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Book 2 Ch 8 - Plant Maintenance Practice Quiz

front 1

What is the name of the housing of a centrifugal pump that directs the flow of water to the pump discharge?

back 1

Volute

front 2

Corrective and preventive are two types of maintenance. What is the third type?

back 2

Predictive

front 3

What is the name of the valve placed on the bottom of the suction pipe of a groundwater well pump?

back 3

Foot valve

front 4

These types of valves are used in pump suctions and are often the vertical lift disc design.

back 4

•Foot valves

•Butterfly valves

•1/4 turn plug valves

•Gate valves

front 5

Which valve listed below is primarily used as a flow control valve?

back 5

Butterfly valve

front 6

Rope type packing glands in centrifugal pump stuffing boxes should leak
how much?

back 6

One drip per second

front 7

A piece of equipment has failed at a water plant and must be repaired. What should the maintenance person do first?

back 7

Read the O&M manual

front 8

When this phenomena occurs, it sometimes is accompanied by loud noises that sound like someone is pounding on the impeller with a hammer, or the
pump is full of rocks.

back 8

Cavitation

front 9

When a piece of equipment is locked out and tagged out (LO/TO), how many people hold a key to the lock used for LO/TO?

back 9

One, the person who locked it out

front 10

What is a rule of thumb regarding the installation of rope packing into a centrifugal pump packing gland?

back 10

Never install new rings of packing on top of old packing

front 11

What type of power is usually supplied at 120 volts, has three wires or leads, two of the leads carry 120 volts each, and the remaining lead is a neutral?

back 11

Single phase power

front 12

Voltage unbalance between the three legs of power to a motor should not exceed what percent?

back 12

5%

front 13

At least 75% of centrifugal pump problems can be traced to what?

back 13

The suction side of the pump

front 14

OSHA standards require that all equipment that could unexpectedly start up or release stored energy must be what?

back 14

Locked out and tagged whenever it is worked on

front 15

Mechanical seals installed on centrifugal pump shafts should leak how much?

back 15

Mechanical seals should NOT leak

front 16

Stored energy in gas, air, water, steam and hydraulic systems must be what?

back 16

Bled of any stored energy