Deck 15: Standard Transmissions

Question 1

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

Answer 1

B

Question 2

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

Answer 2

D

Question 3

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 3

C

Question 4

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

Question 5

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

Question 6

How many countershafts are used in the forward section of a RoadRanger transmission?

A) none
B) one
C) two
D) three

Question 7

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

Question 8

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
D) all of the above

Question 9

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

Question 10

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

Question 11

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

Question 12

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

Question 13

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

Question 14

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

Question 15

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

Question 16

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

Question 17

Why is backlash required between meshing gears?

A) limits coasting whine
B) controls climbing
C) allows for heat expansion and lubrication of gears
D) all of the above

Question 18

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

Question 19

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

Question 20

Which Original Equipment Manufacturer (OEM)is known for triple-countershaft transmissions?

A) Freightliner
B) Navistar International
C) Mack Trucks
D) Kenworth

Question 21

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

Question 22

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

Question 23

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

Question 24

Which of the following is the closest to the outside diameter on a gear tooth?

A) dedendum
B) addendum
C) root
D) pitch line

Question 25

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

Question 26

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

Question 27

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

Question 28

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

Question 29

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

Question 30

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

Question 31

When a standard twin countershaft transmission is in high range,in what position is the range cylinder piston,yoke bar,and fork?

A) fully forward
B) fully rearward
C) center of travel
D) neutral

Question 32

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

Question 33

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

Question 34

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

Question 35

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

Question 36

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

Question 37

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

Question 38

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

Question 39

Which of the following is a disadvantage of spur gearsets?

A) produce high thrust forces
B) noise
C) torque losses
D) costly to manufacture

Question 40

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

Question 41

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)

Question 42

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

Question 43

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

Question 44

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

Question 45

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

Question 46

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

Question 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

Question 48

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

Question 49

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

Question 50

In a standard RoadRanger transmission,which of the following components could be described as floating?

A) input shaft
B) tailshaft
C) mainshaft
D) countershafts

Question 51

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

Question 52

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