Practice Test Geeks(ITMC) Industrial Technology Maintenance Certification Practice Test
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Hydraulic 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.

Read the first 7 Hydraulic Systems flashcards as text

  1. What is the correct procedure when replacing a hydraulic hose assembly?

    Answer: Depressurize the system, tag out, replace with same spec hose, and check for leaks at operating pressure

    Safe hose replacement requires full system de-energization and exact specification replacement to maintain system integrity.

  2. In a hydrostatic transmission, the pump and motor are both variable displacement. What advantage does this provide?

    Answer: Infinite speed ratio adjustment and regenerative braking capability

    Variable displacement on both sides allows smooth, stepless speed control and enables the motor to act as a pump for braking.

  3. A hydraulic system experiences pressure spikes that damage components. What device best protects against this?

    Answer: Nitrogen-charged bladder accumulator

    A bladder accumulator absorbs pressure spikes by compressing the pre-charged nitrogen gas when fluid pressure surges.

  4. What is the recommended method for detecting hydraulic system leaks in tight or hidden areas?

    Answer: UV fluorescent dye added to the fluid, inspected with a UV light

    UV dye is injected into the system, and a UV lamp reveals even pinhole leaks that are otherwise invisible.

  5. Which condition causes thermal runaway in a hydraulic system?

    Answer: Heat generated by inefficiencies exceeds the system's cooling capacity, continuously raising fluid temperature

    When system inefficiencies (leakage, relief valve bypassing) generate more heat than the cooler can remove, temperatures rise uncontrollably.

  6. What is the primary difference between a hydraulic servo valve and a proportional valve?

    Answer: Servo valves use closed-loop feedback for higher precision; proportional valves typically use open-loop control

    Servo valves incorporate position feedback (LVDT) and achieve much tighter control accuracy than open-loop proportional valves.

  7. When pre-charging a bladder accumulator with nitrogen, the pre-charge pressure should typically be set to:

    Answer: 60–90% of minimum system working pressure

    Pre-charge at 60–90% of minimum working pressure ensures the bladder does not fully collapse or over-extend during operation.