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Chapter 17
End of Chapter Review Questions Answer Key
1. Which one of the following statements is true of a torque converter when comparing it
with a standard fluid coupling?
2. What is commonly used to mount a torque converter to the engine crankshaft?
3. Which of the torque converter components is known as the driving member?
4. Which torque converter component is splined to a shaft that connects to the forward
clutch of the transmission?
5. Which of the torque converter components is responsible for torque multiplication?
6. What medium is used to transfer energy through a torque converter when it is not in
lockup mode?
7. Where is the stator located in a torque converter assembly?
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8. When is rotary fluid flow at a maximum during torque converter operation?
9. In a torque converter, which type of fluid flow has the effect of multiplying torque?
10. In which of the following phases would the drive efficiency of a torque converter be
at 100 percent?
11. What is the function of split guide rings in a torque converter?
12. In order for torque multiplication to take place in a torque converter, which of the
following should be true?
13. Which of the following is true during the torque converter coupling phase?
14. At torque converter coupling phase:
15. What is the most common lockup clutch design used in heavy-duty torque converters?
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16. 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?
17. If engine output torque to a torque converter with a stall torque ratio of 2:1 is 1,000
lb-ft., what would be the maximum converter output torque specification?
18. 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?
a. Technician A only
b. Technician B only
c. both A and B
d. neither A nor B
19. 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?
20. 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?