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Q:

What does the threshold number for Tau depend on?

A) Speed of the aircraft B) Size of the aircraft
C) Experience of the pilots D) Maneuverability of the aircraft
 
Answer & Explanation Answer: D) Maneuverability of the aircraft

Explanation: the threshold number for Tau, whether it is 10 sec or 100 sec depends on the ability of the aircraft to maneuver and avoid a collision.

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36
Q:

The time between the collision of two aircraft on a collision course is called _____

A) Differential time B) Tau
C) Traffic time D) Collision time
 
Answer & Explanation Answer: B) Tau

Explanation: Tau is the range of the other aircraft with respect to an aircraft divided by range rate. Range divided by range rate is time-essentially the time that would elapse before a collision.

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52
Q:

Both ATCRBS and mode S have the same range.

A) True B) False
 
Answer & Explanation Answer: A) True

Explanation: Mode S system and ATCRBS have the same interrogation frequency and the same reply frequency. The transmitter power output is similar to the ATCRBS transponder as is the receiver sensitivity which ensures that mode S transponders will have similar service ranges as ATCRBS transponders.

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30
Q:

A mode S transponder is silent when it is not interrogated.

A) True B) False
 
Answer & Explanation Answer: B) False

Explanation: Usually, a transponder remains silent when not interrogated. However, being an integral part of TCAS requires the occasional spontaneous mode S transmissions.

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37
Q:

Transmission of modes reply at regular interval to aid TACS is called ________

A) Garble B) Squitter
C) Fruit D) Pulsed Radar
 
Answer & Explanation Answer: B) Squitter

Explanation: An important transponder characteristic that aids TCAS is the transmission of a mode S reply at quasi-random intervals of about 1 sec, which is called squitter.

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34
Q:

The error caused by two aircraft flying close to each other replying to the same interrogation pulse is called ______

A) Garble B) Fruit
C) Noise D) Interference
 
Answer & Explanation Answer: A) Garble

Explanation: If several aircraft are within the range of the secondary radar and reply to the same interrogation pulse there is a chance that two reply pulses can overlap each other and cause an error in the values of interfere with different aircraft.

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44
Q:

How does mode S identify each aircraft?

A) Unique code for each transponder B) Lapsed time
C) RCS D) Directly talking to the pilot
 
Answer & Explanation Answer: A) Unique code for each transponder

Explanation: Unlike the ATCRBS where a squawk code is dialed into the transponder, a mode S transponder has a unique identity permanently assigned to it. The mode S radar system can have more than 16 million different identities, enough for each airplane in the world to have a unique identity.

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32
Q:

What are the numbers of non-selective interrogations in mode S system?

A) 5 B) 6
C) 7 D) 8
 
Answer & Explanation Answer: B) 6

Explanation: Mode S interrogations are divided into two types: selective and non-selective. The non-selective are the simplest and include familiar techniques. There is a total of 6 non-selective interrogations.

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