Question 1

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

Accepted Answer

Nylon belts are not typically used in CVTs. CVTs commonly use steel belts or chains for durability and strength.

Question 2

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

Accepted Answer

In a CVT, the gear ratios change in a smooth, step-less progression to match the speed and load conditions, unlike traditional transmissions with fixed gear ratios.

Question 3

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

Accepted Answer

A CVT improves fuel economy and vehicle performance by allowing the engine to run at its most efficient rpm, optimizing power delivery and efficiency.

Question 4

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 ________.

Accepted Answer

Hybrid vehicle transmissions use multi-disc clutch packs and planetary gears to enable the vehicle to operate in reverse.

Question 5

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?

Accepted Answer

Technician B is correct because VDP CVTs typically require more frequent fluid changes due to the specific demands and design of the transmission system. Technician A is incorrect as VDP CVTs are not commonly rebuilt; they are often replaced instead.

Question 6

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?

Accepted Answer

Many CVTs use a planetary gear set to produce reverse, while rubber drive belts are not typically used in automotive CVTs.

Question 7

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?

Accepted Answer

Traditional transmissions can be tested with a normal pressure gauge, while CVT transmissions often require a pressure transducer and a digital storage oscilloscope (DSO) for accurate pressure readings.

Question 8

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?

Accepted Answer

A worn CVT drive belt can cause slipping in the transmission, so it should be replaced if it shows signs of wear.

Question 9

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?

Accepted Answer

Both technicians are correct. Technician A is right that a sheave should be inspected for wear marks, and Technician B is correct that grooves can cause the belt to get stuck.

Question 10

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?

Accepted Answer

The answer of Technician A says that a typical CVT...

Question 11

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?

Accepted Answer

Technician A is correct because a belt can indeed fall apart during installation, and it would require reassembly. Technician B is incorrect because using a damaged belt, even if new, is not advisable as it can lead to further issues.

Quiz 21: Continuously Variable Transmissions

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

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