Mechanical Aptitude Hydraulics and Pneumatics Flashcards
7 cards from real MECHANICAL APTITUDE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Mechanical Aptitude Hydraulics and Pneumatics flashcards as text
Which component prevents reverse flow of fluid in a hydraulic or pneumatic circuit?
Answer: Check valve
A check valve allows fluid to flow in only one direction and automatically blocks reverse flow.
A hydraulic system is overheating. Which of the following is the LEAST likely cause?
Answer: Using the correct recommended fluid type
Using the correct recommended fluid is proper maintenance and would not cause overheating; the other options all generate excess heat.
In a pneumatic FRL unit, what is the correct order of components from the air supply inlet?
Answer: Filter → Regulator → Lubricator
Air must be filtered first to remove contaminants, then regulated to working pressure, then lubricated before reaching pneumatic tools.
What does 'hydraulic lock' refer to in a cylinder circuit?
Answer: Fluid is trapped with no path to move, preventing cylinder motion
Hydraulic lock occurs when fluid is trapped in a cylinder with no return path, making movement impossible since liquids are incompressible.
A pneumatic cylinder is slow to extend but returns at normal speed. The most likely cause is:
Answer: Restriction or flow control limiting flow to the extend port
A flow restriction on the extend port slows extension only, while the return port is unrestricted, explaining the difference in speed.
Which type of hydraulic motor converts fluid flow into rotary motion?
Answer: Hydraulic motor
A hydraulic motor is the rotary counterpart to a hydraulic pump, converting pressurized fluid flow into rotational torque and speed.
What is the primary reason hydraulic systems use mineral-based or synthetic oil rather than water?
Answer: Oil provides lubrication, corrosion protection, and higher boiling point
Hydraulic oil lubricates internal components, prevents corrosion, has a high boiling point, and maintains viscosity across a wide temperature range — properties water lacks.