What is the wavelength of an ndb transmitting on 375 khz ? [ Multiple protocol ]
Question 175-1 : 800 m 8000 m 8 m 80 m

Phase modulation is ?
Question 175-2 : A modulation form used in gps where the phase of the carrier wave is reversed a modulation form used in ils where the navigation phase signal changed from 90° or 150° the cause of an amplitude change of the carrier the cause of polarisation of the modulated signal

Factors liable to affect most ndb/adf system performance and reliability include ?
Question 175-3 : Static interference night effect absence of failure warning system static interference station interference latitude error height error station interference mountain effect coastal refraction lane slip mountain effect

Due to 'doppler' effect an apparent decrease in the transmitted frequency which ?
Question 175-4 : The transmitter moves away from the receiver the transmitter and receiver move towards each other the transmitter moves toward the receiver there is no relative movement between the transmitter and the receiver

Which one of the following disturbances is most likely to cause the greatest ?
Question 175-5 : Local thunderstorm activity coastal effect quadrantal error precipitation interference

The advantage of the use of slotted antennas in modern radar technology is to ?
Question 175-6 : Virtually eliminate lateral lobes and as a consequence concentrate more energy in the main beam simultaneously transmit weather and mapping beams have a wide beam and as a consequence better target detection eliminate the need for azimuth slaving

The frequency which corresponds to a wavelength of 12 cm is ?
Question 175-7 : 2500 mhz 2500 khz 360 mhz 3600 mhz

A cumulonimbus cloud in the vicinity of an aeroplane can cause certain ?
Question 175-8 : Adf vor weather radar dme

A radio altimeter employing a continuous wave signal would have ?
Question 175-9 : A directional aerial for transmission and another one for reception an omni directional aerial for transmission and directional aerial for reception a directional aerial for transmission and an omni directional aerial for reception a directional aerial for both transmission and reception

Which statement relating to the stabilization of airborne weather radar ?
Question 175-10 : They are stabilized with respect to the pitch and rollaxis but not with respect to the yaw axis they are stabilized with respect to the pitch roll and yaw axis they are stabilized with respect to the yaw axis but not with respect to the pitch and roll axis the pilot can choose the axes of stabilization with the system's stabilization selector switch

The antennae of modern airborne weather radars are stabilized by means of ?
Question 175-11 : Inputs from the aircraft's attitude system artificial gravity switches mercury switches feedback from the antenna accelerometers

The type of modulation used for the ils frequency carrier is ?
Question 175-12 : Amplitude modulation frequency modulation phase modulation dual modulation

The quadrantal error of an adf ?
Question 175-13 : Is caused by the refraction from the aircraft's fuselage and is compensated for is caused by aircraft magnetism and varies with the deviation as shown on the deviation table is caused by interference from the sky wave may be caused by the interference of vor's within range of the adf receiver and cannot be compensated for

The skip distance of hf transmission will increase with ?
Question 175-14 : Higher frequency and higher position of the reflecting ionospheric layer lower frequency and higher position of the reflecting ionospheric layer higher frequency and lower position of the reflecting ionospheric layer lower frequency and lower position of the reflecting ionospheric layer

Which statement about the errors and effects on ndb radio signals is correct ?
Question 175-15 : The mountain effect is caused by reflections onto steep slopes of mountainous terrain which may cause big errors in the bearing night effect is a result of interference of the surface wave and the space wave causing a reduction in range lightning during atmospheric disturbances may cause a reduction of the signal strength that may result in only slight bearing errors shore line effects may cause a huge bearing error due to reflection of the radio signal onto steep coasts

What causes the so called night effect ?
Question 175-16 : A change in the direction of the plane of polarisation due to reflection in the ionosphere the difference in velocity of the em waves over land and over sea at night the absence of the surface wave at distances larger than the skip distance interference between the ground and the space wave

An amplitude modulation is shown in the figure . 2069 ?
Question 175-17 : A b c d

In his basic type a dipole antenna adapted for a frequency of 110 mhz will have ?
Question 175-18 : 136 cm 273 cm 91 cm 205 cm

