ch 17

Technician A says that bolted torque converters can usually be serviced and repaired. Technician B says that welded torque converter housings can usually be serviced and repaired. Who is correct?

a. Technician A only

Technician A says that when a truck is stationary, and the engine is running at idle, the torque converter behaves like a disengaged clutch. Technician B says that whenever the torque converter impeller is rotating, there is output to the transmission. Who is correct?

a. Technician A only

In order for torque multiplication to take place in a torque converter, which of the following should be true?

a. The pump/impeller must turn faster than the turbine.

Which of the torque converter components is known as the driving member?

a. the pump/impeller

What is the function of split guide rings in a torque converter?

a. to reduce turbulence

At torque converter coupling phase:

a. vortex flow is at a minimum

Which one of the following statements is true of a torque converter when comparing it with a standard fluid coupling?

b. A torque converter is capable of multiplying torque.

Which of the following is true during the torque converter coupling phase?

b. Turbine speed is just slightly slower than impeller speed.

Where is the stator located in a torque converter assembly?

b. between the pump/impeller and turbine

Which of the torque converter components is responsible for torque multiplication?

b. the stator

What medium is used to transfer energy through a torque converter when it is not in lockup mode?

b. transmission fluid

In a torque converter, which type of fluid flow has the effect of multiplying torque?

b. vortex flow

If engine output torque to a torque converter with a stall torque ratio of 2:1 is 1,000 lb-ft. (1,356 N∙m), what would be the maximum converter output torque specification?

c. 2,000 lb-ft. (2,712 N∙m)

What is commonly used to mount a torque converter to the engine crankshaft?

c. a flexplate

When is rotary fluid flow at a maximum during torque converter operation?

c. at coupling phase

Technician A says that engine and the T/C impeller should both turn at the same rpm. Technician B says that T/C turbine and transmission input shaft should both turn at the same rpm. Who is correct?

c. both A and B

What is the most common lockup clutch design used in heavy-duty torque converters?

c. piston

Which torque converter component is splined to a shaft that connects to the forward clutch of the transmission?

c. the turbine

In which of the following phases would the drive efficiency of a torque converter be at 100 percent?

d. lockup

Technician A says that a torque converter (T/C) with a stall torque ratio of 1.5:1 can transmit 75 percent of engine torque to the transmission it is coupled to. Technician B says that when the engine rpm, T/C impeller rpm, and T/C turbine rpm are all identical, the T/C is operating in rotary flow mode. Who is correct?

d. neither A nor B