Heavy Duty Truck Systems - Chapter 15

Which of the following gear ratios indicates the most amount of overdrive?

0.64:1

When sliding gearshift mechanisms are used, which gears do they control?

all the above

Which of the following is true of a twin-countershaft standard transmission?

all the above

Which of the following statements is true regarding the function of a transfer case?

all the above

Which of the following statements is/are correct about geartrains?

all the above

To provide for overdrive gearing in the high- and low-auxiliary transmission ranges, which of the following components is added to the basic range-shift air control system?

both a splitter cylinder and a button-actuated shift lever valve

What component retains a shift rail in position following a shift?

detent ball

Which of the following components in a typical heavy-duty, twin-countershaft transmis-sion could be described as floating?

main shaft

Which type of transmission requires double-clutching between shifts?

nonsynchronized

An auxiliary mechanical drive for truck accessories driven by the transmission is known as a(n):

power take-off (PTO) unit

When an idler gear is placed between the driving and driven gear, the driven gear:

rotates in the same direction as the driving gear

In a range shift air control system, which component distributes inlet air pressure to both the low- and high-range air hoses running to the range cylinder?

slave valve

Which type of gear is more likely to develop gear whine at higher speeds?

spur gear

The component used to ensure that the main shaft and the main shaft gear about to be locked to it are rotating at the same speed is known as a:

synchronizer

Which of the following is the most widely used standard transmission geartrain arrange-ment in heavy-duty trucks?

twin countershaft