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Exam 21: Continuously Variable Transmissions

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Question 61

Multiple Choice

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The variable-diameter pulley CVT:

A) As the vehicle gains speed, the input pulley diameter increases while the output pulley diameter decreases.
B) As the vehicle gains speed, the input pulley diameter decreases while the output pulley diameter increases.
C) Prevents high torque multiplication.
D) Has no effect on the gear ratio.

E) All of the above
F) B) and C)

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Question 62

Multiple Choice

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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.

E) All of the above
F) None of the above

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Question 63

Multiple Choice

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

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

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?

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?

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?

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?

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?

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 CVT belt should be inspected for wear around the edges.

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?

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?

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?

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

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

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

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?

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?

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?