1.  Where does the relay valve receive its supply air from?
Select the best answer A. From the supply reservoir B. From the service reservoir C. From the foot valve D. None of the above

2.  Where is a pressure protection valve used?
Select the best answer A. Between the supply tank and the primary service tank B. Between the supply tank and the secondary service tank C. Between the supply tank and the suspension tank D. None of the above

3.  What air brake system component controls the air to the service brake chambers?
Select the best answer A. The air tank B. The governor C. The foot valve D. The compressor

4.  What controls the air compressor unloader?
Select the best answer A. Engine speed B. Purge valve C. Inversion valve D. Governor

5.  Which reservoir must have a low air pressure warning device in a dual air brake system?
Select the best answer A. Rear service reservoir only B. Front service reservoir only C. Both front and rear service reservoirs D. Supply reservoir only

  Check Your Answers Pull down for answers Question 1 B. From the service reservoir Question 2 C. Between the supply tank and the suspension tank Question 3 C. The foot valve Question 4 D. Governor Question 5 C. Both front and rear service reservoirs

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