LEC Locomotive Operation and Control

Question 1

What is the purpose of the throttle control on a locomotive?

Accepted Answer

Answer

The throttle control on a locomotive is the primary interface for the engineer to manage the train's speed and power output. By adjusting the throttle, the engineer controls the amount of fuel delivered to the engine, thereby increasing or decreasing the engine's RPMs and the power generated. This directly impacts the tractive effort applied to the wheels, allowing for precise control over the train's acceleration and speed.

Question 2

What is the primary function of the air brake system on a locomotive?

Accepted Answer

Answer

The air brake system is a critical safety and operational component on a locomotive and throughout the entire train. Its primary function is to apply braking force to the wheels of all cars simultaneously by releasing compressed air, which actuates brake cylinders. This system allows the engineer to control the train's speed, bring it to a stop, and maintain a controlled descent on grades, ensuring safe operation.

Question 3

How does the dynamic brake system work on a locomotive?

Accepted Answer

Answer

The dynamic brake system provides a non-friction braking method by temporarily converting the locomotive's traction motors into electrical generators. As the train moves, the kinetic energy of the train turns the motor armatures, generating electricity. This electrical energy is then dissipated as heat through large resistors on the locomotive, creating a retarding force that slows the train without wearing out the friction brakes.

Question 4

What is the purpose of the train horn?

Accepted Answer

Answer

The train horn is a crucial safety device used by locomotive engineers to audibly warn people and animals of an approaching train. It is particularly important at grade crossings, curves, and in areas with limited visibility. By sounding the horn, the engineer aims to prevent accidents and ensure the safety of anyone near the tracks, fulfilling a vital role in public safety.

Question 5

What is the purpose of locomotive speedometers?

Accepted Answer

Answer

Locomotive speedometers are essential instruments that provide the engineer with real-time information about the train's current speed. This data is critical for safe and efficient operation, allowing the engineer to maintain appropriate speeds, adhere to posted speed limits for various track sections, and manage the train's momentum effectively. Compliance with speed limits is paramount for safety and regulatory adherence, preventing derailments and other incidents.

(LEC) Locomotive Engineer Certification Practice Test

(LEC) Locomotive Engineer Certification Practice Test

LEC Locomotive Operation and Control