CPE Mechanical Systems & Equipment 3

Question 1

Which bearing type is most appropriate for applications with combined radial and axial (thrust) loads?

Accepted Answer

Angular contact ball bearing

Answer

Angular contact ball bearings are designed with a contact angle that allows them to carry significant combined radial and axial loads simultaneously.

Question 2

A pneumatic system uses a filter-regulator-lubricator (FRL) unit. What is the function of the regulator?

Accepted Answer

Maintain consistent downstream air pressure

Answer

The regulator reduces and stabilizes compressed air pressure to the set downstream value regardless of upstream pressure fluctuations.

Question 3

When aligning a flexible shaft coupling, which type of misalignment involves the shaft centerlines being parallel but offset?

Accepted Answer

Parallel (offset) misalignment

Answer

Parallel misalignment occurs when two shaft centerlines are parallel but displaced laterally from each other.

Question 4

The Affinity Laws state that when pump speed doubles, the pump head changes by a factor of:

Accepted Answer

4 (quadruples)

Answer

Per the Affinity Laws, pump head varies as the square of the speed ratio, so doubling speed quadruples the head.

Question 5

A compressed air receiver tank serves which primary function in a plant air system?

Accepted Answer

Stores air to buffer demand peaks and reduce compressor cycling

Answer

The receiver tank acts as an air reservoir, smoothing out fluctuating demand and reducing compressor start-stop cycling.

(CPE) Certified Plant Engineer Practice Test