Which combination statements about the hydraulic system are true?

Which combination statements about the hydraulic system are true?

• A. All hydraulic circuits are fed by the main pressure circuit.
• B. The torque converter requires filling to function.
• C. Both statements are correct.
• D. Neither statement is correct.

Answer: (C)

The main idea is that a vehicle’s hydraulic system uses a single main pressure circuit to power the various hydraulic components, with pressure routed where needed through valves and lines. Because all the hydraulic devices rely on this pressurized fluid, the main pressure circuit effectively feeds the hydraulic circuits across the system. The first statement is true because, in standard drive-train hydraulics, the main pump creates the pressure supply that feeds the different hydraulic subsystems. There isn’t a separate independent pressure source for each circuit in typical designs; they’re all supplied from that common pressure source, just regulated to different levels as required. The torque converter inside the transmission relies on transmission fluid to transmit power and to lubricate its internal components. It must be filled with hydraulic fluid to function; without fluid, it cannot transfer torque between the engine and the transmission. So, both statements are true.

The main idea is that a vehicle’s hydraulic system uses a single main pressure circuit to power the various hydraulic components, with pressure routed where needed through valves and lines. Because all the hydraulic devices rely on this pressurized fluid, the main pressure circuit effectively feeds the hydraulic circuits across the system.

The first statement is true because, in standard drive-train hydraulics, the main pump creates the pressure supply that feeds the different hydraulic subsystems. There isn’t a separate independent pressure source for each circuit in typical designs; they’re all supplied from that common pressure source, just regulated to different levels as required.

The torque converter inside the transmission relies on transmission fluid to transmit power and to lubricate its internal components. It must be filled with hydraulic fluid to function; without fluid, it cannot transfer torque between the engine and the transmission.

So, both statements are true.