Examkin

Question

Difficulty: MediumUpshifting and Double Clutching

A freight driver is shifting an unsynchronized transmission to a higher gear. After moving the gear selector to neutral and releasing the clutch pedal, what action must the driver take to complete the upshift successfully?

  1. A
    Press the accelerator to increase engine RPM, push the clutch pedal to the floor, and pull the lever into the higher gear.
  2. Allow engine RPM to decrease to the speed needed for the higher gear, depress the clutch, shift into gear, and release the clutch while applying throttle.Answer
  3. C
    Depress the clutch pedal completely to the floor to engage the clutch brake, force the lever into the higher gear, and release the pedal.
  4. D
    Pull the shift lever directly into the higher gear without pressing the clutch pedal again, then abruptly accelerate.

Answer

Allow engine RPM to decrease to the speed needed for the higher gear, depress the clutch, shift into gear, and release the clutch while applying throttle.
When executing an upshift with an unsynchronized manual transmission, the higher gear requires a lower engine speed for the same vehicle road speed. After releasing the clutch pedal in neutral, the driver must allow engine RPM and input shaft speed to drop to the matching level, depress the clutch pedal a second time, move the shift lever into the higher gear, and smoothly release the clutch while applying accelerator pressure.

Step-by-Step Solution

1
Understand gear ratio requirements during an upshift.
Higher gear ratios operate at lower engine RPMs for the same road speed.
An upshift requires engine speed and input shaft speed to decelerate to achieve mechanical synchronization.
2
Allow engine and gear rotational speeds to drop while the transmission is in neutral with the clutch released.
Engine RPM falls to match the rotational speed of the target higher gear.
Releasing the clutch in neutral connects the transmission input shaft to the slowing engine, synchronizing both components.
3
Depress the clutch pedal, move the lever into the higher gear, and release the clutch while pressing the accelerator.
The vehicle smoothly engages the higher gear without grinding.
This completes the second stage of the standard double-clutching procedure outlined in commercial driver operating standards.

Key Concept

Basic double-clutching procedure for upshifting in manual transmissions
Estimated Time:1m 0s
Rate this question

Topics

Upshifting and Double Clutching

More questions from this topic