How is the unit 'hertz' hz defined ?
Question 175-19 : The number of electromagnetic oscillations per second duration of an oscillation the distance covered by a radio wave in one second the number of electromagnetic oscillations per minute

An ndb transmits on 427 khz the corresponding wavelength is ?
Question 175-20 : 702 5 m 702 5 cm 7025 cm 70 25 cm

An electromagnetic wave consists of an oscillating electric field e and an ?
Question 175-21 : The speed of light the speed of sound for field e and the speed of light for field h the speed of light for field e and the speed of sound for field h the speed of sound

The electromagnetic waves refracted from the e and f layers of the ionosphere ?
Question 175-22 : Sky waves ground waves refracted waves space waves

The simplest type of antenna construction is a ?
Question 175-23 : Dipole antenna which is a wire of length equal to one half of the wavelength parabolic antenna used in weather radars slotted antenna used in modern weather radars loop antenna used in old adf receivers

An electromagnetic wave consists of an oscillating electric field e and an ?
Question 175-24 : The e and h fields are perpendicular to each other a dipole antenna can only transmit field h the h field is parallel to the wire and field e is perpendicular to the wire when ac current pass through the antenna fields e and h are parallel

The frequency which corresponds to a wavelength of 8 25 m is ?
Question 175-25 : 36 36 mhz 3636 mhz 363 6 mhz 3 63 mhz

The frequency which corresponds to a wavelength of 3 km is ?
Question 175-26 : 100 khz 10 khz 1000 khz 1 mhz

Wavelength of frequency 117 95 mhz is ?
Question 175-27 : 2 5 m 25 m 250 m 254 m

Concerning the wave propagation in the ionosphere we denote three layers those ?
Question 175-28 : D e and f layers and their depth varies with time d e and f layers and their depth does not vary with time a b and c layers and their depth varies with time a c and e layers with equal depth

Radio waves travel at ?
Question 175-29 : The speed of light the speed of sound a speed depending on the type of the electromagnetic waves a speed just below the speed of sound

In accordance with the itu international telecommunication union a radio signal ?
Question 175-30 : Nature of information to be transmitted type of modulation of the main carrier nature of signal s modulating the main carrier type of modulation of the secondary carrier

In accordance with the itu international telecommunication union a radio signal ?
Question 175-31 : Nature of signal s modulating the main carrier type of information to be transmitted type of modulation of the secondary carrier type of modulation of the main carrier

In accordance with the itu international telecommunication union a radio signal ?
Question 175-32 : Type of modulation of the main carrier nature of signal s modulating the main carrier type of information to be transmitted type of modulation of the secondary carrier

Vhf very high frequency waves appear in the frequency spectrum ?
Question 175-33 : 30 mhz 300 mhz 3 mhz 30 mhz 300 mhz 3000 mhz 3 ghz 30 ghz

With regard to radio waves propagation a cycle is defined as ?
Question 175-34 : A complete series of values of a periodical process a number of oscillation per second the lenght of the pulse the distance covered by a radio wave in one second

Vlf very low frequency waves appear in the frequency spectrum ?
Question 175-35 : 3 khz 30 khz 30 mhz 300 mhz 300 mhz 3000 mhz 3 ghz 30 ghz

Lf low frequency waves appear in the frequency spectrum ?
Question 175-36 : 30 khz 300 khz 30 hz 300 hz 300 mhz 3000 mhz 3 mhz 30 mhz

Mf medium frequency waves appear in the frequency spectrum ?
Question 175-37 : 300 khz 3000 khz 30 mhz 300 mhz 3 mhz 30 mhz 30 ghz 300 ghz

Hf high frequency waves appear in the frequency spectrum ?
Question 175-38 : 3 mhz 30 mhz 30 mhz 300 mhz 300 mhz 3000 mhz 3 khz 30 khz

Uhf ultra high frequency waves appear in the frequency spectrum ?
Question 175-39 : 300 mhz 3000 mhz 30 mhz 300 mhz 3 mhz 30 mhz 3 ghz 30 ghz

Shf super high frequency waves appear in the frequency spectrum ?
Question 175-40 : 3 ghz 30 ghz 30 mhz 300 mhz 3 mhz 30 mhz 300 mhz 3000 mhz

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