Brainscape's Knowledge GenomeTM

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


See full index

Advanced Steamfitter > Refrigeration and Basic HVAC Systems > Flashcards

Refrigeration and Basic HVAC Systems Flashcards

1
Q

A _____ system is one which the evaporator coil comes into direct contact with the medium to be cooled.

A

Direct

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

Skating rinks use _____ as the medium to obtain low temperatures necessary for the ice surface and prevent the secondary refrigerant from freezing.

A

Brine

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

In an ammonia absorption system, the ammonia is heated into a vapor by a _____ coil located in the generator (concentrator).

A

Steam

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

In an ammonia absorption system, the condenser would change the high pressure vapor into high pressure ______.

A

Liquids

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

In an ammonia absorption system, the ______________ would separate the high side condenser from the low side evaporator.

A

Metering Valve

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

In an ammonia absorption system, the secondary refrigerant located in the evaporator would be ________ when used in a building cooling system.

A

Chilled Water

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

Refrigeration is the science of producing and maintaining temperatures below that of the surrounding ________ by transferring heat from one place to another.

A

Atmosphere

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

Refrigeration engineers, particularly those associated with ________, finally decided to call all fluids used in refrigeration systems refrigerants with an identification number to cover all refrigerants.

A

ASHRAE

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

The ________ components of these refrigerants have been found to contribute significantly to the depletion of the ozone layer.

A

Chlorine

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

Group _____ refrigerants are considered dangerous and should only be used for industrial applications.

A

A3

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

The presence of escaping refrigerant will cause the flame of a ________ torch to turn green if there is a small leak or dense blue if there is a large leak.

A

Halide

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

Refrigeration R-717, more commonly known as _________, is one of the oldest refrigerants and because of its heat-absorbing ability is considered one of the best.

A

Ammonia

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

Too much oil accumulation in the ______ and ________ could cause there to be a shortage of oil in the crankcase of the compressor.

A

Evaporator and condenser

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

In the mid 1980s, the ______ _______ was established to ban, limit, and replace the existing CFC type refrigerants.

A

Montreal Protocol

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

The new refrigerants use _________ oil.

A

Polyester

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

A piston type compressor is classified as _________.

A

Reciprocating

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

_________ units contain a compressor that is directly coupled to an electric motor, both of which are sealed inside a welded steel case.

A

Hermetic

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

An ________ type compressor will have a shaft protruding outside of the body connected to a motor by either a pulley or a direct drive coupling.

A

Open

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

The evaporators will ______ the heat from the medium being cooled.

A

Absorb

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

The compressor generates the high and low side of the system; it will also create ________ ___ ___________ when the refrigerant passes through the exhaust portion of the compression cycle.

A

Heat of Compression

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

The type of evaporator that is widely used in air conditioning applications where the dry or direct expansion method is used would be a ___________ coil type.

A

Finned Tube

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

The shell and tube evaporator is referred to as a _______ and is used to cool a secondary refrigerant.

A

Chiller

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

The three basic types of condensers are _________, ____________, and ___________.

A

Air Cooled, Water Cooled, and Evaporative

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

To increase condenser capacity, air can be forced or drawn through the condenser could by means of ______ or ______.

A

Blowers or Fans

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

The evaporative condenser uses both conduction and evaporation for the rejection of the heat process. To make up water due to the evaporation process, you would install a ___________ in the pan.

A

Float Valve

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

To remove non-condensable gases and moisture prior to adding refrigerant to the system; the entire system would need to be _________.

A

Evacuated

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

Liquid receivers are built to the ASME _________ code.

A

Section VIII

28
Q

The flow control device establishes a pressure differential between the ________ and the ________.

A

Condenser and Evaporator

29
Q

_______ type metering valves are used in conjunction with the flooded evaporator.

A

Float

30
Q

________ _________ is not suitable for air conditioning systems where the load is frequently changed since they do not respond to changes in temperature.

A

Constant pressure

31
Q

The __________ valve opens and closes in response to the downstream superheated temperatures of the evaporator.

A

Thermostatic

32
Q

The orifice or capillary tube will allow the refrigerant in the system to ________ _________ when the compressor is off.

A

Equalize pressure

33
Q

The high side of a refrigeration system would not include:

A

An intake valve on compressor

34
Q

A flooded evaporator would have a ________ metering valve.

A

High side float

35
Q

An example of an indirect refrigeration system is a:

A

Pipe coil in a curling rink

36
Q

Where a condenser is used, the best type for heat removal is an:

A

Evaporative

37
Q

The type of metering valve that is manually operated and will require continuous supervision is the:

A

Needle valve

38
Q

The thermostatic metering valve operates by sensing:

A

Superheat

39
Q

The type of valve that senses temperature change with a thermistor is a:

A

Thermal-electric valve

40
Q

A one pipe system is ideally suited for:

A

Perimeter baseboard installations

41
Q

A three pipe system will not contain:

A

A split AC system

42
Q

A chilled water coil will be:

A

Piped opposite of the steam coil.

43
Q

The three (3) most important principles of air factors used on an air conditioning system is:

A

Temperature, humidification and air motion

44
Q

Bacteria and disease can be controlled by using:

A

Filtration

45
Q

A priority of air conditioning in pulp mills is to:

A

Reduce the amount of humidity

46
Q

(T/F) Heat always flows from a lower temperature substance to a higher temperature substance.

A

False

47
Q

(T/F) A heat pump can be used for both heating and cooling, regardless of the season.

A

True

48
Q

(T/F) The water source is the most common type of energy source used for a heat pump.

A

False

49
Q

(T/F) Geothermal heat pumps can be classified as either open loop or closed loop systems.

A

True

50
Q

(T/F) There are only two heat pump cycles.

A

True

51
Q

(T/F) The variable heat pumps have moving dampers and a fixed refrigeration cycle.

A

False

52
Q

The type of filter that can be reused and regenerated using an oil based substance is:

A

Viscous impingement type

53
Q

The most common type of fan or blower used on a furnace or an RTU is the:

A

Squirrel cage fan

54
Q

The type of air conditioning equipment that requires the most service is the:

A

RTU - unitary

55
Q

Downstream of a dual-duct mechanical room, each air conditioned room or area is required to have a _________ installed.

A

Mixing box

56
Q

The type of ducting designed for high-velocity ducting is a:

A

Round duct

57
Q

An essential item required on a steam heating coil with an automatic control valve is a:

A

Vacuum breaker

58
Q

The type of coil design that is used when air temperature across a coil is greater than 35°F and 55°F is:

A

Installed two deep

59
Q

Cooling towers are interconnected to:

A

Condensers

60
Q

The most common energy source for a heat pump is:

A

Air source

61
Q

A variable heat pump system will have:

A

Two metering valves

62
Q

The fixed heat pump system will control the heat/cool cycle by the use of:

A

Motorized dampers

63
Q

Icing of the evaporator is caused by:

A

Low refrigerant pressure in the evaporator

64
Q

The receiver on a refrigeration system is located:

A

Upstream of the filter/ dryer

65
Q

The safety valve from a receiver should be piped:

A

Away from air intakes

Advanced Steamfitter (8 decks)

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