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Class 2 > Maintenance Class > Flashcards

Maintenance Class Flashcards

1
Q

The two types of misalignment when connecting a pump and motor are angular and?

A

Eccentric

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2
Q

If a pump is considered to be centrifugal, which of the following would result in an increase in power consumption?

A

Mineral Concentration

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3
Q

Which of the following federal organizations is responsible for administering personal equipment guidelines?

A

OSHA

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4
Q

Excess grease applied to bearings will give what warning before catastrophic failure?

A

Audible warning

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5
Q

Keeping proper records of historical maintenance will be most useful when?

A

An unexpected but previously documented system failure occurs.

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6
Q

The best reason for replacing a shear pin with a stronger pin with a stronger metal is what?

A

Only the original design shear pin should ever be placed back into service

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7
Q

Which of the following valves is least appropriate for throttling purposes?

A

Gate Valve

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8
Q

A worn pump impeller would most likely be the result of attempting to pump liquids high in which of the following?

A

Grit

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9
Q

Closing the discharge valve on a positive displacement pump will result in which of the following?

A

Failure of the pump and components

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10
Q

Any piece of equipment, specifically pumps, that are not used should have a routine run schedule performed. Which of the reasons is the best answer?

A

These pumps will need to be able to perform at 100% capacity

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11
Q

A confined space that is known to contain a hazardous atmosphere will be made safe to enter by performing which of the following?

A

Ventilating the space until safe atmosphere is achieved

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12
Q

The flash point of any flammable vapor refers to what?

A

The exact moment when explosive combinations of oxygen and vapor are achieved

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13
Q

A safety data sheet is best suited for which of the following?

A

Establishing where and how all reagents and chemicals present should be stored.

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14
Q

What could cause a misalignment of internal components of a secondary clarifier?

A

Wear on the side of the chain and sprockets

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15
Q

What is another name for a rotary valve or a quarter turn valve?

A

Ball

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16
Q

Maintenance of any equipment that is new and under warranty should always be based on?

A

O&M

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17
Q

A trench that is 40 feet deep and 12 feet wide can be best described as?

A

Confined Space

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18
Q

Magnesium and Zinc plates are located under the water level in a tank are most likely there for what?

A

Sacrificial cathode

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19
Q

Which of the following mill most effectively reduce the amounts of emergency repairs?

A

Preventative and Predictive Maintenance

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20
Q

Vacuum breakers, air gaps, and PVB are all items for what?

A

Prevent Cross-Connection

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21
Q

Which type of fire extinguishers should be used for an electrical fire?

A

Class C

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22
Q

Painting metal surfaces has sole purpose of what/

A

Corrosion

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23
Q

What is the main reason for evacuating all the air in a volute casing?

A

Cavitation chances drop dramatically

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24
Q

If a pump is considered dynamic which of the following can it not be?

A

Progressive Cavity

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25
Q

The term torque is best described as?

A

The energy required to begin to move a rotatable object

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26
Q

If a mechanical seal is leaking what should you do?

A

The seal needs to be safely replaced

27
Q

Materials such as concrete are most susceptible under what condition?

A

Highly Acidic waters

28
Q

Why should you run any equipment for as long as you possibly can before turning them off?

A

Longer runtimes decrease undue stress during startup.

29
Q

Unguarded drive couplings are best referred to as?

A

hazard

30
Q

Adding what liquid to soap results in grease?

A

Oil

31
Q

Which of the following is not a type of impeller

A

Partially closed

32
Q

Which of the following would be considered as corrective maintenance

A

Replacing a cracked drive shaft

33
Q

Closing the suction side valve on a centrifugal pump will eventually result in?

A

Cavitation of the impeller.

34
Q

What is the sacrificial part located on the drive shaft?

A

Sleeve

35
Q

Having the original maintenance manuals from the manufacturer will help with what?

A

Troubleshooting

36
Q

Centrifugal pumps operate on 2 theories

A

Energy transfer and centrifugal force

37
Q

The impellers function in a pump is

A

Transfer of Energy

38
Q

Energy within a pump is transferred from velocity head to pressure head by?

A

Shape of volute case

39
Q

An inside mechanical seal would be

A

A seal with scaling faces inside the stuffing box

40
Q

A suction side of a pump should have what type of reducer?

A

Eccentric

41
Q

Cavitation can be cause by what

A

Over Pumping

42
Q

What would require external seal water?

A

Muddy or gritty water being pumped or Suction lift exceeds 15 feet

43
Q

The two classes of mechanical couplings are?

A

Rigid and Flexible

44
Q

Can a bearing be over lubricated?

A

Yes

45
Q

For a line shaft turbine the entire bowl assembly should or shouldn’t be underwater?

A

Should be

46
Q

Excessive upthrust in a line shaft turbine is caused by?

A

Low water levels

47
Q

How do you determine suitable oil viscosity?

A

Operating speed
Operating Temperature
Load Carried

48
Q

For each 20 degrees F rise in temp, an oils life is reduced by how much?

A

50 percent

49
Q

How are torque wrenches stated?

A

Inch pounds for small fittings
Foot pounds for larger fittings

50
Q

Should u use a wrench as a hammer?

A

No

51
Q

What did Bernoulli say?

A

As the velocity of fluid flow increases the pressure exerted by the fluid decreases.

52
Q

What are the 4 types of lubricants?

A

Liquid-Oils
Semi Solid-Grease
Solid-Metal
Gas-When separation is needed

53
Q

Viscosity is what?

A

Thickness of oil

54
Q

What is the most common soap base for grease?

A

Lithium

55
Q

3 lube selection criteria

A

Flash Point- Temp at which vapor will burst into flame
Fire Point- Temp at which lubrication will burn
Pour Point- Temp below which oil will not pour

56
Q

What is a pump?

A

Mechanical device used to force water or other liquids to move

57
Q

What is a Drive?

A

A source of power designed to supply force and motion to drive machinery

58
Q

Dynamic Pump

A

Energy is added continuously

59
Q

Displacement Pumps

A

Energy is added to a set volume

60
Q

How long is the break in period when replacing packing?

A

24hrs

61
Q

What is the purpose of packing?

A

Controls leakage along the shaft and prevents air from seeping into volute case.

62
Q

What is a bearing?

A

Anti friction device

63
Q
A

Class 2 (2 decks)

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