Deck 21: Continuously Variable Transmissions

Question 1

All of the following are the advantage of using the CVT in the vehicle except:

A) It greatly helps in emission control.
B) The transmission can infinitely change the gear ratio within its operational design.
C) It offers a smooth, step-less transmission.
D) This design allows the engine to operate in its most efficient operating rpm range for fuel economy or performance.

Answer 1

A

Question 2

The CVT most commonly found in hybrid vehicles is known as:

A) toroidal CVT.
B) Reeves drive CVT.
C) roller-based CVT.
D) ECVT.

Answer 2

D

Question 3

Choose the correct statement with respect to variable-diameter pulley CVT.

A) It uses two variable-diameter pulleys.
B) It is the least common CVT.
C) Most manufacturers prefer a rubber belt over a steel belt between the pulleys.
D) The drive ratio from a stop is approximately 1:1 through the pulleys.

Answer 3

A

Question 4

At high speed, the gear ratio of the pulleys is:

A) 1:1.
B) 2:1.
C) 3:1.
D) 1:2.

Question 5

The belt can be replaced using a(n):

A) impact gun.
B) pry bar.
C) compression tool.
D) seal puller.

Question 6

Choose the correct statement with respect to a toroidal CVT.

A) It is cheap to manufacture.
B) It can handle larger amounts of torque.
C) Its design uses two curved discs-an input disc and an output disc.
D) A universal transmission fluid is best suited for this CVT.

Question 7

Which of the following allow the transmission to operate in reverse?

A) Clutch packs
B) Sensors
C) Levers
D) Torque converters

Question 8

Choose the correct statement.

A) Pressure in a CVT can be measured using a traditional transmission pressure gauge.
B) The peak operating pressure in a typical CVT is around 250 psi (1724 kPa).
C) Many CVTs have a special transmission oil heater built into them.
D) Universal CVT fluid is not recommended for any CVT.

Question 9

Tech A states that CVTs should not be rebuilt and should only be replaced with complete units. Tech B states that some manufacturers do not recommend rebuilding their CVTs. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 10

Tech A states that special tools will be required to replace the belt in a CVT. Tech B states that CVT belts can be rebuilt by specialty shops. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 11

Tech A states that CVTs utilize very specific transmission fluid that should not be substituted. Tech B states that universal CVT fluid will work in all CVTs. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 12

Tech A states that toroidal CVTs are commonly sold by manufacturers. Tech B states that toroidal transmissions are expensive to manufacture. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 13

Tech A states that some manufacturers display transmission fluid life on the scan tool. Tech B states that CVTs typically require fluid service between 60K and 80,000 miles (128,748 km). Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 14

Tech A states that some CVTs offer a low range gear for extra torque when needed. Tech B states that many CVTs utilize a cogged rubber belt for the drive belt. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 15

Tech A states that manufacturers use CVTs in order to increase fuel economy. Tech B states that CVTs are designed to keep an engine operating at its most efficient RPM. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 16

All of the following statements are true with respect to belt service except:

A) Belts need to be replaced if there are any signs of wear on them.
B) Transmission can compensate for a small amount of wear in its normal programming.
C) Replacement of the belt is direction oriented.
D) Replace only the individual component that has been damaged in the belt.

Question 17

The variator assembly should be replaced in all of the following conditions except:

A) sheave damage.
B) drive belt wear.
C) shaft damage.
D) transmission fluid contamination.

Question 18

Tech A states that fluid pressure in a CVT should be checked with a transmission pressure gauge. Tech B states that pressures in a CVT will often exceed the range of a traditional gauge and will require the use of a pressure transducer. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 19

Tech A states that when replacing a CVT belt the sheaves should be checked for wear. Tech B states that the bearings might require replacement when replacing the belt. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 20

Tech A states that a CVT belt must be installed in the correct direction or the transmission will slip. Tech B states that CVT belts are lubricated using splash lubrication from the transmission case. Who is correct?

A) Tech A
B) Tech B
C) Both A and B
D) Neither A nor B

Question 21

Most CVT transmissions operate at higher pressures than a traditional transmission.

