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1. Which of the following is NOT an advantage of helical gears?
a.
quiet performance
b.
more than one tooth is in mesh at the same time
c.
reduce thrust forces
d.
high strength
2. If transmission with a 5-speed main box is compounded by a two speed auxiliary section, how many gear ratios would
be possible?
a.
3
b.
5
c.
7
d.
10
d
3. When a gear with 14 teeth drives a gear with 21 teeth, how will speed and torque output be changed?
a.
speed increases, torque decreases
b.
torque increases, speed decreases
c.
both torque and speed decrease
d.
both speed and torque increase
b
4. Which of the following transmission gear ratios reduces transmission output shaft speed the most?
a.
3.60:1
b.
2.85:1
c.
1.20:1
d.
0.73:1
5. Which Original Equipment Manufacturer (OEM) is known for triple-countershaft transmissions?
a.
Freightliner
b.
Navistar International
c.
Mack Trucks
d.
Kenworth
6. Which of the following BEST describes the role of the auxiliary section in a truck standard transmission?
a.
reduces torque output
b.
multiplies the available gear ratios
c.
reduces transmission length
d.
enables faster road speeds in lower ranges
b
7. How many countershafts are used in the forward section of a RoadRanger transmission?
a.
none
b.
one
c.
two
d.
three
8. Why is backlash required between meshing gears?
a.
limits coasting whine
b.
controls climbing
c.
allows for heat expansion and lubrication of gears
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d.
all of the above
ANSWER:
c
9. If a drive gear is required to rotate a driven gear in the same direction of rotation, which of the following is a
requirement?
a.
drive gear must be larger in diameter than the driven gear
b.
drive gear must double the number of teeth on the driven gear
c.
idler gear is required between the drive and driven gears
d.
two tooth-meshed gears always turn in the same direction
ANSWER:
c
10. If a truck transmission is described as being non-synchronized, which of the following is a recommended driving
technique?
a.
double-clutching
b.
having a good ear
c.
feathering the clutch
d.
rapid gear engagements to avoid clashing
11. In order to activate the low-low ratio in a deep-reduction transmission in a heavy-duty truck which of the following
must be done?
a.
actuate the split-shifter
b.
actuate the deep-reduction valve
c.
stop the truck
d.
all of the above
d
12. Which of the following terms is often used to describe a certain type of transfer case?
a.
compound
b.
PTO
c.
differential carrier
d.
drop-box
ANSWER:
d
13. Which of type of transmission auxiliary section is used to provide an overdrive ratio?
a.
two-speed auxiliary
b.
three-speed auxiliary
c.
both A and B
d.
neither A nor B
b
14. When discussing the rotation of gears and shafts in a truck transmission, which of the following terms can be used to
describe clockwise rotation?
a.
forward
b.
right-hand
c.
left-hand
d.
both A and B
d
15. Which of the following best defines the axis of rotation of a gear or shaft?
a.
centerline about which it revolves
b.
direction of rotation: clockwise or counterclockwise
c.
endplay
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d.
all of the above
16. In which of the following gear combinations is bottoming a potential problem?
a.
two-gear drive combinations
b.
multiple-gear drive combinations
c.
both A and B
d.
neither A nor B
17. When one gear is in mesh and turning another, which of the following describes type of contact that results?
a.
sliding action
b.
rolling action
c.
both A and B
d.
neither A nor B
18. A gear with 45 teeth rotating at 400 RPM is driving a second gear with 75 teeth. How fast is the driven gear rotating?
a.
120 rpm
b.
240 rpm
c.
400 rpm
d.
750 rpm
19. A gear of 12 inches (305 mm) in diameter is driving a second of 24 inches (610 mm) in diameter. Which of the
following will result from the driven gear?
a.
speed increase only
b.
torque reduction, increased speed
c.
increased torque, reduced speed
d.
torque increase only
20. When a truck transmission uses helical gearing, which of the following has to be true?
a.
both right-hand and left-hand gears must be used
b.
only right-hand gears can be used
c.
only left-hand gears can be used
d.
no ratio change is possible
21. When a twin countershaft, truck transmission is in reverse gear, in what direction will the countershafts rotate?
a.
clockwise (CW)
b.
counter-clockwise (CCW)
c.
one CW and one CCW
d.
countershafts do not rotate in reverse ratio
22. Which of the following valves distributes air to either the low- or the high-range sections of a range cylinder to effect
a shift?
a.
slave valve
b.
splitter valve
c.
insert valve
d.
deep-reduction valve
23. When a standard twin countershaft transmission is in high range, in what position is the range cylinder piston, yoke
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bar, and fork?
a.
fully forward
b.
fully rearward
c.
center of travel
d.
neutral
24. Where is the range shift cylinder located on a standard twin countershaft transmission with an auxiliary section?
a.
rear of the auxiliary section
b.
left side of the transmission
c.
underside of the transmission
d.
on the shift tower hub
25. When the teeth of one gear contact the roots of its mating gear, this is known as:
a.
climbing
b.
zero lash
c.
bottoming
d.
clashing
26. When the apex of the teeth on one gear rolls over the apex of the gear it is in mesh with, this is known as:
a.
climbing
b.
zero lash
c.
bottoming
d.
clashing
27. What is the reason that a gear climbing condition tends to be short-lived?
a.
the condition is self-correcting
b.
the gear teeth are quickly destroyed
c.
it creates a new tooth contact pattern
d.
the gear roots get ground out
b
28. Which of the following is the closest to the outside diameter on a gear tooth?
a.
dedendum
b.
addendum
c.
root
d.
pitch line
b
29. When the output speed exceeds the input speed of a gearset, this is known as:
a.
torque multiplication
b.
under-drive
c.
over-drive
d.
speed reduction
30. Technician A says that anything that rotates, requires torque to make it turn. Technician B says that torque is
calculated by multiplying applied force by its distance from the centerline of rotation. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
31. If a force of 25 pounds is applied perpendicular to the centerline of a shaft, two feet from its centerline, how much
torque is produced?
a.
