Radio and Radar - Example Questions Flashcards
Selcal is a system which:
a) relieve the pilots from continuous monitoring of communication channels, and is operative on SATCOM
b) allows the pilot to selectively call a member of the cabin crew for assistance
c) relieves the pilots from continuous monitoring of communication channels, and is operative on HF and VHF radios
Relieves the pilots from continuous monitoring of communication channels, and is operative on HF and VHF radios
Page 114 under PURPOSE
A SELCAL code consists of:
a) two letters transmitted one after the other
b) two consecutive tone pulses each consisting of two simultaneously transmitted tones
c) one tone consisting of two simultaneously transmitted tones
Two consecutive tone pulses, each consisting of two simultaneously transmitted tones
Page 117 under INPUTS
The purpose of the High Frequency (HF) interlock is to:
a) ground unused antenna and isolate the unused keyline
b) isolate unused keyline but keep unused receiver operational
c) ensure both HF transmitters may be used simultaneously if required
Ground unused antenna and isolate the unused keyline
Page 65 under HF INTERLOCK SYSTEM
A frequency tolerance check is carried out on a VHF transmitter, the output is measured at 127.005 MHz for a selected frequency of 127 MHz, the transmitter is:
a) within tolerance for 25 kHz channel spacing
b) within tolerance for 8.33 kHz channel spacing
c) out of tolerance for 25 kHZ channel spacing
Out of tolerance for 25 kHz channel spacing
Tolerance for 8.33 kHz is 10 ppm and for 25 kHz it is 30 ppm
Page 27 under FREQUENCY TOLERANCE CHECK paragraph 3-5
An aircraft VHF antenna system is found to have forward power of 27 watts and reflected power of 3 watts at the antenna end. This is:
a) just within limits
b) acceptable
c) unacceptable
Just within limits
VSWR must never be more than 2:1
In a HF wire aerial system, the weak link is:
a) usually fitted inside the Aerial Tuning Unit (ATU)
b) interchangeable with the hard pin
c) normally found as part of the tension unit
Normally found as part of the tension unit
Page 58 under WIRE SYSTEM DETAILS - tension unit
The SELCAL system provides:
a) visual and aural notification only of an aircraft wishing to communicate with a ground station
b) aural notification only of a ground station wishing to communicate with an aircraft
c) visual and aural notification of a ground station wishing to communicate with an aircraft
Visual and aural notification of a ground station wishing to communicate with an aircraft
Page 113 under OPERATION
The purpose of the HF antenna tuner circuit is to provide a:
a) reactive load for the transmitter
b) resonant circuit in conjunction with the antenna
c) load for the receiver
Resonant circuit in conjunction with the antenna
Page 64, not confident
HF aerial spark gaps and static discharge resistors should be fitted near the:
a) aerial base
b) Aerial Tuning Unit Radio Frequency (ATU RF) output connection
c) transmitter (Tx) output
Aerial base
Page 56
An aircraft is fitted with a ‘R/T’, ‘OFF’, ‘INT’ switch in the Captain’s position. Information from the Captain’s microphone will be recorded on the CVR input on:
a) R/T position only
b) R/T and intercom only
c) all three positions
All three positions
Page 68 - TRANSMITTER OPERATION - Paragraph 3
On an aircraft HF system the most important function of the interlock circuit is to:
a) allow both transmitters to be keyed simultaneously
b) prevent both transmitters being keyed simultaneously
c) prevent both receivers being heard simulatenously
Prevent both transmitters being keyed simultaneously
Page 65 - HF INTERLOCK SYSTEM - First bullet point
When transmitting, a microphone’s polarising supply is derived from the:
a) transmitter
b) audio system
c) cockpit voice recorder (CVR)
Transmitter
Page 106 - PRACTICAL AIRCRAFT INSTALLATIONS - Paragraph 6
What operates the HF sidetone relay:
a) rectified RF
b) rectified AF
c) mic keying
Rectified RF
Page 40 - SSB - First paragraph and diagram on page 39
In a CVR, hot mics:
a) get their supply from the selected transmitter via the intercom - R/T switch
b) relate to all microphones on the aircraft
c) are as selected by the Boom Mask switches
Relate to all microphones on the aircraft
Page 100 - BASIC PRINCIPLES AND BLOCK INSTALLATION DIAGRAMS - Paragraph 7
Priority switching in the PA system:
a) ensures the captain overrides any other PA output
b) allows the stewardess to override the captain in the event of a cabin emergency
c) ensures the flight deck (any member) can override any other PA output
Ensures the captain overrides any other PA output
Page 95 - PASSENGER ADDRESS AMPLIFIER - First paragraph
