Week #1 - RoadRanger: Theory of Operation (Chapter 15)

Question 1

Which type of gear is more likely to develop gear whine at higher speeds? a. a helical gear b. a worm gear c. a spur gear d. all of the above

Answer 1

c. a spur gear

Question 2

When sliding gearshift mechanisms are used, which gears do they control? a. direct and overdrive gears in the auxiliary section b. high and low gears in the auxiliary section c. first and reverse gears in the main box d. all of the above

Answer 2

d. all of the above

Question 3

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 what?

Answer 3

Synchronizer

Question 4

Which of the following components in a typical heavy-duty, twin-countershaft transmission could be described as floating? a. the input shaft b. the output shaft c. the main shaft d. countershafts

Answer 4

c. the main shaft

Question 5

Which of the following is true of a twin-countershaft standard transmission? a. It allows the main shaft to float between the countershafts. b. It divides input torque between two separate shafts. c. It allows the face width of each gear to be reduced. d. all of the above

Answer 5

d. all of the above

Question 6

Which of the following statement is/are correct about geartrains? a. They transmit speed and torque unchanged. b. They decrease speed and increase torque. c. They increase speed and decrease torque. d. All of the above

Answer 6

d. All of the above

Question 7

Which of the following gear ratios indicates the most amount of overdrive? a. 2.15:1 b. 0.64:1 c. 0.85:1 d. 1:1

Answer 7

b. 0.64:1

Question 8

Which of the following is the most widely used standard transmission geartrain arrangement in heavy-duty trucks? a. single countershaft b. double planetary c. twin countershaft d. triple countershaft

Answer 8

c. twin countershaft

Question 9

In 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?

Answer 9

A slave valve

Question 10

Which of the following statements is true regarding the function of a transfer case? a. It transfers torque from the transmission to a front drive axle. b. It transfers torque from the transmission to the rear drive axle(s). c. It may provide an additional gear reduction in the drivetrain. d. all of the above

Answer 10

d. all of the above

Question 11

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? a. an additional slave valve b. a splitter cylinder c. a button-actuated shift lever valve d. both a and b e. both b and c

Answer 11

e. both b and c

Question 12

When the idler gear is placed between the driving and driven gear, the driven gear: a. remains stationary b. rotates in the opposite direction of the driving gear c. rotates in the same direction as the driving gear

Answer 12

c. rotates in the same direction as the driving gear

Question 13

What is an auxiliary mechanical drive from truck accessories driven by the transmission known as?

Answer 13

Power take-off (PTO) unit

Question 14

Which type of transmission requires double-clutching between shifts?

Answer 14

Nonsynchronized

Question 15

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

Answer 15

A detent ball