Question 1

What is another name for an apply chart?

Accepted Answer

The answer of What is another name for an apply...

Question 2

To which of the following should a technician compare transmission operation during a test drive in order to help isolate the transmission concern?

Accepted Answer

A clutch application chart provides detailed information on how the transmission should operate under various conditions, which can help the technician identify any discrepancies during a test drive.

Question 3

Which of the following gear reductions would you get having a smaller input gear with 8 teeth driving a larger output gear with 24 teeth?

Accepted Answer

The answer of Which of the following gear reductions would...

Question 4

Technician A says if a servo piston has approximately 3 square inches (49 square mm) of surface area, and hydraulic pressure of 150 psi (1034 kPapplied to it, then it can deliver approximately 450 pounds (204 kg) of force. Technician B says that the pressure applied would be 50lbs (23 kg) Who is correct?

Accepted Answer

Technician A is correct because force is calculated by multiplying pressure by area. With 150 psi applied to 3 square inches, the force is 450 pounds (150 psi * 3 in² = 450 lbs).

Question 5

Comparing observations made on the test drive to clutch and band apply charts can aid the technician in choosing which additional tests will best help diagnose the failure.

Accepted Answer

Comparing observations to clutch and band apply charts helps identify discrepancies and narrow down potential issues, guiding further diagnostic tests.

Question 6

Technician A says to obtain a direct drive or 1:1 gear ratio, the transmission locks together any two members of the planetary gear set. Technician B says to obtain reverse in a planetary set, the ring gear is attached to the output shaft and the planet carrier is held stationary. Who is correct?

Accepted Answer

Both technicians are correct. Technician A is correct because to obtain a direct drive or 1:1 gear ratio, the transmission locks together any two members of the planetary gear set. Technician B is correct because to obtain reverse in a planetary set, the ring gear is attached to the output shaft and the planet carrier is held stationary.

Question 7

Technician A says that band and clutch application charts can help to diagnose faults in transmissions. Technician B says that 100 psi of pressure on a 2-square-inch piston results in 50 lb of force. Who is correct?

Accepted Answer

Technician A is correct because band and clutch application charts are useful tools for diagnosing transmission faults. Technician B is incorrect because 100 psi on a 2-square-inch piston results in 200 lb of force, not 50 lb.

Question 8

Technician A states that when diagnosing an automatic transmission problem, it is important to first verify the customer complaint by taking the vehicle on a road test, if possible. Technician B states that after one has verified the customer complaint, one should pay attention and document when the problem occurs. Who is correct?

Accepted Answer

Both Technician A and Technician B are correct. Technician A is right in stating that verifying the customer complaint through a road test is an important first step in diagnosing transmission issues. Technician B is also correct in emphasizing the importance of documenting when the problem occurs after verifying the complaint, as this information is crucial for accurate diagnosis and repair.

Question 9

All of the following are advantages of using the clutch and band application charts EXCEPT:

Accepted Answer

The clutch and band application charts help in diagnosing faults, estimating costs, and deciding if the transmission needs to be removed, but they do not determine if the transmission does not need repair.

Question 10

A manufacturer's clutch and band application chart is sometimes referred to as a _______ chart.

Accepted Answer

The answer of A manufacturer's clutch and band application chart...

Question 11

Using the manufacturer's chart, we can start our diagnosis of a failed transmission:

Accepted Answer

The manufacturer's chart is typically used to diagnose issues before taking apart or removing the transmission, allowing for a more efficient troubleshooting process.

Question 12

If there is a problem in obtaining park, it could be due to:

Accepted Answer

The answer of If there is a problem in obtaining...

Question 13

The vehicle has no reverse but moves forward. The transmission seems to drive forward fine. The transmission holds on deceleration in first. Which of these could cause the problem?

Accepted Answer

The reverse input clutch is responsible for engaging the reverse gear. If it is faulty, the vehicle will not be able to move in reverse, even if it moves forward fine.

Question 14

Everything seems to be working fine but the vehicle is not going into neutral. Where could the problem be?

Accepted Answer

The shift solenoid is responsible for controlling the flow of transmission fluid to change gears, including shifting into neutral. If it is malfunctioning, the vehicle may not shift into neutral properly.

Question 15

A transmission has no reverse but seems to drive forward fine. Technician A states that the problem could be with the 2-3 shift solenoid. Technician B states that the problem could be with the 1 2 shift solenoid. Who is correct?

Accepted Answer

The issue is likely not related to the 2-3 or 1-2 shift solenoids, as these are involved in forward gear shifting, not reverse. The problem could be with the reverse gear mechanism or solenoid.

Question 16

Technician A says that accumulators are used to filter contaminates. Technician B says that accumulators are used to soften clutch engagement. Who is correct?

Accepted Answer

Accumulators are used in hydraulic systems to soften clutch engagement by absorbing shocks and providing smoother operation. They are not used to filter contaminants.

Question 17

Which of the following are used to dampen the application of clutches and bands by increasing the circuit volume during the shift?

Accepted Answer

Accumulators are used to dampen the application of clutches and bands by temporarily storing hydraulic fluid, thus increasing the circuit volume during the shift and smoothing the engagement.

Question 18

Which of the following hydraulic circuits will usually contain an accumulator to prevent harsh shifts?

Accepted Answer

An accumulator is typically used in brake and clutch hydraulic circuits to absorb shock and prevent harsh shifts by smoothing out pressure fluctuations.

Question 19

Automatic transmission accumulators are composed of a spring-loaded piston within a bore.

Accepted Answer

Automatic transmission accumulators typically consist of a spring-loaded piston within a bore, which helps to absorb pressure fluctuations and smooth out gear shifts.

Question 20

Accumulators are used to:

Accepted Answer

Accumulators are used to dampen the application of clutches and bands by absorbing some of the hydraulic pressure, which helps to smooth out the engagement and disengagement process.

Quiz 8: Hydraulic Fundamentals