Chapter 21, Air Traffic Control System

Question 1

Side-lobes are inherent in which part of the
SSR interrogation?

Answer 1

Rotating antenna

Question 2

The transponder always suppresses any reply
when

Answer 2

P2 amplitude is ≥P1/P3

Question 3

Compared with primary radar, the transmission power used by secondary surveillance radar is

Answer 3

Lower

Question 4

ATCRBS ident codes are formatted in which
numbering system?

Answer 4

Decimal

Question 5

Directional and omnidirectional pulses are transmitted by the SSR for

Answer 5

Side-lobe suppression

Question 6

Mode C (altitude information) is derived from an

Answer 6

Altimeter or air data computer

Question 7

The special position ident (SPI) pulse is transmitted for a period of

Answer 7

15 to 20 seconds

Question 8

Side-lobe suppression is achieved by transmitting

Answer 8

Directional (P1/P3) and omnidirectional
(P2) pulses

Question 9

The transponder code of 7700 is used for

Answer 9

General air emergency

Question 10

ATC interrogations and replies are transmitted
on the following frequencies

Answer 10

Interrogation on 1030 MHz, replies on
1090 MHz

Question 11

The ‘Mode S all-call’ interrogation will cause
Mode A and C transponders to reply with their

Answer 11

Ident and altitude data