433A Pneumatic Systems 2

Question 1

What does a 5/2 directional control valve designation mean?

Accepted Answer

A valve with 5 ports and 2 switching positions

Answer

5 valves in a bank of 2

Answer

5 PSI pressure with 2 GPM flow

Answer

A valve for 5-inch cylinders with 2-inch rods

Question 2

What is the function of a pneumatic speed control valve (flow control)?

Accepted Answer

To regulate the speed of a pneumatic actuator by restricting airflow, typically on the exhaust side

Answer

To increase the air pressure at the cylinder

Answer

To increase the volume of air in the system

Answer

To filter contaminants from the air

Question 3

What causes a pneumatic cylinder to drift or creep slowly under load?

Accepted Answer

Air leakage past worn piston seals or through a leaking valve

Answer

Too much lubricator oil

Answer

The air pressure is too high

Answer

The cylinder bore is too large

Question 4

What is the purpose of a muffler (silencer) on a pneumatic exhaust port?

Accepted Answer

To reduce the noise of exhausting compressed air while allowing free airflow

Answer

To increase exhaust flow speed

Answer

To filter contaminants from incoming air

Answer

To create back-pressure for slower cylinder movement

Question 5

What is an air-over-oil system?

Accepted Answer

A system that uses compressed air to pressurize a closed oil circuit, providing smooth hydraulic-like cylinder control with pneumatic power

Answer

A system that uses oil-free air

Answer

A system for drying compressed air

Answer

A cooling system for the compressor

Question 6

Why is it important to drain the moisture trap regularly on a compressed air system?

Accepted Answer

Because accumulated water can be carried into downstream equipment, causing corrosion, ice blockages, and component damage

Answer

To reduce the weight of the system

Answer

To increase the pressure in the tank

Answer

Moisture traps never need draining