Both A & B 

Tech B only

11. Which of the following engine brakes offers progressive step braking using from one to all six cylinders
A. Cummins Intebrake on pre 2010 ISX

12. Which vehicle technology enables nonengine controllers to request engine braking cycles?
B.  Multiplexing

A only


18. Technician A says that the exhaust ports in the engine and the passages in the exhaust manifold are large to allow free flow and expansion of the escaping gases. Technician B says that ports and passage are rather narrow to promote the fast movement of exhaust gas needed to turn the turbocharger turbine. Who is right?
Tech A