Which valve was part of the first "121" law multi-valve/multi-tank system?

1. Task valve

2. RE valve

3. Serv valve

4. RT4 valve

The task valve system required a separate protected emergency tank

1. True

2. False

In the RT/RG system the RT valve is for service brakes and the RG valves are for parking

1. True

2. False

The two-way check valve incorporated in the RT4 valve allowed for the elimination of what?

1. A separated protected tank

2. Pressure protection valves

3. Protected supply lines

4. None of the above

In the RT/RG 2 tank - 3 valve system which component prevented automatic dynamiting of the parking brakes in case of a single tank failure?

1. One-way check valve

2. Two-way check valve

3. Pressure protection valve

4. Service brake relay valve

5. None of the above

Where does the RT/RG system gets its supply of air to release the spring brakes?

1. The trailer control line

2. The trailer tank/trailer supply line

3. The hand control valve

4. The regulating valve