12.5 pound feet
b.
25 pound feet
c.
50 pound feet
d.
100 pound feet
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32. Technician A says that most gearing used in a typical truck transmission is torque reducing and speed increasing.
Technician B says that when a standard transmission is in 1:1 ratio, the engine flywheel and the transmission tailshaft
should rotate at the same speed. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
b
33. A gear with teeth machined straight and parallel to the shaft on which they are mounted are known as:
a.
spur gear
b.
helical gears
c.
amboid gears
d.
spiral gears
34. Which of the following is a disadvantage of spur gearsets?
a.
produce high thrust forces
b.
noise
c.
torque losses
d.
costly to manufacture
b
35. Technician A says that the mainshaft and countershafts in twin and triple countershaft transmissions are mounted
parallel to each other. Technician B says that in any multiple countershaft transmission, torque from the input shaft is
routed first to the mainshaft, then to the countershafts. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
36. Technician A says that the torque load in a multiple countershaft transmission is distributed evenly through the
countershafts. Technician B says that most heavy-duty truck transmissions use a triple countershaft design. Who is
correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
37. What defines the upper and lower rpm shift limits of a truck transmission?
a.
number of gear ratios
b.
engine torque rise profile rpms
c.
final drive carrier ratio
d.
tailshaft rpm
38. When a driver is using a progressive shift technique on a standard transmission, what is he doing?
a.
downshifting at rpm slightly above the lower shift limit
b.
upshifting at an rpm below the upper shift limit rpm
c.
saving fuel
d.
all of the above
d
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39. What holds a shift rail bar in position when it is moved into a gear position in a truck standard transmission?
a.
dog clutch
b.
blocker ring
c.
detent mechanism
d.
electric shift motor
40. What component in a shift rail detent mechanism engages directly with the groove in rail bar?
a.
detent spring
b.
detent ball
c.
detent lug
d.
detent yoke
b
41. Technician A says that on a twin countershaft transmission, the gears on the countershaft are in constant mesh with
those on the mainshaft. Technician B says that countershaft gear motion is not transferred to the mainshaft, until a sliding
clutch locks a mainshaft gear to the mainshaft. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
42. Technician A says that when making a 5-6 upshift on a 10-speed transmission, the gearshift lever should be moved
into the sixth gear position before flipping the range control button into high range. Technician B says that when making
a 6-5 downshift on a 10-speed transmission, the range control button should be flipped into low range before the gearshift
lever is moved into the fifth gear position. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
43. What is a typical air pressure regulator specification for the pneumatics on a RoadRanger compounded truck
transmission?
a.
30 psi
b.
60 psi
c.
90 psi
d.
120 psi
b
44. Technician A says that gear ratio selection in the main box of a standard RoadRanger transmission is effected
mechanically by the gearshift lever. Technician B says that range selection in the auxiliary section of the same
transmission is effected pneumatically. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
45. What is an auxiliary drive system for chassis accessories such as hydraulic pumps driven by the transmission known
as?
a.
auxiliary transmission
b.
drop box
c.
transfer case
d.
power-takeoff (PTO)
46. In a standard RoadRanger transmission, which of the following components could be described as floating?
a.
input shaft
b.
tailshaft
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c.
mainshaft
d.
countershafts
47. Which of the following transmission gear ratios would permit the greatest torque output to the drivetrain?
a.
5.36 : 1
b.
2.32 : 1
c.
1 : 1
d.
0.66 : 1
48. What is the function of synchronizers in a truck transmission?
a.
bring the rotational speed of two rotating components to a single speed
b.
locks two rotating components together
c.
reduce gear clashing
d.
all of the above
d
49. When the term all-wheel drive (AWD) is applied to four axle truck with two steering axles, which axles receive drive
torque?
a.
all four
b.
one steering, tandem-driven rear
c.
one steering, one rear
d.
two steering, one rear
b
50. Technician A says that a RoadRanger 18-speed transmission uses a five-speed main box using identical principles to
that in a 10-speed transmission. Technician B says that a Roadranger 18-speed transmission uses twin compounds, one
located in front of, the other behind, the main section. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B
51. What is located at a point exactly in between the root and apex (outside diameter) of a gear tooth?
a.
addendum
b.
dedendum
c.
root line
d.
pitch line
d
52. Technician A says that the pitch line diameter of a spur gear exceeds its root diameter. Technician B says that when a
pair of gears are properly in mesh, there should be contact between the apex (outside diameter) of each gear tooth with its
opposite’s root. Who is correct?
a.
Technician A only
b.
Technician B only
c.
Both A and B
d.
Neither A nor B