Chapter 75 Pump Operation and Maintenance UPDATED ACTUAL Exam Questions and CORRECT Answers

Chapter 75 Pump Operation and
Maintenance UPDATED ACTUAL Exam
Questions and CORRECT Answers
A slight leakage is desired between the pump shaft and packing of the majority of pumps in order
to:
a. Prevent the ingress of air
b. Increase pump capacity and efficiency
c. Prevent wearing of the wear rings
d. Lubricate the surfaces

e. Prevent the pump from vapor locking. - CORRECT ANSWER - d. Lubricate the surfaces


Wear rings:
1. Are used on impellers
2. Are used on the casing
3. Give protection to the shaft
4. Reduce the maintenance costs of the pump


a. 1, 2, 3
b. 1, 2, 4
c. 2, 3, 4
d. 1, 3

e. 1, 2. - CORRECT ANSWER - b. 1, 2, 4


When lubricating equipment the operator should also check for:
1. Unusual machine noises
2. Unusual consumption of lubricant
3. Excessive heat in the bearing housing

, 4. Excessive leakage of lubrication
a. 1, 2, 3
b. 1, 2, 4
c. 2, 3, 4
d. 1, 3, 4

e. 1, 2, 3, 4. - CORRECT ANSWER - e. 1, 2, 3, 4.


Shaft misalignment during operation of a pump can be caused by bearing wear, thermal
expansion and:
a. Shaft flexing
b. Throttling of the discharge valve
c. Overloading the pump
d. Loss of lubrication

e. Improper installation. - CORRECT ANSWER - a. Shaft flexing


When a pump is operating, your inspection should include the following:
a. You must check the impeller
b. You must be sure that the suction valve is closed
c. You should check the discharge pressure
d. You must be sure that the drain valve is open

e. You should check the oil pressure. - CORRECT ANSWER - c. You should check the
discharge pressure


Lantern rings:
1. Prevent liquid leakage from the pump
2. Are fed by a liquid
3. Provide a seal to prevent air from entering the pump
4. Are mostly used on high lift pumps
a. 1, 2, 3