UTB7 Prime Movers Pumps and Compressors

Question 1

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)

Answer 1

Hydrologic

Question 2

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)

Answer 2

Surface water

Question 3

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)

Answer 3

Groundwater

Question 4

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

Answer 4

Dissolved Impurities

Question 5

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

Answer 5

Suspended Impurities

Question 6

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

Answer 6

Two

Question 7

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)

Answer 7

Typhoid Fever

Question 8

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

Answer 8

Diatomaceous silica

Question 9

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

Answer 9

Chlorine

Question 10

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)

Answer 10

10

Question 11

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)

Answer 11

5

Question 12

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)

Answer 12

30 minutes

Question 13

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

Answer 13

pH

Question 14

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

Answer 14

14

Question 15

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)

Answer 15

70°F

Question 16

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)

Answer 16

20

Question 17

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

Answer 17

1:460

Question 18

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

Answer 18

10

Question 19

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

Answer 19

Hypochlorinators

Question 20

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)

Answer 20

Vitreous crocks

Question 21

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

Answer 21

Muriatic acid

Question 22

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)

Answer 22

80°F

Question 23

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

Answer 23

1 gallon

Question 24

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

Answer 24

Orthotolidine-arsenite (OTA)

Question 25

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

Answer 25

pH

Question 26

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)

Answer 26

Alkaline

Question 27

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

Answer 27

Alkalinity

Question 28

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)

Answer 28

Jar test

Question 29

Which common type of drive is used with electric motors?

Answer 29

Flexible coupling

Question 30

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?

Answer 30

390°F

Question 31

Which desiccant compound is utilized in the air dryer?

Answer 31

Silica gel

Question 32

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

Answer 32

Drive

Question 33

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

Answer 33

Rotating-field induction

Question 34

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

Answer 34

Electromagnetic induction

Question 35

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

Answer 35

Frequency of electric power source varies.

Question 36

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

Answer 36

One

Question 37

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

Answer 37

To store electricity for more power during startup.

Question 38

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

Answer 38

Ring

Question 39

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

Answer 39

Rapid wear of bushing pins

Question 40

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

Answer 40

Too little tension

Question 41

What does excessive belt rubbing on the sheaves indicate?

Answer 41

Belt slippage

Question 42

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

Answer 42

All belts require replacement

Question 43

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

Answer 43

Vacuum

Question 44

Diesel engines convert what type of energy into mechanical energy?

Answer 44

Heat

Question 45

What could result from sudden cooling of a diesel engine?

Answer 45

Crack cylinder heads

Question 46

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

Answer 46

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

Question 47

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

Answer 47

30 seconds

Question 48

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

Answer 48

15 to 30 minutes

Question 49

Most gasoline engines operate on a ____ stroke cycle

Answer 49

4

Question 50

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

Answer 50

Before being admitted to the cylinder

Question 51

How does the diesel engine produce combustion?

Answer 51

Heat of compression

Question 52

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

Answer 52

True

Question 53

How many types of head are there in pump operation?

Answer 53

4

Question 54

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

Answer 54

Suction head

Question 55

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

Answer 55

Discharge head

Question 56

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

Answer 56

Total discharge head

Question 57

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

Answer 57

Inches of mercury

Question 58

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

Answer 58

Cavitation

Question 59

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

Answer 59

Check valve

Question 60

How are pump types classified?

Answer 60

By the type of movement causing their pumping action

Question 61

What is another term used for rotary pumps?

Answer 61

Positive displacement

Question 62

Which application is associated with rotary pumps?

Answer 62

Transport of JP-5 fuel

Question 63

Rotary pumps are classified by the type of _____.

Answer 63

Rotating element employed

Question 64

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

Answer 64

Reciprocating

Question 65

``` 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 ```

Answer 65

Vertical stroke pressure

Question 66

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

Answer 66

Direct acting

Question 67

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

Answer 67

Diaphragm

Question 68

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

Answer 68

Mud hog

Question 69

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

Answer 69

Simplex

Question 70

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

Answer 70

True

Question 71

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

Answer 71

Horizontal

Question 72

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

Answer 72

Closed

Question 73

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

Answer 73

Diffuser vanes

Question 74

Which type of centrifugal pump is used to pump wells?

Answer 74

turbine well pumps

Question 75

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

Answer 75

22

Question 76

(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.

Answer 76

False | 50 pounds of steam

Question 77

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

Answer 77

Vibration

Question 78

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

Answer 78

Discharge stop valve

Question 79

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

Answer 79

A. Disk

Question 80

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

Answer 80

Carbon

Question 81

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

Answer 81

5 drops per minute

Question 82

What is used to level pumping units?

Answer 82

Jacking screws

Question 83

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

Answer 83

0.015 - 0.030

Question 84

What type of pump is exclusively used in well pumping?

Answer 84

Air-lift pumps

Question 85

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

Answer 85

Compressed air

Question 86

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

Answer 86

Percentage of submergence of the foot piece

Question 87

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

Answer 87

Decreases

Question 88

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

Answer 88

3/4 - 1

Question 89

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

Answer 89

Spirit level

Question 90

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

Answer 90

Pump shaft and drive shaft

Question 91

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

Answer 91

48

Question 92

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

Answer 92

Tie bolts

Question 93

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

Answer 93

Foot valve

Question 94

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

Answer 94

Gate valves

Question 95

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

Answer 95

True

Question 96

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

Answer 96

5 - 10 psi

Question 97

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

Answer 97

60

Question 98

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

Answer 98

25

Question 99

What is the most common cause of overheating of pumps?

Answer 99

Excessive grease

Question 100

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

Answer 100

3 to 6 months

Question 101

What is the maximum desirable operating temperature for bearings?

Answer 101

180°F

Question 102

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

Answer 102

160 hours

Question 103

What are air compressors sometimes referred to as?

Answer 103

Air pumps

Question 104

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

Answer 104

Electric motors

Question 105

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

Answer 105

Suction stroke

Question 106

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

Answer 106

Trunk or differential

Question 107

Which piston minimizes cylinder wall wear?

Answer 107

Trunk

Question 108

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

Answer 108

Constant speed control

Question 109

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

Answer 109

Energized

Question 110

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

Answer 110

True

Question 111

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

Answer 111

Red

Question 112

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

Answer 112

Combination of thermostatic valve and bypass

Question 113

Compressed air falls into how many different categories?

Answer 113

3

Question 114

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

Answer 114

125 psig

Question 115

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

Answer 115

6000

Question 116

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

Answer 116

Hydraulic lifts

Question 117

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

Answer 117

Black steel

Question 118

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

Answer 118

3"

Question 119

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

Answer 119

2

Question 120

What three types of dryers are used with air compressors?

Answer 120

Absorption, refrigeration, and deliquescent

Question 121

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

Answer 121

Secure compressor

Question 122

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

Answer 122

B. Condition of flanged fittings