Certification Practice Exam Questions

Transit Railcar Maintenance Technician Certification Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of the traction motor in a railcar?
• To control lighting circuits
• To convert electrical energy into mechanical energy for propulsion
• To monitor brake pressure
• To supply air for pneumatic systems

Rationale: The traction motor transforms electrical energy from the power

source into mechanical motion, driving the axles for railcar movement.

• Which component maintains air pressure for braking and door operation?
• Air compressor
• Battery charger 1 / 4

• Pantograph
• Inverter

Rationale: The air compressor generates compressed air for pneumatic

systems, including brakes and doors.

• What is the primary function of a pantograph?
• To distribute 24V DC power
• To collect electrical power from the overhead wire
• To cool the traction motors
• To store kinetic energy

Rationale: Pantographs connect with overhead catenary wires to draw

electrical current for train operation.

• What type of current is typically supplied through third rail systems?
• Direct current (DC)
• Alternating current (AC)
• Three-phase current
• Pulsed DC

Rationale: Third rail systems usually supply DC power, commonly at 600–750

volts.

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• Which of the following is a common symptom of worn brake pads?
• Increased acceleration
• Reduced current draw
• Longer stopping distance
• Decreased traction effort

Rationale: Worn brake pads reduce friction, extending the stopping distance.

• What tool measures electrical resistance?
• Ammeter
• Voltmeter
• Ohmmeter
• Tachometer

Rationale: An ohmmeter measures resistance in ohms within electrical

circuits.

• What is the standard voltage for control circuits in most modern railcars?

A. 600V

B. 120V

C. 24V DC

D. 480V

Rationale: Control systems operate at 24V DC for safety and reliability.

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8. The function of a relay in a railcar circuit is to:

• Measure voltage
• Increase resistance
• Control high-current circuits using low-current signals
• Convert AC to DC

Rationale: Relays allow control of heavy loads through smaller control

currents.

• What is the most likely result of a leaking air line in the brake system?
• Reduced propulsion power
• Decreased braking performance
• Overheating traction motors
• Door malfunction

Rationale: Air leaks lower system pressure, reducing brake effectiveness.

10. The wheel flange helps prevent:

• Noise
• Derailment
• Vibration
• Flat spots

Rationale: The flange keeps the wheel aligned on the rail, preventing

derailment.

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