Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Plumbing Level 3 > G UNIT: Self test questions > Flashcards

G UNIT: Self test questions Flashcards

1
Q

What is considered to be the core of a heat pump system?

A

The refrigeration cycle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the fourth component of a refrigeration system?

A

An evaporator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the term given to the additional heat that is required to raise the temp of the refrigerant above its saturation temp?

A

Superheat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Which component of a refrigeration system is responsible for absorbing heat from a source into the refrigerant?

A

The evaporator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Which component of a refrigeration system is responsible for “dumping” heat from the system to a load?

A

The condenser

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

In a cooling only scenario, what would be the vehicle responsible / would be mounted within the ductwork?

A

The evaporator

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What component is responsible for allowing a heat pump to either heat or cool a load?

A

The reversing valve

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What type of pump is most commonly used in homes in North America?

A

Air - to - Air

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the term given to the pair of copper tubes that move refrigerant between the evaporator and compressor?

A

Lineset

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What my be required if an Air- to Air heat pump can’t keep up with the building heat loss in very cold climates?

A

An auxiliary electric heater installed in the supply ductwork

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What component will aid in keeping a cooling coil in a furnace’s supply duct from becoming plugged?

A

A high - quality air filter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What component, when installed with an air - to - water heat pump, eliminates the need for having to freeze - protect the entire distribution system?

A

A heat exchanger

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

If a heat pump pulls low temp heat from vertical loops installed in a well / transfers it to a coil in a forced - air furnace, what variety of heat pump is it?

A

Water - to - Air

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

A coil installed within a supply duct on a heat pump, intended to heat the air, would be an example of what component?

A

A condenser

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

A heat pump installed to heat or cool a building through a radiant floor system by using the heat from an earth loop would be an example of what type of heat pump?

A

Water - to - Water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What represents the heating efficiency of a heat pump?

A

Coefficient of Performance (COP)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What represents the cooling efficiency of a heat pump?

A

Energy Efficiency Rating (EER)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Water to water heat pumps in heating mode work best when…

A

the source temp is highest / load temp is lowest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is one ton of cooling equivalent to?

A

12,000 BTUH

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

When determining a COP for the heating side of a heat pump, what are the units of measurement for the electrical energy input?

A

Watts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

water - to - water heat pumps in cooling mode work best when…

A

The source temp is highest and the load temp is lowest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

In order to keep the EER if a heat pump in cooling mode as high as possible, what is the max suggested flow rate through either the evaporator or condenser?

A

3 GPM

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Why are earth (ground) loops considered to be a better heat pump source media than air?

A

Because the ground temp is more consistent year - round as compared to air temp year round

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What is the piping material most commonly used in ground - source heating?

A

HDPE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

At least how many GPM / ton would be required in a water - to - water or water - to - air heat pump?

A

3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

When using open - loop systems, what are the characteristics of water that are of most concern?

A

Quantity and Quality

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

In an open loop system using lake water as the source, what is used to allow periodic replacement of the pump?

A

A sleeve on the intake line and a vault.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

What two components of an open - loop well system are similar or identical to those found in a well system for a house?

A

A hydro - pneumatic tank + pressure switch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

If a chain trencher is used, how many pipes can be buried in the trench?

A

1 or 2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

What is the normal capacity of a 6” vertical borehole in feet per ton of capacity?

A

125 - 150

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

What is used in a borehole to increase the thermal conductivity between the tubing and the earth around it?

A

Sand and Bentonite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

How are the manifolds piped in a vertical field?

A

In a reverse - return configuration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

What is the material that is most commonly used for earth - loop piping?

A

HDPE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

How is earth loop piping joined?

A

Using heat - fusion methods

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

If manifolds are installed inside a building, how many wall penetrations will there be?

A

Two for each field loop

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

What is not an advantage to installing manifolds within the building?

A

There are many pipe penetrations through foundation walls

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

What is not an advantage to installing vertical, rather than horizontal, earth loops?

A

Specialized well - drilling equipment / personnel is needed.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

What is the accepted pressure / duration of the air test on all buried piping in earth - loop installations?

