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1. UT Basic/ Advanced > UTB7 Prime Movers Pumps and Compressors > Flashcards

UTB7 Prime Movers Pumps and Compressors Flashcards

1
Q

Water is circulated from the oceans to the atmosphere by a series of processes and then to the surface of the earth and beneath it. This is known as what cycle? (Page 7-1)

A

Hydrologic

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2
Q

What is water that is flowing in our streams or rivers, resting in our lakes and ponds, or flowing into the sea? (Page 7-2)

A

Surface water

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3
Q

What is that part of the water or moisture that has precipitated from the atmosphere upon the surface of the earth and has been absorbed by the soil and collected below a certain level called the “water line.”? (Page 7-2)

A

Groundwater

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4
Q

What are organic or inorganic materials or chemicals that cause an unpleasant taste, color, or odor in the water? (Page 7-4)

A

Dissolved Impurities

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5
Q

What include organisms as well as organic and inorganic materials that usually make the water turbid or muddy looking? (Page 7-4)

A

Suspended Impurities

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6
Q

Disease-producing organisms carried by water occur in how many classes? (Page 7-4)

A

Two

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7
Q

Symptoms of what disease include rose-colored eruptions of the skin, accompanied by a high fever (lasting about 4 weeks) and frequent bowel movements? (Page 7-4)

A

Typhoid Fever

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8
Q

What is the skeletal remains of tiny algae, called diatoms, found in marine deposits that have been lifted above sea level? (Page 7-6)

A

Diatomaceous silica

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9
Q

What is the water disinfectant specified for Navy use? (Page 7-6)

A

Chlorine

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10
Q

If excess lime is used for softening water, it makes the water alkaline and disinfects after about how many hours of contact? (Page 7-6)

A

10

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11
Q

Each pound of liquid chlorine produces about how many cubic feet of chlorine gas at atmospheric pressure and at a temperature of 68°F? (Page 7-6)

A

5

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12
Q

The time elapsing between the introduction of chlorine and use of the water is how long and is termed the contact period? (Page 7-7)

A

30 minutes

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13
Q

What value is a measure of the acidic or alkaline nature of the water? (Page 7-7)

A

pH

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14
Q

pH value ranges from 0 to what? (Page 7-7)

A

14

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15
Q

Never apply a flame, blowtorch, or other direct heat to chlorine containers; discharge them in a room with a temperature of about what? (Page 7-8)

A

70°F

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16
Q

Direct-feed chlorinators are used chiefly as emergency equipment and on small installations where it is not possible to obtain a water supply suitable for operating a solution-feed machine. They cannot be used where the pressure of the water being treated is more than what psi and are limited in the types of semiautomatic and automatic controls that may be used? (Page 7-9)

A

20

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17
Q

Chlorine expands into a gas at a ratio of what? (Page 7-9)

A

1:460

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18
Q

For variable vacuum operation, the injector vacuum must be at least how many inches of mercury? (Page 7-10)

A

10

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19
Q

What are solution chemical feeders that introduce chlorine into the water supply as hypochlorite solution? (Page 7-11)

A

Hypochlorinators

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20
Q

To prevent accidents caused by the corrosive action of hypochlorite solutions, use what or steel tanks lined with rubber or chlorine-resistant plastic as solution containers? (Page 7-15)

A

Vitreous crocks

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21
Q

Test for leaks in ammonia gas piping with a bottle of diluted what? (Page 7-17)

A

Muriatic acid

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22
Q

Ammonia solution or aqua ammonia can be stored indefinitely, but ammonia gas is created at about what temperature if the container is open? (Page 7-17)

A

80°F

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23
Q

When collecting samples for chemical analysis, you will find what amount of water usually enough to determine the mineral content? (Page 7-17)

A

1 gallon

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24
Q

What test permits the measurement of relative amounts of total residual chlorine, free available chlorine, and combined available chlorine? (Page 7-20)

A

Orthotolidine-arsenite (OTA)

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25
Q

What test measures the strength of acid or alkali in water? (Page 7-21)

A

pH

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26
Q

A pH reading of 7 is neutral (in a technical sense), values below 7 are acidic, and those above 7 are what? (Page 7-21)

A

Alkaline

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27
Q

What term refers to the acid-neutralizing capacity of the water? (Page 7-22)

A

Alkalinity

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28
Q

What is a reliable method for determining the proper chemical dosages and conditions for coagulation of water to remove color and turbidity? (Page 7-26)

A

Jar test

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29
Q

Which common type of drive is used with electric motors?

A

Flexible coupling

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30
Q

Lubricating oils can be furnished by any of the major oil companies, and it is the responsibility of the oil vendor to supply suitable lubricants. Which of the following temperatures is the minimum amount allowed for lubricating oil?

