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Chapter 5 Test

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Chapter 5 Test Chapter 5 Test Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. For every complete revolution of a four-stroke cycle diesel engine how many revolutions of the camshaft take place? a. one half c. two b. one d. four ____ 2. Technician A says that camshaft rotation must be in the same direction as crankshaft rotation. Technician B says that camshaft rotation may be opposite to crankshaft rotation. Who is right? a. Technician A only c. Both A and B b. Technician B only d. Neither A nor B ____ 3. Which of the following terms is used to describe the shortest radial dimension of a cam profile? a. inner base circle c. lift flank b. outer base circle d. unload flank ____ 4. Which of the following terms is used to describe the largest radial dimension of a cam profile? a. inner base circle c. lift flank b. outer base circle d. unload flank ____ 5. If a cam profile is described as being mostly outer base circle, what would be true of the train it actuates? a. actuated twice per revolution c. loaded for most of the cycle b. actuated every other revolution d. unloaded for most of the cycle ____ 6. Which of the following is NOT found in medium and heavy duty truck diesel engines? a. cast iron solid lifters c. roller type cam followers b. middle alloy steel solid lifters d. hydraulic lifters ____ 7. When a valve cam ramps from base circle to outer base circle, what is happening to the valve? a. it is stationary c. it is closing b. it is opening d. it is fully open ____ 8. Which of the following operates at the highest temperatures? a. exhaust valves c. solid lifters b. intake valves d. rockers ____ 9. When is valve float more likely to occur? a. high engine speeds c. engine rated speeds b. low engine speeds d. engine lugdown ____ 10. What is a major advantage of a valve rotator? a. sharper interference angle may be used b. reduce carbon buildup on seat c. lower tension valve springs can be used d. exhaust valves run cooler ____ 11. Which of the following tools should be used to check the operation of an installed valve rotator? a. light nylon hammer c. outside micrometer b. dial bore gauge d. stethoscope ____ 12. What part of a rocker contacts either the valve stem or valve bridge? a. adjusting screw c. pallet b. boss d. yoke ____ 13. What is the reason that OEMs specify greater valve lash for exhaust valves? a. run hotter c. shorter than intake valves b. run cooler d. longer than intake valves ____ 14. On an in-line 6 cylinder engine, when piston #5 is at TDC on it’s compression stroke, which valves can be adjusted? a. #5 c. #4 b. #2 d. #6 ____ 15. What is the recommended tool used to check valve lash dimension? a. thickness gauges c. inside micrometer b. dial indicator d. snap gauge ____ 16. When performing a valve lash adjustment on a diesel engine, which of the following is recommended? a. engine stationary and at operating temperature b. engine running and at operating temperature c. engine stationary and cold d. engine running and cold ____ 17. What is commonly used to position a camshaft gear on a camshaft? a. key and keyway c. interference fit b. loctite d. staking ____ 18. What is used to define camshaft endplay? a. captured thrust washers c. either free or captured thrust washers b. free thrust washers d. nothing ____ 19. What is the recommended method of measuring camshaft endplay? a. dial indicator c. thickness gauges b. depth micrometer d. calipers ____ 20. Technician A says that camshafts are used to convert linear motion into rotary force. Technician B says that a valve rocker can be considered to be part of the valve train actuated by cam profile. Who is correct? a. Technician A only c. Both A and B b. Technician B only d. Neither A nor B ____ 21. Which of the following is another way of describing valve keepers? a. margins c. fillet radius b. split locks d. headers ____ 22. How many keepers are required to retain one cylinder valve? a. one c. four b. two d. eight .
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