency modulation C. Pulse radar D. Amplitude modulation

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Last Answer : D. Amplitude modulation

RADAR means A. Radio detection and rating B. Radio detection and ranging C. Radio distance and ranging D. Radio delay and ranging

Description : RADAR means A. Radio detection and rating B. Radio detection and ranging C. Radio distance and ranging D. Radio delay and ranging

Last Answer : B. Radio detection and ranging

Low-power radar uses A. RIMPATT B. TRAPATT C. Magnetron D. IMPATT

Description : Low-power radar uses A. RIMPATT B. TRAPATT C. Magnetron D. IMPATT

Last Answer : D. IMPATT

What is the height of the individual layers of the ionosphere?

Description : What is the height of the individual layers of the ionosphere?

Last Answer : D layer is 30-55 miles, E layer 55-90 miles, and F layers are 90- 240 miles.

What IF frequencies are normally used in radar receivers

Description : What IF frequencies are normally used in radar receivers

Last Answer : Thirty or sixty megahertz.

A surface-search radar normally scans how many degrees of azimuth?

Description : A surface-search radar normally scans how many degrees of azimuth?

Last Answer : 360 degrees.

An object nearer to a converging lens than its focal point always has a/an ______ image. a. Inverted b. The same in size c. Virtual d. Smaller size

Description : An object nearer to a converging lens than its focal point always has a/an ______ image. a. Inverted b. The same in size c. Virtual d. Smaller size

Last Answer : c. Virtual