Set 1 Past Paper Theory (PPT)

Question 1

What are the factors of the resolution on a PPI screen?

Answer 1

Beam Width of antenna
Pulse Length
Diameter of CRT beam

Question 2

What affects the Range Resolution on a Radar System?

Answer 2

Pulse width

Question 3

Purpose of Marker Beacon System?

Answer 3

To indicate the pilot that the airplane is passing over particular geographical locations such as:

• Points along an air route
• Points along an instrument landing path

Question 4

Operating modes & Functions of BITE

Answer 4

Modes: Normal, Advisory, Failure & Manual
Function: Fault detection, fault isolation and operational verification after defect repair.

Question 5

How does Failure mode work in ECAM?

Answer 5

This mode takes predecessor over all other modes and is auto selected by ECAM system when normal operating parameters exceeds. Aural alert and corrective actions are listed on left screen. Diagram displays on right screen.

Question 6

Difference in function of radio altimeter & barometric altimeter?

Answer 6

Barometric altimeter uses pressure to indicate aircraft altitude above sea level, while Radio altimeter uses radio signals to measure aircraft altitude above terrain.

Question 7

What is the main difference in principle of operation of Primary & Secondary Radar systems?

Answer 7

Primary Radar works on the principle of echo signals, while Secondary Radar works on the principle of Identification (Interrogation Pulses)

Question 8

How does VHF and HF waves travel?

Answer 8

VHF is by space (direct) waves

HF is by ground wave (short range) and sky wave (long range)

Question 9

What are the factors affecting VHF and HF transmission?

Answer 9

VHF: Transmission power (aircraft & ground station), Station elevation, Aircraft altitude, obstacles blocking signal
HF: Transmission power, time of day, season of year, ionosphere disturbance, geographical location, frequency in use.