Question 22

A scan tool may not display the proper pressures during a CVT transmission diagnosis.

Question 23

Technician A says that a traditional transmission can operate at pressures that can be tested with a normal transmission pressure gauge. Technician B says that a CVT transmission needs a pressure transducer and a DSO to view pressures. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 24

A CVT drive belt is being inspected when the transmission is being disassembled. Technician A says that a worn belt can be the cause of a slipping transmission. Technician B says that if a belt shows signs of wear, it doesn't necessarily need to be replaced. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 25

A CVT belt should be inspected for wear around the edges.

Question 26

Technician A says that a sheave should be inspected for any wear marks. Technician B says that if there are any groves in a sheave it can cause the belt to get stuck on the groove. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 27

Technician A says that a typical CVT belt can cost up to $750. Technician B says that when disassembling a sheave, if the fluid is badly contaminated, the entire variator assembly should be rebuilt. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 28

After reassembling a CVT transmission, the adaptive memory must be reset.

Question 29

A special output spring compressor should be used to compress the sheave and spring completely when replacing a CVT belt.

Question 30

Technician A says that a belt can fall apart during installation, requiring a time-consuming process to reassemble. Technician B says that if the belt is damaged during assembly, it is ok to use as it is new. Who is correct?

A) Technician A
B) Technician B
C) Both technicians
D) Neither technician

Question 31

Technician A says continuous variable transmissions may use two variable diameter pulleys rather than gears to change ratio. Technician B says a hybrid vehicle may use a parallel hybrid transmission, in which either the engine or an electric motor can power the transmission. Which technician is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 32

Technician A says most manufacturers use a limited number of multi-disc clutch packs and a set of planetary gears to allow the continuously variable transmission (CVT) to operate in reverse. Technician B says some hybrid transmissions use planetary gear sets to create a two-speed CVT. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 33

Which of the following is not a type of continuously variable transmissions (CVT) used in production vehicles?

A) Electronic continuously variable transmission (CVT)
B) Variable-diameter pulley CVT
C) Toroidal or roller based CVT
D) Constant torque adjusting CVT

Question 34

Technician A says the electronic continuously variable transmission is used in Toyota and Ford hybrid vehicles. Technician B says the variable-diameter pulley continuously variable transmission (CVT) is the most common type of CVT being used in vehicles today. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 35

Technician A says some manufacturers have programmed into the power train control module (PCM) regular shift points for their continuously variable transmission (CVT), at which the pulley sheaves will move to predetermined positions to create the feel of separate conventional shifts. Technician B says some manufacturers allow the driver to manually shift through these predetermined pulley diameters while driving the vehicle. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 36

Technician A says most manufacturers use a multi-disc clutch pack and a set of planetary gears to allow the continuously variable transmission (CVT) to operate in reverse. Technician B says Ford Motor Company uses these planetary gear sets to create a two-speed CVT. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 37

In a Continuously Variable Transmission (CVT), what changes in a smooth step-less progression to suit speed and load conditions.

A) Gear ratios
B) Torque converter clutch operation
C) Travel direction
D) None of the above

Question 38

Which of the following is improved because a Continuously Variable Transmission (CVT) permits the engine to operate in its most efficient operating rpm range?

A) Fuel economy
B) Torque capacity
C) Vehicle performance
D) Both A and C

Question 39

A Continuously Variable Transmission (CVT) has fixed gear ratios.

Question 40

Continuously Variable Transmissions (CVTs) require a special type of transmission fluid.

Question 41

Most manufacturers of hybrid vehicles use a limited number of multi-disc clutch packs and a set of planetary gears to allow the transmission to operate in ________.

