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1. UT Basic/ Advanced > UTB13 Air Conditioning > Flashcards

UTB13 Air Conditioning Flashcards

1
Q

What is the term used for the range of effective temperatures that most people feel comfortable in?

A

Comfort zone

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2
Q

(True or False) Using electricity to clean the air of large air-conditioning systems is the best method and the cheapest.

A

True

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3
Q

Which of the following is another name for a floor-mounted air-conditioning unit?

A

Package unit

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4
Q

What type of system is used for air conditioning large tonnage capacities?

A

Water chillers

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5
Q

(True or False) The lubrication of fan bearings should be done when the unit is running.

A

False

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6
Q

What type of cooling tower requires a completely open space because its performance depends on existing air currents?

A

Natural draft

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7
Q

Which of the following reciprocating compressors is driven by an external motor?

A

Open

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8
Q

What type of swash plate compressor uses a plate connected to a hinge pin that permits the swash plate to change its angle?

A

Five-cylinder variable

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9
Q

What type of suction pressure-regulating valve uses a sealed pressure element to maintain a constant pressure independent of the altitude of the vehicle?

A

Pilot operated absolute (POA) valve

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10
Q

Which of the following refrigerants has replaced R-113 as a primary flushing agent used for cleaning a system?

A

R-141b

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11
Q

What classification of air ducts takes air from the conditioned space and then distributes it back into the air conditioner system?

A

Conditioned air

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12
Q

Which of the following duct components is used to deliver a concentrated air stream into a room?

A

Registers

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13
Q

(True or False) A radial flow fan can be belt-driven or direct-drive.

A

True

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14
Q

What is the term given to the net effects of temperature, humidity, and air motion?

A

Effective temperature

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15
Q

(True or False) Electricity can be used to purify the air in some large air- conditioning systems.

A

True

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16
Q

Window-mounted air-conditioning units usually range from 4,000 to ______ Btu per hour in capacity.

A

36,000

17
Q

(True or False) Flooded shell-and-tube coolers use less refrigeration than other systems of equal size.

A

False

18
Q

What type of condenser is used for practically all water-cooled refrigeration systems?

A

Shell-and-tube

19
Q

Cooling towers have been linked to the spread of what disease?

A

Legionnaire’s disease

20
Q

How much Btu is required to evaporate 3 gallons of water?

A

1 pound of water = 8.3

  1. 3 x 3 = 24.9
  2. 9 x 1,000 = 24,900
21
Q

What type of compressor is used in large air-conditioning systems that handle large volumes of refrigerants at low-pressure differentials?

A

Centrifugal

22
Q

What air-conditioning control is an adjustable temperature-sensitive device that has contacts that open and close to control the operation of the air conditioner?

A

Thermostat

23
Q

What type of automotive air-conditioning compressor changes rotary motion into reciprocating motion, and contains four pistons mounted 90 degrees from each other?

A

Scotch-yoke

24
Q

What is the first step to be followed when performing diagnosis of an air- conditioning system?

A

Know the system and how the parts work together

25
Q

According to the EPA, what refrigerant can now be used to replace R-12 refrigerant in air-conditioning systems?

A

R-134a

26
Q

(True or False) When servicing HVA/R units, certification is not required for using or removing refrigerants.

A

False

27
Q

What type of standard air-conditioning certification must a technician have to service or dispose of low-pressure appliances?

A

Type III

28
Q

(True or False) Conditioned air ducts bring outside air into the air-conditioning system, then distributes it to the conditioned area.

A

True

29
Q

What air-conditioning duct is the most efficient?

A

Round

30
Q 
Which of the following duct components controls the distance, height, and spread of air-throw, as well as the amount of air, but can also cause some resistance to airflow?
A. Diffuser
B. Register
C. Grille
D. Damper
A

C. Grilles

31
Q

(True or False) Automatic fire dampers that are installed in vertical ducts must be inspected at least once a year to ensure they are working properly.

A

True

32
Q

What type of air conditioner fan is also known as a squirrel cage fan?

A

Radial flow

33
Q

What is the fourth step that a technician should follow when balancing the system?

A

Measure the “free” grille area.

1. UT Basic/ Advanced (25 decks)

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