A

75 psi for 24 hours

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

What is power - purging?

A

Removing trapped air by using high - velocity water flows

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

What type of antifreeze solution was used in early versions of geothermal heat pumps field loops but is no longer the industry standard?

A

Calcium chloride - based (Brine?)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

What type of heating system is best suited for use with geothermal heat pumps?

A

Radiant floor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

The installation of what piece of equipment helps ensure that a heat pump in a multiple - zone heating system doesn’t short cycle when only one or two zones are calling for heat?

A

Buffer tank

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

What control component is used to maintain the temp of the water in a buffer tank and thereby eliminate the need for a mixing valve?

A

An outdoor reset controller

44
Q

What is water that is taken to low temp / used for cooling known as?

A

Chilled water

45
Q

What is moisture removal from interior air, for cooling / comfort purposes, known as?

A

Latent cooling

46
Q

What is the most important consideration for cooling systems in order to avoid damage to the building

A

Condensate collection / removal

47
Q

What is the condensate from a chilled water terminal unit considered to be?

A

Clear water waste

48
Q

Besides being insulated, what other protection is needed to prevent piping / associated fittings from causing condensation issues?

A

They must be hermetically sealed

49
Q

What variety of heat pump is most common for residential use in Canada?

A

Air - to - Air

50
Q

What is a Desuperheater?

A

A heat exchanger

51
Q

What is the min suggested rate of purging (flushing) in order to remove unwanted debris trapped air from earth loops / manifolds

A

2 ft / sec

52
Q

What should be the min capacity of a purge barrel?

A

30 gallons

53
Q

What component of an earth - loop system will remove dissolved air from the piping, just as it does when installed in a hydronic heating system?

A

A microbubble resorber

54
Q

What is the median (average) % of glycol / water mixture used in antifreeze systems for heat pumps?

A

20% glycol / 80% water

55
Q

Where is the lowest point (min water level) that liquid should be when using a purge barrel to flush or add glycol to the system, in order to prevent air from being drawn in with the liquid?

A

1” above the highest opening in the pump intake line

56
Q

What components would have to be installed in any closed earth - loop system, to avoid issues caused by fluid temp variations?

A

An expansion tank

57
Q

For calculation purposes, what is usually used as the water temp at time of filling the system?

A

50F –> 10C

58
Q

What doesn’t have to be done routinely as part of regular system maintenace?

A

Dump, flush and refill all closed system piping
(Closed system have to remain closed)

59
Q

What is the type of radiation that strikes that earth’s surface and is easy to reflect using mirrors?

A

Direct

60
Q

What is the type of radiation that is reflected in every direction due to particles in the air / that cannot be easily reflected?

A

Diffuse

61
Q

Which one of the following can be viewed as the position or change in the sun’s path across the sky in the different seasons?

A

Solar declination angle

62
Q

Which one of the following is measured from true north in a clockwise direction, with the south pole being 180 degrees?

A

Solar azimuth angle

63
Q

What is the difference between compass - indicated north/south and true (polar) north / south known as?

A

Magnetic declination

64
Q

What describes the type of system that might use large south facing windows / bare concrete floors to absorb heat during the say and release it at night?

A

Direct - gain passive

65
Q

What is the term known as whereby heat from the solar storage tank is lost to the collectors through convection currents?

A

Thermosiphoning

66
Q

What is the term given to any system that uses a circulator to move a fluid through collectors

A

Active thermal

67
Q

What type of finish on the tubes and sheets helps w/ the collection of heat by a flat plate solar collector?

A

Black matte

68
Q

What type of solar collector is built somewhat like a thermos bottle?

A

Evacuated tube

69
Q

What type of installation is well suited to the use of collectors that are of the unglazed, uninsulated flat plate UV stabilized polymer variety?

A

Swimming pool

70
Q

What collector criteria is the result of an equation that factors in the collector inlet fluid temp, ambient air temp and solar radiation intensity?

A

Inlet fluid parameter

71
Q

At what time of day is solar direct radiation the strongest, no matter what the latitude of the location?

