CPT Instrumentation & Equipment Maintenance 3

Question 1

A centrifugal pump experiences cavitation. Which corrective action is most appropriate?

Accepted Answer

Reduce suction head or increase NPSH available

Answer

Cavitation occurs when NPSH available falls below NPSH required, so increasing suction pressure or reducing inlet losses eliminates vapor bubble formation.

Question 2

What instrument is used to verify that a rotating shaft is operating within acceptable vibration limits?

Accepted Answer

Accelerometer or vibration sensor

Answer

An accelerometer or vibration sensor measures mechanical vibration amplitude and frequency to detect imbalance, misalignment, or bearing wear in rotating equipment.

Question 3

Which type of heat exchanger maintenance is performed to remove scale and fouling deposits from tube surfaces?

Accepted Answer

Chemical or mechanical cleaning

Answer

Chemical cleaning (acid or solvent) or mechanical cleaning (rodding or high-pressure water jetting) removes fouling deposits that reduce heat transfer efficiency.

Question 4

What does the abbreviation 'P&ID' stand for in process plant documentation?

Accepted Answer

Piping and Instrumentation Diagram

Answer

P&ID stands for Piping and Instrumentation Diagram, which shows the interconnection of process equipment, piping, and instrumentation.

Question 5

A safety relief valve (SRV) is leaking continuously at normal operating pressure. What is the most likely cause?

Accepted Answer

Operating pressure too close to set pressure

Answer

When operating pressure is within 10% of the set pressure, the valve disk may 'simmer' or leak due to insufficient margin between operating and set pressure.

(CPT) Certified Process Technician Practice Test

(CPT) Certified Process Technician Practice Test

CPT Instrumentation & Equipment Maintenance 3