Practice Test Geeks(ITMC) Industrial Technology Maintenance Certification Practice Test
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Pneumatic Systems Flashcards

7 cards from real ITMC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is 'pressure dew point' in compressed air terminology?

    Answer: The temperature at which moisture condenses in air at system pressure

    Pressure dew point is the temperature at which water vapor in pressurized air will begin to condense into liquid.

  2. Which condition causes a pneumatic cylinder to 'drift' or creep when its control valve is in the center/blocked position?

    Answer: Worn or damaged piston seals allowing internal bypass

    Worn piston seals allow compressed air to bypass from the high-pressure side to the low-pressure side, causing the rod to move unintentionally.

  3. What is the function of a quick-exhaust valve in a pneumatic circuit?

    Answer: To vent exhaust air locally at the cylinder for faster retraction speed

    A quick-exhaust valve exhausts cylinder air directly to atmosphere at the actuator rather than routing it back through the control valve, greatly increasing speed.

  4. A pressure relief valve on a compressor is set to 125 PSI. The compressor cut-out switch is set to 120 PSI. Why is the relief valve set higher?

    Answer: The relief valve is a safety backup if the pressure switch fails to stop the compressor

    The relief valve acts as a safety device — it only opens if the cut-out switch fails and pressure exceeds safe limits, preventing catastrophic over-pressurization.

  5. Which type of air dryer achieves the lowest pressure dew point for instrument air applications?

    Answer: Desiccant (regenerative) dryer

    Desiccant dryers using regenerative media can achieve pressure dew points as low as -40°F or lower, far exceeding the capability of refrigerated dryers.

  6. What does 'SCFM' measure in pneumatic system specifications?

    Answer: Standard Cubic Feet per Minute — volumetric air flow at standard conditions

    SCFM (Standard Cubic Feet per Minute) measures air flow volume referenced to standard conditions of 68°F, 14.7 PSIA, and 0% relative humidity.

  7. When replacing a pneumatic cylinder seal kit, the technician should always:

    Answer: Clean all metal surfaces and lightly lubricate new seals before assembly

    Cleaning mating surfaces and applying appropriate lubricant to new seals prevents damage during installation and ensures proper sealing from first use.