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1. UT Basic/ Advanced > UTA10 AC/R > Flashcards

UTA10 AC/R Flashcards

1
Q

What is the wastewater of community life? (Page 10-1)

A

Sewage

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2
Q

The major sources of raw sewage are domestic sewage, industrial sewage, and what else? (Page 10-1)

A

Storm water

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3
Q

Heavy input of storm water can disturb the opera- tion of a treatment plant by sending it too much water, a problem called what? (Page 10-2)

A

Hydraulic overloading

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4
Q

The color of wastewater containing dissolved oxygen (DO) is normally what color? (Page 10-3)

A

Gray

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5
Q

Black-colored wastewater usually accompanied by foul odors, containing little or no DO, is said to be what? (Page 10-3)

A

Septic

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6
Q

Those solids that are not dissolved in wastewater are called what? (Page 10-4)

A

Suspended solids

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7
Q

What term is used to describe the acid or base properties of water solutions? (Page 10-5)

A

pH

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8
Q

A pH value less than what is acidic? (Page 10-6)

A

7

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9
Q

What are life-supporting nitrogen and phosphorus? (Page 10-7)

A

Nutrients

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10
Q

The three biological organisms present in wastewater are bacteria, viruses, and what else? (Page 10-8)

A

Parasites

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11
Q

What type of bacteria can live with or without dissolved oxygen? (Page 10-8)

A

Facultative

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12
Q

A grab sample is a single sample of wastewater taken over a short span of time, usually less than how many minutes? (Page 10-8)

A

15

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13
Q

Pure water at 20°C at sea level can hold a maximum of how many mg/l of DO? (Page 10-15)

A

9.17

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14
Q

What test is often used with all kinds of activated sludge plants to find the amount of solids in aeration units? (Page 10-22)

A

Settleability

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15
Q

What test is the most important test for finding the polluting strength of a wastewater? (Page 10-22)

A

5 Day Biochemical Oxygen Demand test

BOD5

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16
Q

Influent wastewater may have as much as how many mg/l of suspended solids? (Page 10-23)

A

400

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17
Q

What test is an indicator of harmful bacteria in the wastewater? (Page 10-23)

A

Fecal coliform

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18
Q

A report is required for all wastewater plants on a military installation how often? (Page 10-24)

A

Monthly

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19
Q

All plants that discharge an effluent must have NPDES permits issued by the what? (Page 10-27)

A

EPA

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20
Q

The minimum acceptable size of septic tank is how many gallons? (Page 10-32)

A

1,000

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21
Q

The physical location of a septic tank in relation to wells must be no closer than 100 feet from a shallow well and no closer than how many feet from a deep well? (Page 10-34)

A

50

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22
Q

What are usually dry-laid masonry or brick-lined wells without any masonry at the bottom? (Page 10-34)

A

Cesspools

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23
Q

Leaching cesspools should not be placed closer together than how many feet by out-to-out measurement of walls? (Page 10-36)

A

20

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24
Q

The lines in a leaching fields are built of how many-inch PVC perforated pipe? (Page 10-37)

A

4

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25
Q

(True or False) Once the type of air-conditioning system has been chosen, the next step is to figure out its appropriate size.

A

True

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26
Q

What is the temperature range of the cylinders that store the liquid refrigerant in an expandable evaporator system?

A

−20°F to −60°F

textbook says 60°F instead of -60°F

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27
Q

(True or False) The compound refrigeration system allows two different refrigerants to be used, and can produce temperatures as low as −50°F.

A

False

It uses 2 or more compressors with the same refrigerant
AND
It can attain −80°F.

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28
Q

What type of blower evaporator is designed for mounting behind windows and door frames?

A

Vertical flat-type

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29
Q

What electrical room thermostats are usually 115 volts, are dangerous to the user, and are more expensive?

A

Line-voltage

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30
Q

(True or False) The three pressures that affect the operation of the TEV are; bulb, evaporator, and spring.

A

True

31
Q

What type of single-phase motor has limited starting torque and is usually used with window air conditioners?

A

Permanent split-phase motor

32
Q

How many electrical terminals do hermetic motors have that are connected through an insulated seal to the motor windings inside the dome?

A

3

33
Q

What are the two basic types of circuits?

A

Load and control

34
Q

Which method is used to test windings for grounds?
A. Ohmmeter continuity test
B. Test lamp continuity check
C. Resistance measurement with a megohmmeter
D. All of the above

A

D. All of the above

35
Q

(True or False) The first step in performing an ohmmeter continuity test is to disconnect the power and remove the wires from the motor terminals.

A

True

36
Q

What type of starting relay is electromagnetic and is used with split-phase induction-run motors?

A

Current relay

37
Q

When a starting relay fails, which device can be used to start the compressor motor by bypassing the relay manually?

