Mechanical Aptitude Hydraulics and Pneumatics Questions and Answers 3

Question 1

What happens to the speed of a hydraulic cylinder if the pump flow rate is increased?

Accepted Answer

Speed increases

Answer

Speed decreases

Answer

Speed stays the same

Answer

The cylinder stops

Question 2

In a pneumatic system, what does a pressure regulator do?

Accepted Answer

Maintains a constant downstream pressure

Answer

Increases system pressure beyond supply pressure

Answer

Filters contaminants from the air

Answer

Stores compressed air

Question 3

What is cavitation in a hydraulic pump, and why is it harmful?

Accepted Answer

Formation and collapse of vapor bubbles that erode metal surfaces

Answer

Excessive pressure that bursts seals

Answer

Overheating of hydraulic fluid

Answer

Blockage of fluid passages by debris

Question 4

What is the purpose of a directional control valve in a hydraulic circuit?

Accepted Answer

To control the direction of fluid flow to actuators

Answer

To regulate flow speed

Answer

To filter hydraulic fluid

Answer

To limit maximum system pressure

Question 5

Why is mineral oil the most common hydraulic fluid rather than water?

Accepted Answer

Oil provides better lubrication and corrosion protection

Answer

Water is too expensive

Answer

Water is too heavy

Answer

Oil is easier to compress

Question 6

What does the term 'double-acting cylinder' mean?

Accepted Answer

A cylinder that uses fluid pressure for both extension and retraction

Answer

A cylinder with two pistons

Answer

A cylinder that operates at double speed

Answer

A cylinder with double the normal bore size