A) Efficiency mode
B) Reverse
C) Forward
D) Neutral

Question 42

Technician A says that Variable Diameter Pulley (VDP) Continuously Variable Transmissions (CVT) are commonly rebuilt. Technician B says that VDP CVT's require more frequent fluid changes than a conventional automatic transmission. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 43

Technician A says that Variable Diameter Pulley (VDP) Continuously Variable Transmissions (CVT) will often have a planetary gear set to produce reverse. Technician B says that many CVTs in vehicles use a rubber drive belt between two pulleys to transfer power. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 44

Technician A says a variable-diameter pulley (VDP) system operates using two variable diameter pulleys with either a steel or a rubber belt between them. Technician B says the rubber belt has a limited service life in an automobile, so most manufacturers use them. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 45

Technician A says typically, a variable-diameter pulley (VDP) gear ration is 3:1 through the pulleys from a dead stop. Technician B says as the vehicle gains speed, the input pulley diameter increases, while the output pulley diameter decreases. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 46

Which of the following ratios is the maximum overdrive between the pulleys of a variable-diameter pulley (VDP) transmission?

A) 1:01
B) 1:02
C) 2:01
D) 0.2:1

Question 47

Technician A says belt tension on a variable-diameter pulley (VDP) is maintained by a large spring on the output shaft pulley. Technician B says the tension spring causes the sheaves of the output pulley to be close together, creating a larger diameter pulley. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 48

Technician A says some manufacturers have programmed into the Powertrain Control Module (PCM) regular shift points for their continuously variable transmission (CVT), at which the pulley sheaves will move to predetermined positions to create the feel of separate conventional shifts. Technician B says some manufacturers allow the driver to manually shift through these predetermined pulley diameters while driving the vehicle. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 49

Technician A says most manufacturers recommend repairing internal components of a continuously variable transmission (CVT). Technician B says specialty tools are required to compress the output pulley and reinstall the belt on most CVTs. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 50

Technician A says the steel belt used in a continuously variable transmission (CVT) is made up of hundreds of transversely mounted steel plates that are held in place with several steel bands. Technician B says the transverse steel plates slip on the sides of the pulley and in turn are pushed by the pulley. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 51

Technician A says the longitudinal steel bands in a continuously variable transmission (CVT) are used to hold the belt together and keep the steel plates lined up. Technician B says these bands used in a CVT hold the plates closely together in a very strong and flexible ring. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 52

Which of these is likely to be used in a modern variable pulley continuously variable transmission (CVT)?

A) Steel belt
B) Rubber belt
C) Neoprene belt
D) None of the above

Question 53

Technician A say the most common type of continuously variable transmission (CVT) today is the variable-diameter pulley transmission. Technician B says the variable-diameter pulley (VDP) has two pulleys with movable drive faces that can be adjusted to change the pulley's effective diameter. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 54

Technician A say the most common type of continuously variable transmission (CVT) today is the variable-diameter pulley transmission. Technician B says the variable-diameter pulley (VDP) transmission has two pulleys that are in direct contact with each other. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 55

Technician A says the longitudinal steel bands in a variable pulley diameter style continuously variable transmission (CVT) are used to hold the belt together and keep the steel plates lined up. Technician B says these bands hold the plates apart so there is a large gap maintained between each plate. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 56

Technician A says the steel belt used in a variable diameter pulley continuously variable transmission (CVT) is made up of hundreds of transversely mounted steel plates that are held in place with several steel bands. Technician B says the transverse steel plates slip on the sides of the pulley and in turn are pulled by the pulley. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 57

Technician A says most manufacturers recommend repairing internal components of their continuously variable transmissions (CVTs). Technician B says specialty tools are required to compress the output pulley and reinstall the belt on most CVTs. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 58

Technician A says a variable-diameter pulley (VDP) system operates using two variable diameter pulleys with either steel or a rubber belt between them. Technician B says the rubber belt operates much quieter than a steel belt, so most vehicle manufacturers use them. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 59

Technician A says typically, a variable-diameter pulley (VDP) gear ratio is 3:1 through the pulleys from a dead stop. Technician B says as the vehicle gains speed, the input pulley diameter increases, while the output pulley diameter decreases. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 60

Which of the following is most likely an overdrive gear ratio for a variable-diameter pulley (VDP) system?

A) 1:1 gear ratio
B) 1:2 gear ratio
C) 2:1 gear ratio
D) 0.2:1 gear ratio

Question 61

Technician A says belt tension on a variable-diameter pulley (VDP) system is maintained by a large spring on the output shaft pulley. Technician B says the tension spring on a variable-diameter pulley (VDP) system causes the sheaves of the output pulley to be close together, creating a larger diameter pulley. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 62

Which of these is not used in a continuously variable transmission (CVT)?

