You discover that your feed water pump is not delivering sufficient water. A possible cause is

You discover that your feed water pump is not delivering sufficient water. A possible cause is

a) the impeller is plugged
b) the suction lift is too low
c) the discharge head is not high enough
d) there is too much water in the pump
e) the foot valve is fully open







Answer: A

If a pump is running and has no discharge pressure, what will you do?

If a pump is running and has no discharge pressure, what will you do?

a) close the suction valve a little
b) open the lubrication valve
c) check the lubricant level
d) check to see if the suction valve is open
e) close the discharge valve




Answer: D

If pump speed is too high

If pump speed is too high

a) the driver may be overloaded
b) discharge pressure will be below normal
c) no liquid will be delivered
d) the pump will lose its prime after starting
e) there will be air or gas in the liquid





Answer: A

A plugged impeller symptom or result will be

A plugged impeller symptom or result will be

a) air leaks in suction line and stuffing boxes
b) wrong direction of rotation
c) loss of prime
d) an overheated stuffing box
e) no liquid being delivered




Answer: E

If the packing gland of a centrifugal water pump is leaking too much, you should

If the packing gland of a centrifugal water pump is leaking too much, you should

a) tighten up the gland until all leakage has been stopped
b) tighten up the gland but permit a slight amount of leakage
c) tighten up the gland as far as is possible
d) throttle the suction valve a little
e) tighten up the gland until there is 10% leakage





Answer: B

Shaft misalignment during operation of a pump can be caused by bearing wear, thermal expansion, and

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 lubricant
e) improper installation





Answer: A