A

12pm

72
Q

What contributes to the most to achieving the best collector performance?

A

Low collector inlet fluid temp

73
Q

What is the term given to a high-temp situation in the collectors that is caused by unusually high sustained direct radiation / low flow conditions?

A

Stagnation

74
Q

What component prevents thermosiphoning of the heated water in the thermal storage tank?

A

Check valve

75
Q

What component ensures that water won’t be circulated through the collectors unless there is enough heat there?

A

Check valve

76
Q

What component is needed on an antifreeze system so that collector fluid and heat load fluid are kept separate from each other?

A

Heat exchanger

77
Q

What condition would required the use of two circulators to introduce heated water to the thermal storage tank?

A

An antifreeze loop with an external heat exchanger

78
Q

What uses a tank / properly - graded piping for freeze protection?

A

Drain-back system

79
Q

What must not have a check valve in the collector supply piping nor an air vent at the top of the collector array?

A

Closed loop drain-back system

80
Q

What critical component of device is necessary at the outlet of solar domestic hot water tank to protect users of system water?

A

A tempering valve

81
Q

What principle ensures that the coolest water in the tank is fed to the collectors, thereby ensuring higher collector efficiency?

A

Stratification

82
Q

Complete the following statement: The flow pattern through brazed plate heat exchangers

A

should be piped in a counterflow pattern between the two mediums

83
Q

What is not a principle to be considered when using solar for space heating?

A

The need for cross connection control is never a consideration

84
Q

Which space heating system is ideally suited to an active solar system?

A

Hydronic radiant floor

85
Q

What is not used to ensure hydraulic separation between primary and secondary circulators in a hydronic system’s primary loop?

A

a 3 way mixing valve

86
Q

What determines the system pressure in a closed loop drainback system?

A

The liquid level in the drainback tank

87
Q

What does a drainback system contain?

A

a circulator
an air riser tube
a pressure relief valve

88
Q

On a solar system suppling heat for a forced air system, what component prevents excessively hot water from reaching the coil in the furnaces supply plenum?

A

a 3 way mixing valve

89
Q

What provides the hydraulic separation between the primary and secondary loops?

A

The hydrolink

90
Q

What is the control strategy called that shuts off space heat when domestic water needs to be heated in a combi-system?

A

Priority

91
Q

What is the control that is normally used to automatically adjust the water temp to a radiant floor system, depending on the temp outdoors but can also be used to monitor the water temp at the top of the thermal storage tank?

A

Outdoor reset

92
Q

On which side of a hydronic system the radiant floor panels be found?

A

The load side

93
Q

What is the single most important consideration in a solar thermal system?

A

The placement of the solar collectors

94
Q

Between what hours of the day is potential shading of the collectors most critical?

A

9 am - 3 pm

95
Q

What would be the issue of most concern when using an engineer - designed pedestal base to support a solar thermal array?

A

Support / protection of piping

96
Q

What protection should also be installed along with insulation for supply / return piping?

A

Aluminum or plastic covers

97
Q

What is the optimum azimuth angle for collectors installed in the northern hemisphere?

A

180 degrees

98
Q

What is the optimal collector angle or “tilt” when used for domestic water heating?

A

The same as the local latitude

99
Q

What is the preferred type of pipe or tube and joining method used in solar thermal systems?

A

Copper tube with pressed connections

100
Q

What Canadian - based software program, developed to simulate / estimate the performance of a solar thermal system?

A

RETScreen

101
Q

What is the term “solar fraction” used to describe?

A

The % of the month by month total energy load that is met by an active solar system

102
Q

What would be the best storage tank w/ on or two internal coils?

A

An indirect storage - type heat exchange

103
Q

What device should always be installed on the hot water outlet of any thermal storage tank that feeds the potable water system?

A

An anti-scald valve

104
Q

What device contains “pete’s plugs” that allow a pressure differential to be read across it?

A

a circuit setter

105
Q

Whenever a cross connection may exist between a potable water system and the solar thermal system, which one of the following would be considered the best choice for protection of the potable system?

A

An RPBA

Plumbing Level 3 (26 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions