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Quizzes > Science

FDNY A-35 Practice Test: Air Compressor Knowledge Check

Quick A-35 air compressor quiz with instant results and smart review tips.

Editorial: Review CompletedCreated By: Cesia IglesiasUpdated Aug 28, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art style illustration showing an air compressor with gauges and safety icons on a teal background for FDNY A35 quiz

This FDNY A-35 practice test helps you check air compressor safety, controls, and procedures so you can spot weak areas before exam day. If you're also working on standpipes, try the FDNY s12 practice test. For fire guard basics, use the f-02 practice test to round out your prep with quick, clear feedback.

Which component is designed to open automatically to prevent a compressor receiver from exceeding its maximum allowable working pressure?
Pressure gauge
Drain cock
Relief valve (safety valve)
Check valve
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The primary purpose of an intake filter on an air compressor is to:
Reduce electrical load by 50%
Remove particulates before they enter the compressor
Add lubricant to the intake air
Increase discharge temperature
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Before servicing a belt-driven compressor, the correct safety control is to:
Shut off and lock out the power source, tag it, and verify zero energy
Turn off the room lights
Place a rag over the belt
Reduce pressure to 50 psi only
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Which instrument measures pressure relative to atmospheric pressure in psi on a compressor receiver?
Bourdon tube pressure gauge
Compound vacuum gauge
Rotameter
Thermocouple
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A desiccant air dryer primarily reduces:
Air dew point
Receiver volume
Motor starting current
Oil viscosity
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FDNY A35 requires that the air receiver tank data plate be legible. Which information must it show?
Compressor motor serial number only
Maximum allowable working pressure and manufacturer data
Building certificate of occupancy number
Date of last oil change only
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In a reciprocating air compressor, the inter-cooler between stages primarily:
Adds moisture to prevent corrosion
Removes heat to increase air density before the next stage
Increases air temperature to improve lubrication
Reduces receiver volume requirements to zero
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According to ANSI/ASME A13.1 pipe marking practices commonly used in the United States, which color identification is typically used for compressed air piping?
Yellow with black banding
Red with green diagonal stripes
Blue with white lettering
Solid brown
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The purpose of an unloader valve on a reciprocating compressor is to:
Measure dew point of compressed air
Lubricate piston rings
Increase receiver pressure setpoint by 25%
Prevent motor overload during startup by releasing head pressure
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For oil-lubricated compressors, the best practice for condensate management is to:
Store indefinitely in open containers
Discharge directly to a storm drain
Use an oil-water separator and dispose of waste oil properly
Evaporate in the compressor room using heaters
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Which condition most likely indicates a failed check valve between the compressor and receiver?
Intake filter becomes clean
Motor current is zero during operation
Receiver pressure drops backward through the compressor after shutdown
Oil temperature immediately falls to ambient after shutdown
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In NYC, an FDNY A35 certificate holder must ensure that the compressor room ventilation:
Uses recirculation only with no outside air
Is shared with a boiler flue draft fan
Is turned off during operation to conserve energy
Is sufficient to prevent accumulation of flammable vapors and dissipate heat
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Which hazard increases when flexible hoses are used in lieu of rigid piping for permanent compressor installations?
Lower pressure drop
Whip hazard and mechanical damage potential
Reduced noise levels
Improved fire resistance
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What is the recommended action if the receiver tank shows significant external corrosion or pitting?
Increase pressure to test strength during normal use
Strike with a hammer to test thickness
Apply paint and continue operation
Remove from service and have it inspected by a qualified person
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What is the most likely cause of frequent pressure switch short-cycling?
Receiver too small for demand and narrow differential setting
Ambient temperature within normal range
Intake filter too clean
Properly sized storage capacity
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It is acceptable to weld on a pressurized receiver tank if the weld area is small and controlled.
True
False
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When using nitrogen to pressure-test an air system, the area must be controlled and pressure increased gradually with a calibrated gauge.
True
False
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For a two-stage reciprocating compressor, the pressure ratio per stage is typically balanced to:
Increase pulsation
Maximize noise
Eliminate the need for cooling
Minimize total work and discharge temperature
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Which control strategy reduces rapid cycling in a fixed-speed compressor supplying variable demand?
Lower relief valve setpoint
Wider pressure differential and increased receiver storage
Narrow pressure differential and small receiver
Disable unloader
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In a heat-of-compression dryer, moisture removal relies on:
External refrigeration only
Using the hot compressed air directly for desiccant regeneration
Cooling tower water exclusively
Expanding air through an orifice
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Study Outcomes

  1. Understand Compressor System Components -

    Identify the key parts of an air compressor system - such as valves, regulators, and storage tanks - and describe their roles in maintaining proper operation.

  2. Calculate Pressure and Volume Relationships -

    Apply fundamental gas laws to perform accurate pressure and volume calculations relevant to FDNY A-35 practice test questions.

  3. Identify Common Safety Protocols -

    Recognize essential safety procedures for inspecting, operating, and shutting down air compressors to prevent accidents and ensure compliance.

  4. Apply Maintenance Best Practices -

    Demonstrate routine maintenance checks and troubleshooting steps to reduce the risk of system failures and extend equipment life.

  5. Analyze Fault Scenarios -

    Evaluate common compressor faults, diagnose underlying causes, and recommend corrective actions under high-pressure conditions.

  6. Evaluate Performance Metrics -

    Interpret performance data - including pressure readings and flow rates - to assess system efficiency and readiness for FDNY A35 practice test standards.

Cheat Sheet

  1. Compressor Pressure Ratings -

    Review the maximum working pressures stamped on air receiver tanks and ensure they align with the rated discharge pressure. According to NFPA 1001 guidelines, apply a safety factor of 1.5× to derive the test pressure. When tackling the fdny a35 practice test, remember that Test Pressure = Working Pressure × Safety Factor for a quick calculation.

  2. Key System Components -

    Identify each compressor component - receiver tank, aftercooler, air dryer, and separators - using the mnemonic RASP (Receiver, Aftercooler, Separator, Piping). Understanding flow paths helps you spot potential failure points and ensures efficient troubleshooting. This foundation is essential for acing any A-35 practice test question on system layout.

  3. Pressure-Volume Relationships (Boyle's Law) -

    Practice calculating pressure changes using P1 × V1 = P2 × V2, where P1 and V1 are initial conditions. For example, compressing 2 ft³ at 14.7 psi to 1 ft³ doubles the pressure to 29.4 psi. This formula is a staple on the a-35 practice test and builds core problem-solving skills.

  4. Safety Valves and Relief Devices -

    Know the difference between spring-loaded and pilot-operated relief valves, and remember that relief settings must never exceed the manufacturer's max working pressure. NFPA standards require testing relief devices annually to prevent over-pressurization incidents. A quick tip: "POP" valves open Promptly On Pressure to protect firefighters on the line.

  5. Routine Maintenance and Lubrication -

    Adopt a DAILY checklist: Drain condensate, Air filters, Inspect belts, Lubricate bearings, and Yearly overhauls. Use ISO VG 46 compressor oil and change it after every 500 operating hours to prevent wear. Solid maintenance routines boost confidence when you dive into the fdny a-35 practice test, especially for questions about downtime prevention.

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