EVT Chassis & Drivetrain Systems 2

Question 1

What is the primary purpose of a driveshaft center support bearing on a fire apparatus with a long wheelbase?

Accepted Answer

To support and align a multi-piece driveshaft and reduce vibration

Answer

To measure driveshaft rotational speed for ABS control

Answer

To lubricate the universal joints at regular intervals automatically

Answer

To absorb torque spikes during transmission gear changes

Question 2

A fire apparatus experiences severe driveline vibration that increases with vehicle speed. The MOST likely cause is:

Accepted Answer

Worn or out-of-phase universal joints

Answer

Low transmission fluid level

Answer

Excessive engine idle speed

Answer

Incorrect tire inflation pressure

Question 3

According to NFPA 1901, what is the minimum wheelbase requirement for aerial apparatus to ensure stability during outrigger deployment?

Accepted Answer

NFPA requires a stability analysis rather than a fixed wheelbase

Answer

NFPA 1901 does not specify a minimum wheelbase for aerials

Answer

120 inches minimum wheelbase

Answer

96 inches minimum wheelbase

Question 4

What is the correct procedure for measuring the universal joint operating angle to prevent premature U-joint failure?

Accepted Answer

Use an inclinometer to measure the angle at both ends of each driveshaft section

Answer

Measure the angle at the output shaft flange only

Answer

Calculate the angle from the vehicle's published wheelbase specification

Answer

Only measure U-joint angles when the vehicle is under full load

Question 5

Which component in an automatic transmission provides multiplication of engine torque during initial vehicle acceleration?

Accepted Answer

Torque converter

Answer

Planetary gear set

Answer

Valve body

Answer

Output shaft

Question 6

A fire apparatus chassis has a tandem rear axle configuration. What is the PRIMARY advantage of this design for heavy apparatus?

Accepted Answer

Increased payload capacity by distributing weight across more axles

Answer

Improved fuel economy compared to single rear axle

Answer

Lower vehicle height for garage clearance

Answer

Reduced tire wear on all axle positions

Question 7

When performing a pre-trip inspection on a fire apparatus chassis, which chassis lubrication point is most often neglected and can cause premature failure?

Accepted Answer

Kingpin and steering knuckle grease fittings

Answer

Engine oil drain plug

Answer

Fifth wheel plate (if equipped)

Answer

Transmission fluid dipstick