Question 1

Vacuum modulators can be replaced without removing the transmission from the vehicle.

Accepted Answer

Vacuum modulators are typically mounted externally on the transmission, allowing them to be replaced without removing the entire transmission from the vehicle.

Question 2

Some vacuum modulators are adjustable.

Accepted Answer

Some vacuum modulators are designed to be adjustable to allow for fine-tuning of the transmission's shift points and performance.

Question 3

If transmission fluid is drawn into the engine through a leaking vacuum modulator, what colour will the smoke in the exhaust be?

Accepted Answer

The answer of If transmission fluid is drawn into the...

Question 4

When adjusting a vacuum modulator, adjustments should be made in small increments to prevent shifting problems.

Accepted Answer

Adjusting a vacuum modulator in small increments ensures precise control over transmission shifting, preventing potential issues from large, abrupt changes.

Question 5

If the vacuum modulator's diaphragm becomes ripped, the customer may report that the vehicle shift is extremely delayed and harsh, often shifting only at the engine red line, regardless of the driving condition or throttle position.

Accepted Answer

A ripped vacuum modulator diaphragm can cause a loss of vacuum signal to the transmission, leading to delayed and harsh shifting as the transmission relies on this signal to determine shift timing.

Question 6

Engine vacuum, atmospheric pressure and spring tension all work on the vacuum modulator diaphragm. Which of the following statements describes the action of these forces on the diaphragm?

Accepted Answer

As manifold vacuum decreases, the spring extends, increasing modulator pressure, because the spring pushes against the diaphragm more as vacuum decreases.

Question 7

Technician A says that reciprocating force controls governor pressure. Technician B says that centrifugal force controls governor pressure. Who is correct?

Accepted Answer

Centrifugal force controls governor pressure in automatic transmissions, as it is related to the speed of the vehicle.

Question 8

Technician A says that modifying governor weights will alter transmission shifting. Technician B says that excessive modification of the governor weights may cause the transmission to not shift. Who is correct?

Accepted Answer

Both technicians are correct. Modifying governor weights can change the shift points of a transmission, and excessive modification can prevent it from shifting properly.

Question 9

An automatic transmission's governor is free to spin inside a precision bore that is lubricated with ______.

Accepted Answer

The governor in an automatic transmission is lubricated with transmission fluid, which is specifically designed for the components within the transmission system.

Question 10

At the inboard end of the automatic transmission's governor, there is a gear that engages with another gear that is pressed onto the output shaft.

Accepted Answer

The governor in an automatic transmission is typically connected to the output shaft and uses gears to measure vehicle speed, which helps in determining the appropriate gear shifting.

Question 11

In a hydraulically controlled transmission, how is vehicle speed measured?

Accepted Answer

The answer of In a hydraulically controlled transmission, how is...

Question 12

If vehicle speed decreases, governor pressure is reduced, resulting in the shift valve moving back to the downshift position.

Accepted Answer

Governor pressure is directly related to vehicle speed; as speed decreases, governor pressure decreases, causing the shift valve to move to the downshift position.

Question 13

If a vehicle is coasting in third gear, governor pressure ________ as the vehicle speed drops, causing the 2-3 shift valve to move back to the downshift position.

Accepted Answer

Governor pressure reduces as the vehicle speed drops, causing the 2-3 shift valve to move back to the downshift position.

Question 14

Which of the following governor designs is most precise across a wide range of road speeds?

Accepted Answer

Staged governors are designed to provide precise control over a wide range of speeds by using multiple stages to adjust to varying conditions, making them more precise than other types.

Question 15

Which of the following is typically calibrated to a particular engine on a governor?

Accepted Answer

The springs behind the governor's weights are typically calibrated to a particular engine to ensure the governor maintains the desired engine speed by adjusting the tension on the weights.

Question 16

Which of the following could cause a governor valve to operate improperly if not cleaned out of the governor assembly during servicing or overhaul?

Accepted Answer

Dirt, old clutch material, and issues with the governor screen can all cause a governor valve to operate improperly if not cleaned during servicing or overhaul.

Question 17

Which of the following typically may need to be replaced during the servicing of a governor assembly?

Accepted Answer

Governor filters typically need to be replaced during the servicing of a governor assembly to ensure proper filtration of the oil and prevent contamination.

Question 18

Which of the following is a typical high-performance modification made to the transmissions governor?

Accepted Answer

The answer of Which of the following is a typical...

Question 19

Typically, a directly mounted governor to the output shaft has how many valves?

Accepted Answer

A directly mounted governor can have either one or two valves, depending on the design and application requirements.

Question 20

Which of the following governor designs uses two valves: a primary valve and a secondary valve?

Accepted Answer

The staged governor design uses two valves: a primary valve and a secondary valve, to control the flow and pressure in stages.

Quiz 10: Hydraulically Controlled Transmission