1.
About _______ percent of the turning torque applied to a head bolt is lost to
friction.
A. 60
B. 40
C. 80
D. 20
2. Valve stem height is most critical on
A. nonadjustable solid lifter systems.
B. hydraulic lifter engines.
C. overhead cam engines.
D. adjustable solid lifter systems
3. An interference angle machined on a valve or seat is usually _______ degree(s)
less than the seat angle.
A. 1
B. 0.5 to 0.75
C. 0.005
D. 1.5
4. If lift and duration remain constant and the lobe center angle decreases,
A. effective duration increases.
B. valve overlap decreases.
C. valve overlap increases.
D. effective lift increases.
5. Cleaning chemicals are usually made of either a caustic or acid material. Which
of the following statements is true?
A. An acid is lower than 7 and a caustic is higher than 7 on the pH scale.
B. Both caustics and acids have a pH of 7 if rated according to distilled water.
C. Pure water is a 1 and strong acid a 14 on the pH scale.
D. An acid is higher than 7 and a caustic is lower than 7 on the pH scale.
6. If a gasket surface is too smooth, it
A. has too high a microinch finish.
B. won't be able to seal the deep grooves in the surface.
C. can move out of proper location, causing leakage.
D. will allow the cylinder to function at too fast a rate.
7. Some connecting rods have _______ to help lubricate the cylinder wall or
piston pin.
A. three-rod bolts
B. spit holes
C. drip valves
D. graphite coatings
8. Dampers (damper springs) are used inside some valve springs to
A. prevent valve spring surge.
B. decrease valve spring pressure.
C. retain valve stem seals.
D. keep the valve spring attached to the valve.
9. Two technicians are discussing variable valve timing. Technician A says that
changing the exhaust valve timing helps reduce exhaust emissions. Technician B
says that changing the intake valve timing helps increase low-speed torque. Who is
correct?
A. Neither Technician A nor B
B. Technician B
C. Both Technicians A and B
D. Technician A
10.
What cylinder head operation is the technician performing in this figure?
A. Installing the valve guide
B. Inserting the valve
C. Measuring valve guide size
D. Measuring seat width
11. A/An _______ is a measuring tool thats used to measure very small spaces
between two parts.
A. feeler gage
B. Vernier caliper
C. inside micrometer
D. outside micrometer
12. In a normally operating engine, intake and exhaust valves are opened by a
cam and closed by
A. valve guides and/or pushrods.
B. lifters/tappets.
C. valve springs.
D. rocker arms or cam follower.
13. Technician A says that a vibration damper, also known as a harmonic
balancer, is used to dampen harmful twisting vibrations of the crankshaft.
Technician B says that most engines are balanced after manufacturing. Who is
correct?
A. Technician A
B. Technician B
C. Both Technicians A and B
D. Neither Technician A nor B
14. Technician A says any normal chemicals can be used to clean aluminum parts
or components. Technician B says most chemical cleaners are strong soaps called
caustic materials. Who is correct?
A. TechnicianA
B. Technician B
C. Neither Technician A nor B
D. Both Technicians A and B
15. Technician A says that glues are used to help gaskets seal. Technician B says
that deburring all sharp edges is an important step that must be done to achieve
proper engine assembly. Who is correct?
A. Neither Technician A nor B
B. Technician B
C. Technician A
D. Both Technicians A and B
16.
In this figure, the blue shim is used for adjusting the valve
A. tightness.
B. height.
C. O-ring.
D. durability.
17. If bearing-to-journal clearance is doubled, _______ as much oil will flow from
the edges of the bearing.
A. more than four times
B. less than one-half
C. two-thirds
D. two times
18. Which of the following tools would be used to tighten a nut or bolt with a
precise amount of twisting force?
A. Open-end wrench
B. Box-end wrench
C. Torque wrench
D. Torx wrench
19. What measuring tool is used to measure the distance in which a part can move
freely?
A. Inside micrometer
B. Dial indicator
C. Ruler
D. Vernier caliper
20. A short block includes all of the following except
A. pistons.
B. cylinder heads.
C. rods and rod bearings.
D. the crankshaft and main bearings.
