CPT CPT Fluid Systems & Hydraulics

Question 1

What is the primary function of a check valve in a hydraulic system?

Accepted Answer

Allow flow in one direction only

Answer

A check valve permits fluid flow in only one direction, preventing backflow that could damage pumps or cause system malfunction.

Question 2

Which unit is used to express hydraulic pressure in industrial process systems in the US?

Accepted Answer

PSI

Answer

PSI (pounds per square inch) is the standard US unit for measuring hydraulic pressure in industrial systems.

Question 3

What does cavitation in a hydraulic pump indicate?

Accepted Answer

Insufficient fluid supply or trapped air causing vapor bubbles

Answer

Cavitation occurs when the pump inlet is starved of fluid or contains air, forming vapor bubbles that collapse violently and damage pump components.

Question 4

A relief valve in a hydraulic circuit is set to open at 2,000 PSI. What happens when system pressure reaches 2,500 PSI?

Accepted Answer

The relief valve opens and diverts fluid back to the reservoir

Answer

When pressure exceeds the relief valve setpoint, the valve opens and bypasses fluid to the reservoir, protecting the circuit from overpressure damage.

Question 5

Which type of hydraulic pump delivers a fixed volume of fluid per revolution regardless of outlet pressure?

Accepted Answer

Fixed displacement pump

Answer

A fixed displacement pump outputs a constant volume per revolution; output flow changes only with shaft speed, not system pressure.

(CPT) Certified Process Technician Practice Test

(CPT) Certified Process Technician Practice Test

CPT CPT Fluid Systems & Hydraulics