NAPA Automatic Transmission Systems 2

Question 1

Which valve in the valve body primarily regulates main line pressure from the pump?

Accepted Answer

Pressure regulator valve

Answer

The pressure regulator valve balances pump output against spring force to set line pressure.

Question 2

What is the main purpose of an accumulator in an automatic transmission hydraulic circuit?

Accepted Answer

Cushion clutch or band apply for smoother shifts

Answer

An accumulator absorbs part of the apply pressure briefly so the clutch or band engages gradually.

Question 3

The manual valve in the valve body is positioned by which component?

Accepted Answer

The gear selector linkage or cable

Answer

The driver's shift lever moves the manual valve through linkage to route fluid for the selected range.

Question 4

On a hydraulically controlled transmission, a throttle valve (TV) cable adjusted too loose will most likely cause what?

Accepted Answer

Early, soft upshifts

Answer

Low TV pressure reduces both line pressure and shift delay, causing early, mushy shifts that can lead to slipping.

Question 5

In a transmission with a mechanical governor, governor pressure changes in direct relation to what?

Accepted Answer

Vehicle (output shaft) speed

Answer

The governor is driven by the output shaft, so its pressure rises as road speed increases.

NAPA - National Automotive Parts Association Certified Mechanic Practice Test