A

390°F

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31
Q

Which desiccant compound is utilized in the air dryer?

A

Silica gel

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32
Q

The mechanism or linkage that transmits the mechanical power developed by the prime mover is also known as what?

A

Drive

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33
Q

Of the different types of AC motors available, which one will you primarily utilize?

A

Rotating-field induction

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34
Q

What electrical principle is used to produce the mechanical rotation of a rotor?

A

Electromagnetic induction

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35
Q

The rotational speed of the stator field will remain constant unless which of the following occurs?

A

Frequency of electric power source varies.

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36
Q

Split phase induction motors are designed to operate on how many phase currents?

A

One

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37
Q

What is the primary purpose of the capacitor-start induction motor?

A

To store electricity for more power during startup.

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38
Q 
Which of the following bearings is NOT used with electric motors?
A. Sleeve
B. Roller
C. Ring
D. Ball
A

Ring

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39
Q

What is the result of any misalignment in excess of tolerances in the flexible coupling?

A

Rapid wear of bushing pins

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40
Q

What does a lack of springiness in a belt drive indicate?

A

Too little tension

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41
Q

What does excessive belt rubbing on the sheaves indicate?

A

Belt slippage

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42
Q

When replacing a drive belt on a multi-belt drive system, what must occur during replacement procedures?

A

All belts require replacement

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43
Q

When conducting cleaning procedures on a stator, which device should be used to remove dirt accumulations?

A

Vacuum

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44
Q

Diesel engines convert what type of energy into mechanical energy?

A

Heat

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45
Q

What could result from sudden cooling of a diesel engine?

A

Crack cylinder heads

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46
Q

What causes the formation of heavy carbon deposits in the piston rings?

A

Diesel engine at a slow idle for any appreciable length of time.

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47
Q

A diesel engine should be stopped if the lube oil pressure does NOT indicate positive pressure after what time frame?

A

30 seconds

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48
Q

Once the diesel engine is secured, how long should cooling water remain circulating?

A

15 to 30 minutes

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49
Q

Most gasoline engines operate on a ____ stroke cycle

A

4

50
Q

When is the fuel mixed with air in a gasoline engine?

A

Before being admitted to the cylinder

51
Q

How does the diesel engine produce combustion?

A

Heat of compression

52
Q

(True or False) Pumps are used to move only water that flows or can be made to flow.

A

True

53
Q

How many types of head are there in pump operation?

A

4

54
Q

Which type of head is defined as the total pressure of the liquid entering the pump?

A

Suction head

55
Q

Which type of head is defined as the pressure of liquid leaving the pump?

A

Discharge head

56
Q

Which type of head is defined as the net difference between the suction head and the discharge head?

A

Total discharge head

57
Q

Suction head is expressed in what form when a negative condition exists?

A

Inches of mercury

58
Q

When the pump becomes vapor bound and the suction lift pressure reduces, what is this condition known as?

A

Cavitation

59
Q

What type of valve is used to permit liquid flow in only one direction?

A

Check valve

60
Q

How are pump types classified?

A

By the type of movement causing their pumping action

61
Q

What is another term used for rotary pumps?

A

Positive displacement

62
Q

Which application is associated with rotary pumps?

A

Transport of JP-5 fuel

63
Q

Rotary pumps are classified by the type of _____.

A

Rotating element employed

64
Q

Which pump moves water by means of a piston that moves back and forth inside a cylinder?

A

Reciprocating

65
Q 
Which of these elements is NOT used to designate the size of a reciprocating pump?
A. Vertical stroke pressure
B. Diameter of steam piston
C. Diameter of pump plunger
D. Length of stroke
A

Vertical stroke pressure

66
Q

Which type of reciprocating pump is most often used by the Seabees?

A

Direct acting

67
Q

Which pump is used to pump water from a ditch or sump?

A

Diaphragm

68
Q

Which type of diaphragm pump can handle liquids that contain sand or mud?

A

Mud hog

69
Q

What is another term for a reciprocating pump which has only one liquid cylinder?

A

Simplex

70
Q

(True or False) As the velocity of a fluid increases, the pressure or pressure head of that fluid decreases.

A

True

71
Q

Large multi-stage, high capacity centrifugal pumps are in what position?

A

Horizontal

72
Q

Most centrifugal pumps utilized by the Seabees have what type of impellers?

A

Closed

73
Q

What piece of equipment is NOT used in centrifugal pumps used for pumping sewage?

A

Diffuser vanes

74
Q

Which type of centrifugal pump is used to pump wells?

A

turbine well pumps

75
Q

Centrifugal pumps are used in wells not exceeding which depth in feet?

A

22

76
Q

(True or False) If steam is used to support the fire protection system, the pump must have a constant minimum pressure of 60 pounds of steam.

