Chapter 29

Question 1

Wear rings for a centrifugal pump can be installed on the:A. Stuffing box
B. Pump shaft
C. Pump casing or shaft or both
D. Impeller or casing or both

Answer 1

D

Question 2

Packing in the stuffing box of a centrifugal pump:A. Should not stop leakage entirely.
B. Consists of somatic and graphite components.
C. Requires no lubrication.
D. Should stop leakage entirely.

Answer 2

A

Question 3

A centrifugal pump that has high suction lifts and a resulting negative casing pressure will likely have:A. Wear rings installed.
B. A lantern ring or seal cage in the stuffing box.
C. No leakage from a lantern-equipped stuffing box.
D. No need for a shaft sleeve.

Answer 3

B

Question 4

Priming of a centrifugal pump means:A. Filling the casing with the liquid being pumped.
B. Evacuating the casing of air.
C. Filling the casing and suction line with the liquid being pumped.
D. Installing a foot valve on the pump discharge line.

Answer 4

C

Question 5

Wear rings are usually constructed of:A. Ceramics or aluminum.
B. Graphite or bronze.
C. Bronze or cast iron.
D. Steel or alloy steel.

Answer 5

C

Question 6

Flexible couplings will compensate for:A. overheating of packing.
B. axial shaft misalignment.
C. shaft eccentricity due to a badly bent shaft.
D. impeller imbalance.

Answer 6

B

Question 7

Most pump failure and/or damage occurs:A. After about 6 months of continuous service.
B. Due to vapor binding.
C. During initial startup.
D. Because of inadequate operator training.

Answer 7

C