LEC Suspension & Steering 2

Question 1

What is the primary function of the equalizer bar in a locomotive truck suspension?

Accepted Answer

To distribute weight evenly between adjacent axles

Answer

The equalizer bar connects adjacent axle journals and redistributes weight so both axles share the load more evenly over uneven track.

Question 2

Which condition would most likely cause hunting oscillation in a locomotive at speed?

Accepted Answer

Worn wheel flanges and excessive flange clearance

Answer

Worn wheel profiles with excessive clearance reduce the self-centering conicity effect, allowing the wheelset to hunt (oscillate laterally) at higher speeds.

Question 3

A locomotive's truck is said to have 'rock and roll' motion. What does this describe?

Accepted Answer

Combined lateral rocking and vertical rolling of the car body

Answer

Rock and roll refers to simultaneous lateral (rocking) and rotational (rolling) oscillation of the locomotive body on its suspension.

Question 4

What is the purpose of the snubber (or friction damper) in a locomotive suspension system?

Accepted Answer

To dampen vertical oscillations and prevent excessive bouncing

Answer

Snubbers provide friction or hydraulic damping to dissipate energy from spring oscillations, preventing the locomotive from bouncing excessively.

Question 5

During a pre-departure inspection, you notice one side of the locomotive body is visibly lower than the other. What is the most likely cause?

Accepted Answer

Failed or collapsed suspension spring on the low side

Answer

A broken or collapsed suspension spring on one side removes its load-bearing contribution, causing that corner of the locomotive body to sink lower.

(LEC) Locomotive Engineer Certification Practice Test

(LEC) Locomotive Engineer Certification Practice Test

LEC Suspension & Steering 2