A

A test line cord, fuse and capacitor

38
Q

What type of air-conditioning system should be used when the areas to be air- conditioned are in close proximity to each other?

A

Forced air units

39
Q

What type of manifold gauges are needed when working on an ammonia- absorption refrigeration system?

A

Steel manifold gauges

40
Q

What type of evaporator system is used to preserve the freshness of fruits, vegetables, meats, and fish?

A

Spray evaporator systems

41
Q

What type of refrigeration system has no moving parts?

A

Thermoelectric refrigeration systems

42
Q

What maximum temperature can be maintained in a cascade refrigeration system?

A

−50°F

43
Q

What maximum temperature can be attained in a three-stage compound refrigeration system?

A

−135°F

44
Q

When mounting a condenser on a roof, what consideration is considered the most important?

A

Roof load strength

45
Q

What types of metal are used in a bimetal thermostat?

A

Brass and Invar

46
Q

What type of thermostat uses 24 volts?

A

Low-voltage

47
Q

What is the most commonly used metering device?

A

Thermal expansion valve (TEV)

48
Q

Which of the following types of motors should be used for 5-horsepower, high- starting torque requirement?

A

Capacitor-start, capacitor-run

49
Q

Which of the following components is considered a load?

A

Compressor contactor

50
Q

Which of the following conditions exists in the case of a shorted-winding?

A

A loop of cooper wire is in contact with another wire

51
Q 
Which of the following devices can be used to test a hermetic motor for grounds?
A. Ohmmeter
B. Test lamp
C. Megger
D. All of the above
A

D. All of the above

52
Q

Which starting relay is capable of de-energizing the running winding circuit when the circuit draws excessive current?

A

Thermal Relay

53
Q

(True or False) When checking relay contacts, voltage and thermal relay contacts are normally open.

A

False

Their normally closed

54
Q

When testing a capacitor with an ohmmeter, what general reading on the meter indicates the capacitor is good?

A

0 or low resistance then climbs to high resistance

55
Q

What are used when the areas to be air-conditioned are close to each other, are being used for similar purposes, or have the same humidity and comfort zone requirements? (Page 14-1)

A

Forced air units

56
Q

There are how many general factors that affect the refrigeration heat-load estimate required for a particular application? (Page 14-3)

A

Five

57
Q

An absorption refrigeration system uses either water, ammonia, or what else as the refrigerant? (Page 14-3)

A

Lithium bromide

58
Q

What will instantly freeze any part of the human body that it touches? (Page 14-6)

A

Liquid nitrogen

59
Q

What system uses two or more compressers connected in series in the same refrigeration system? (Page 14-7)

A

Compound

60
Q

A two-stage compound system can attain a temperature of approximately what? (Page 14-9)

A

–80°F

61
Q

Electrical room thermostats are in three categories: line voltage, low voltage, and millivoltage. Line-voltage thermostats are usually how many volts? (Page 14-13)

A

115

62
Q

The millivoltage thermostat operates at 750, 500, or how many millivolts? (Page 14-12A)

A

250

63
Q

One component that enhances the operation of a thermostat is a what? (Page 14-12A)

A

Anticipator

64
Q

Basically, there are four types of single-phase motors used in hermetic assemblies: the split- phase; the capacitor-start, induction- run; the capacitor-start, capacitor-run; and the what? (Page 14-16)

A

Permanent split-phase

65
Q

There are two basic types of circuits, what are they? (Page 14-19)

A

Load and control

66
Q

What is the result of a burned-out or grounded fault or simply a break somewhere in the lead or winding that prevents the current from completing the circuit? (Page 14-18E)

A

Open winding

67
Q

What can be used to check windings for shorts? (Page 14-20)

A

Ohmmeter

68
Q

What is the result of an electrical conductor in contact, either directly or indirectly, with the motor frame or the metal shell of the unit? (Page 14-20)

A

Ground

69
Q

Three methods of testing windings for grounds are the ohmmeter continuity test, the test lamp continuity check, and the resistance measurement with a what? (Page 14-20)

A

Megohmmeter

70
Q

Electrical components in hermetic motor compressor circuits that give trouble include starting relays, overload protectors, and what else? (Page 14-21)

A

Capacitors

71
Q

What is an electromagnet, similar to a solenoid valve, that employs a weight and spring to hold the contacts open when the circuit is idle? (Page 14-21)

A

Current relay

72
Q

What operate on the theory that electrical energy can be turned into heat energy and that, when the temperature of a metal is increased, the metal expands? (Page 14-22)

A

Thermal relays

73
Q

What type of capacitor serves to provide a smoother and quieter operating motor? (Page 14-23)

A

Run

74
Q

All wiring circuits are built around how many requirements? (Page 14-25)

A

Four

1. UT Basic/ Advanced (25 decks)

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