Sistemas electronicos

Each radio transmitter installed in an aircraft used for international flights must have an FCC-issued ____ license. FCC ( federal communications commission). HF.

perform certain tuning operations on radio transmitters, technicians must hold the appropriate license issued by the. FCC ( federal communications commission). FMMA.

The radio-frequency carrier used in a radio transmitter is produced by a/an _____controlled oscillator. Crystal. Cobre.

A superheterodyne circuit is used in a radio. Receiver. Transmitter.

Most communication between civilian aircraft and ground facilities is in the_____frequency band. VHF. HF. UHF.

Most radio communication by aircraft operating over the oceans is done in the_____frequency band. HF. VHF. UHF.

SSB is the primary type of transmission for communication in the_____ band. HF. VHF.

One difference between AM and SSB radio communication is that SSB communication requires a______band of frequencies for its transmission. Narrower. Wider.

The old four course radio range operated in the ____ frequency range. Low. High.

The two fields that exist in a radio antenna are the: Electric fields, called E fields. Magnetic fields, called H fields. Magnetic full, called F fields.

Radio waves travel through space at a speed of____miles per second, or_____meters per second. 186.000. 300.000.000. 200.000.

Radio waves emitted from a vertical whip antenna are best picked up by a________antenna. Vertical. Horizontal.

A radio wave with a frequency of 136 MHz has a wavelength of______ meters. 2.21. 2.35.

VHF radio communication travel primarily by the_____waver. Or space. Ground. Sky.

Three critical characteristics of a radio antenna are: Length. Polarization. Dark. Directivity.

For an antenna to be most effective, its length should be____ of a wavelength. 1/2. 2/8.

A loop antenna____ directional. Is. Is not.

An antenna is connected to a transmitter with a____cable. Coaxial. Axial.

The system that allows an airline ground facility to monitor conditions existing in an aircraft in flight is called the. ACARS. SELCAL.

When an airline ground facility wishes to contact one of its aircraft in flight the_____system is used. SELCAL. ACARS.

A prerecorded emergency announcement in flight may be automatically initiated over a large aircraft's passenger address system in the event of a. Cable depressurization. Security industry.

Emergency locator transmitters operate on one or more frequencies. These are 121.5 MHz, 243 MHz, and ____ MHz. 406.025. 410.025.

Most ELTs are powered by_____. A self-contained battery. The aircraft electrical system.

An ELT is activated by an inertial switch that senses impact forces that are parallet to the _____axis to the aircraft. Longitudinal. Lateral.

An ELT is normally installed in the aircraft as far_____as possible. Aft. Forward.

When activated, the battery installed in an ELT must be capable of furnishing power for signal transmisaion for at least_____ hours. 48. 30.

An ELT battery must be replaced when it has been installed for____percent of its rated usable life. 50. 69.

The replacement date for an ELT battery must be legibly marked on the outside of the. Transmitter case. System case.

Operation of an analog ELT may be verified by tuning the VHF receiver to_____ MHz and activating the transmitter momentarily. 121.5. 138.5.

If you are going to operationally check an analog ELT, the test should be performed within_____ minutes after any hour. 5. 10.