A) Steel belt
B) Rubber belt
C) Nylon belt
D) None of the above

Question 63

Early continuously variable transmissions, known as ECVT, are not suitable for hybrid vehicle applications.

Question 64

Which type of continuously variable transmission operates using two variable-diameter pulleys with either a steel or rubber belt between them?

A) Electronic continuously variable transmission
B) Reeves drive
C) Roller based
D) None of the above

Question 65

In a variable-diameter pulley CVT, each of the pulleys has two movable drive faces called ________.

A) Pulleys
B) Sheaves
C) Rollers
D) Gear sets

Question 66

Technician A says that Variable Diameter Pulley (VDP) Continuously Variable Transmissions (CVT) are commonly rebuilt. Technician B says that VDP CVT's require regular fluid changes. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 67

Technician A says that some Continuously Variable Transmissions (CVT's) require a heating system to warm the transmission fluid during cold weather operation. Technician B says that CVT's are able to create an infinite number of gear ratios between their minimum and maximum ratio. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 68

Technician A says that Variable Diameter Pulley (VDP) Continuously Variable Transmissions (CVT) will often have a planetary gear set to produce reverse. Technician B says that many CVT's in vehicles use a rubber drive belt between two pulleys to transfer power. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 69

Technician A says the toroidal continuously variable transmission (CVT) is limited in production because of high manufacturing cost. Technician B says the toroidal, or roller, design uses two curved discs, an input disc and an output disc. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 70

Technician A says the toroidal continuously variable transmission (CVT) can have a high gear ratio of approximately 4:1 to begin accelerating the vehicle. Technician B says when the rollers in a toroidal CVT are perpendicular to the input and output disc, the gear ratio is 1:1. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 71

Technician A says the toroidal continuously variable transmission (CVT) can handle larger amounts of torque than a belt-driven CVT. Technician B says toroidal CVTs use special transmission fluid to prevent wear to the rollers. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 72

Technician A says the toroidal continuously variable transmission (CVT) cannot handle as high an amount of torque as a belt-driven CVT. Technician B says toroidal CVTs use special transmission fluid to prevent wear to the rollers. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 73

Technician A says the toroidal continuously variable transmission (CVT) can have a high gear ratio of approximately 4:1 to begin accelerating the vehicle. Technician B says when the rollers in a toroidal CVT are perpendicular to the input and output disc, the gear ratio is 1:1. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 74

Technician A says the toroidal continuously variable transmission (CVT) is limited in production because of high manufacturing cost. Technician B says the toroidal, or roller, design uses four curved discs - two input discs and two output discs. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 75

In the Toroidal Continuously Variable Transmission (CVT) design, power is transferred from the input disc to the output disc through a set of variable-angle _______.

A) Pulleys
B) Sheaves
C) Rollers
D) Gear sets

Question 76

Technician A says that the transmission in a Toyota hybrid has a separate gear to provide reverse. Technician B says that Toyota hybrids use a VDP CVT transmission. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 77

Technician A says most manufacturers use a limited number of multi-disc clutch packs and a set of planetary gears to allow the continuously variable transmission (CVT) to operate in reverse. Technician B says some hybrid transmissions use planetary gear sets to create a two-speed CVT. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 78

Which of the following transmissions typically has no fixed gear ratios?

A) Conventional automatic transmission
B) Manual transmission
C) Continuously variable transmission
D) Dual clutch transmission

Question 79

Technician A says the electronic continuously variable transmission is used in Toyota and Ford hybrid vehicles. Technician B says the variable-diameter pulley continuously variable transmission (CVT) is the most common type of CVT being used in vehicles today. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B

Question 80

Technician A says some manufacturers have programmed into the power train control module (PCM) regular shift points for their continuously variable transmission (CVT), at which the pulley sheaves will move to predetermined positions to create the feel of separate conventional shifts. Technician B says some manufacturers allow the driver to manually shift through these predetermined pulley diameters while driving the vehicle. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B