Mixed Deck — All NCT Topics Flashcards

Which provision of the Clean Air Act requires states to develop State Implementation Plans (SIPs) that directly affect stationary source emission limits and filtration requirements?

Answer: Title I, Part D — Non-attainment Area Requirements

Title I Part D requires states in non-attainment areas to develop SIPs with emission reduction strategies, imposing stricter controls on stationary sources including filtration systems.

A fleet risk assessment reveals high telematics-recorded harsh-braking events concentrated on a specific route segment. The MOST targeted mitigation is to:

Answer: Investigate the route segment for signage, grade, or sight-line issues

Concentrated harsh-braking at a route segment suggests a road condition or design issue that should be identified and corrected at the source.

Which of the following refrigerants is classified as A2L (mildly flammable) and is a primary component in next-generation low-GWP systems?

Answer: R-32

R-32 is an A2L mildly flammable refrigerant with a GWP of 675 and is a key component in low-GWP systems like R-454B, replacing R-410A in new equipment.

Under the Kigali Amendment to the Montreal Protocol, which class of substances is being phased down globally?

Answer: HFCs (hydrofluorocarbons)

The Kigali Amendment, adopted in 2016, established a global phasedown schedule for HFCs due to their high global warming potential.

NFPA 90A covers the installation of air-conditioning and ventilating systems. What is the primary fire safety function of a listed combination fire/smoke damper in a duct system?

Answer: Prevent fire and smoke from spreading through duct penetrations

Combination fire/smoke dampers close automatically to block both the passage of flames and smoke through rated fire-resistance assemblies penetrated by ductwork.

Under OSHA's Hazard Communication Standard (HazCom / 29 CFR 1910.1200), what information must a technician review before changing filters in a system handling a regulated chemical process?

Answer: Safety Data Sheets (SDS) for chemicals that may have accumulated on the spent filters

HazCom requires workers to consult SDS for any hazardous chemicals they may be exposed to, including residues on spent filters from chemical processes.

In fleet quality management, a 'nonconformance' is BEST defined as:

Answer: Any output or condition that does not meet a defined requirement or standard

A nonconformance is any instance where a product, service, or process fails to meet specified requirements, triggering corrective action.

Why is it important to check the compressor during troubleshooting?

Answer: To ensure the refrigerant flow is maintained.

Checking the compressor during troubleshooting is vital because it is the heart of the refrigeration cycle, responsible for circulating refrigerant and maintaining pressure differences. A malfunctioning compressor can prevent proper refrigerant flow, leading to inadequate cooling or heating, and potentially system failure.

An organization implements error-proofing on its parts cage so that a technician physically cannot check out the wrong fluid type for a specific vehicle. This is an example of:

Answer: Poka-yoke (mistake-proofing)

Poka-yoke devices or systems physically prevent errors from occurring, eliminating the possibility of a mistake rather than just detecting it.

How should an NCT professional approach a novel situation not covered by standard procedures?

Answer: Apply foundational principles, assess risks, consult resources, and document decisions

Novel situations require applying core principles, careful risk assessment, resource consultation, and thorough documentation of the rationale for decisions made.

A pulse-jet cleaned cartridge filter fails to clean properly and differential pressure keeps rising. What component is most likely malfunctioning?

Answer: Pulse valve or compressed air supply to the cleaning system

Pulse-jet cleaning depends on properly functioning pulse valves and adequate compressed air supply; failure of either prevents effective cake removal.

A telematics report identifies a vehicle with consistently high 'engine load' readings at low vehicle speeds. What fleet maintenance insight does this suggest?

Answer: A potential drivetrain, brake drag, or accessory load issue that increases engine work demand

High engine load at low speed suggests the engine is working harder than expected, which can indicate brake drag, excessive accessory loads, drivetrain binding, or transmission slippage.

A fleet maintenance shop wants to reduce vehicle inspection time without sacrificing thoroughness. Which Lean tool would BEST help redesign the inspection workflow?

Answer: Value stream mapping

Value stream mapping visually documents every step in a process, exposing bottlenecks and non-value-added steps that can be eliminated or streamlined.

What is the role of certified technicians in refrigerant management?

Answer: They handle refrigerants in compliance with environmental laws.

Certified technicians are crucial in refrigerant management as they possess the knowledge and skills to handle refrigerants in compliance with strict environmental laws and regulations. Their certification ensures they can safely recover, recycle, and dispose of refrigerants, preventing harmful releases and protecting the environment.

What parameter does a manifold gauge set's compound (low-side) gauge measure that a standard pressure gauge cannot?

Answer: Both pressure and vacuum (inches of mercury)

A compound gauge reads both positive pressure and vacuum below atmospheric pressure (in inches of mercury), essential for system evacuation verification.

A HVAC technician finds microbial growth on the downstream side of a cooling coil filter. What maintenance action is most appropriate?

Answer: Replace the filter and disinfect the downstream surfaces

Microbial growth on downstream surfaces requires both filter replacement and disinfection of contaminated ductwork to prevent continued proliferation.

According to NAFA installation standards, what is the maximum recommended face velocity for a standard 2-inch pleated panel filter?

Answer: 500 FPM

Standard 2-inch pleated panel filters are typically rated for face velocities up to 500 FPM; exceeding this can cause media deformation and increased particle penetration.

Which communication protocol is most commonly used by modern telematics devices to transmit vehicle data to a fleet management platform?

Answer: Cellular (4G/LTE)

Modern telematics units use cellular networks (4G/LTE) to transmit vehicle data in real time to cloud-based fleet management platforms.

When performing a key programming procedure on a modern fleet vehicle, which tool is typically required in addition to a scan tool?

Answer: A factory-level or OEM-equivalent immobilizer programmer

Key programming and immobilizer functions require a factory-level or OEM-equivalent programmer because these security functions are not accessible through generic scan tools.

A fleet manager wants to predict next year's maintenance budget. Which analytical approach is MOST appropriate?

Answer: Regression analysis using multiple years of historical cost data

Regression analysis uses historical data to identify trends and relationships that produce statistically grounded future cost predictions.