Hydraulic and Pneumatic Power Flashcards
7 cards from real Airframe Mechanic Certification 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 and Pneumatic Power flashcards as text
What type of actuator converts hydraulic pressure into linear mechanical motion?
Answer: Linear actuator (hydraulic cylinder)
A linear actuator (hydraulic cylinder) uses fluid pressure acting on a piston to produce straight-line mechanical force and movement.
Which component prevents reverse flow in a hydraulic or pneumatic line?
Answer: Check valve
A check valve allows flow in only one direction and blocks reverse flow, protecting upstream components from back-pressure.
The purpose of a hydraulic snubber on a pressure gauge is to:
Answer: Dampen pressure surges to protect the gauge and provide steady readings
A snubber is a restrictor that dampens rapid pressure fluctuations, protecting the gauge mechanism from damage and providing a stable, readable indication.
When MIL-PRF-5606 (red) and MIL-PRF-83282 (red) hydraulic fluids are inadvertently mixed, the result is:
Answer: Generally acceptable because both are petroleum-based and compatible
MIL-PRF-5606 and MIL-PRF-83282 are both petroleum-based mineral oils and are considered compatible with each other and the same seal materials.
A double-acting hydraulic actuator differs from a single-acting actuator in that it:
Answer: Can apply hydraulic pressure to extend AND retract the piston
A double-acting actuator has ports on both sides of the piston, allowing hydraulic pressure to power both extension and retraction strokes.
Hydraulic system contamination is MOST commonly introduced during:
Answer: Maintenance when lines are opened and fluid is serviced
Most contamination enters hydraulic systems during maintenance activities when lines are disconnected, components are replaced, or fluid is added.
What is the primary advantage of a variable-displacement hydraulic pump over a fixed-displacement pump?
Answer: Automatically adjusts output flow to match system demand, reducing heat generation
A variable-displacement pump reduces its output as system demand drops, minimizing heat buildup and energy waste compared to a fixed-displacement pump that must bypass excess flow through a relief valve.