A

False

50 pounds of steam

77
Q

The violent collapse of vapor bubbles in the pump causes what condition?

A

Vibration

78
Q

Which valve needs to be closed prior to starting a centrifugal pump?

A

Discharge stop valve

79
Q 
Which of the following forms is NOT taken by pump packing?
A. Disk
B. Coils
C. Rings
D. Spirals
A

A. Disk

80
Q

What type of material is used for the seal faces in water service pumps?

A

Carbon

81
Q

Mechanical seals should be replaced when the leakage rate exceeds what amount?

A

5 drops per minute

82
Q

What is used to level pumping units?

A

Jacking screws

83
Q

On low pressure pumps, the wearing ring diametrical clearance is what value in inches?

A

0.015 - 0.030

84
Q

What type of pump is exclusively used in well pumping?

A

Air-lift pumps

85
Q

What substance does an air lift pump use to move or lift a liquid?

A

Compressed air

86
Q

The capacity of the air lift pump depends largely on what factor?

A

Percentage of submergence of the foot piece

87
Q

What effect does the increase of the discharge line have on the velocity of the discharge?

A

Decreases

88
Q

How long, in inches, are the bolts utilized in pump foundation setup?

A

3/4 - 1

89
Q

What type of level is used in setting up the pump?

A

Spirit level

90
Q

Angular alignment of pump setup is taken between which two pieces of equipment?

A

Pump shaft and drive shaft

91
Q

What is the recommended number of hours to wait for grout to harden before tighten foundation bolts?

A

48

92
Q

What type of bolt is used with expansion joints associated with pump piping?

A

Tie bolts

93
Q

What needs to be installed if the pump is operating under static suction lift conditions?

A

Foot valve

94
Q

What type of valve is installed when two or more pumps are connected to the same suction line?

A

Gate valves

95
Q

(True or False) When installing valves in the discharge piping, you should install both a check valve and gate valve in the discharge piping.

A

True

96
Q

What value is the pressure of flushing or lubricating liquid set above the maximum expected stuffing box operating pressure?

A

5 - 10 psi

97
Q

Within how many days of shipment is an installed pump packing considered good for operation?

A

60

98
Q

The filter contained in a double seal mechanical seal must be capable of screening out all particles above how many microns?

A

25

99
Q

What is the most common cause of overheating of pumps?

A

Excessive grease

100
Q

For average operating conditions, it is recommended that 1 ounce of grease be added at what monthly intervals?

A

3 to 6 months

101
Q

What is the maximum desirable operating temperature for bearings?

A

180°F

102
Q

In installations with moderate temperature changes and humidity, the oil should be changed after approximately how many hours of operation?

A

160 hours

103
Q

What are air compressors sometimes referred to as?

A

Air pumps

104
Q

The majority of air compressors used throughout the Seabees are driven by what power source?

A

Electric motors

105
Q

What causes the intake valve on an air compressor to open?

A

Suction stroke

106
Q

The pistons contained within the air compressor are called by what terms?

A

Trunk or differential

107
Q

Which piston minimizes cylinder wall wear?

A

Trunk

108
Q

What piece of equipment on compressors allows for the unloading and control systems to be integrated?

A

Constant speed control

109
Q

When the compressor reaches near normal speeds, the solenoid valve will be in what state?

A

Energized

110
Q

(True or False) Intercoolers cool the compressed air charge before it is drawn into the next cylinder.

A

True

111
Q

As the second stage cartridge on a compressor engine loads up with dirt, what color indicator will be displayed to the operator?

A

Red

112
Q

What assures rapid warm-up and optimum compressor performance over a wide range of surrounding air temperatures?

A

Combination of thermostatic valve and bypass

113
Q

Compressed air falls into how many different categories?

A

3

114
Q

A low pressure air system delivers air up to how many psig?

A

125 psig

115
Q

What is the upper psig value of a high pressure air system?

A

6000

116
Q

What is a typical application associated with a medium air pressure system?

A

Hydraulic lifts

117
Q

What type of pipe is used in low and medium air pressure systems?

A

Black steel

118
Q

Aboveground pipe is pitched downward a minimum of how many inches per 100 feet of length?

A

3”

119
Q

How many different types of air filters are used in air compressors?

A

2

120
Q

What three types of dryers are used with air compressors?

A

Absorption, refrigeration, and deliquescent

121
Q

What action is required when the air discharge temperature on the 1st stage exceeds 400°F?

A

Secure compressor

122
Q 
Which inspection is conducted annually on aboveground systems?
A. Dirt accumulation in strainers
B. Condition of flanged fittings
C. Obstructed pipelines
D. Excessive leakage
A

B. Condition of flanged fittings

1. UT Basic/ Advanced (25 decks)

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