Exam 8: Hydraulic Fundamentals

A two-way check valve allows two different control devices to share a common outlet passage.

Which of the following can be used to either hold or drive a member of the planetary gear set?

Tech A says that bands are a type of hydraulic valve. Tech B says that servos are devices used to allow free movement in one direction and lock up in the other direction. Who is correct?

Technician A says check valves are classified as one-way and two-way in automatic transmissions. Technician B says two-way check valves are often used in the release circuit for application devices. Who is correct?

Technician A says that most bands are contracted by releasing fluid pressure from a servo. Technician B says that most bands are contracted by applying fluid pressure to a servo. Who is correct?

Which of these is used to regulate line pressure on computerized transmissions?

Surface filters have the ability to trap a larger amounts of material than depth filters.

Which of the following can be caused by low transmission fluid temperature?

Technician A says that governor pressure is controlled by torque converter rpm. Technician B says that governor pressure is controlled by output shaft speed. Who is correct?

Technician A says experienced transmission rebuilders never increase the size of the clutch and band application orifices. Technician B says experienced transmission rebuilders may install different accumulator springs or longer accumulator pistons to produce a firmer, quicker shift. Who is correct?

The lands are the larger part of a spool valve that fits with minimal clearance into the bore to prevent fluid from flowing around the valve.

Which of the following is not a holding device used in an automatic transmission?

Using hydraulics to apply clutches and bands is a good choice because fluids are not able to be compressed and, therefore, transmit force effectively.

Comparing observations made on the test drive to clutch and band apply charts can aid the technician in choosing which additional tests will best help diagnose the failure.

Technician A says spool valves have lands and valleys that are used to block or allow the flow of transmission fluid. Technician B says an automatic transmission uses spool valves, solenoids, and check valves to direct fluid flow. Who is correct?

Which of the following is used on some automatic transmissions in place of the vacuum modulator valve?

Small electric pumps are used in transmissions to supply pressure when the engine is turned off at a stop light to prevent a vehicle going into neutral or delayed transmission engagement when the engine is restarted.

Which of the following is an additive found in automatic transmission fluids?

Which of the following filter designs was developed to hold a greater volume of dirt and particles.

A __________ can be one of two different types: one-way or two-way.