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HVAC FC 07

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HVAC FC 07
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20 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What percentage of a refrigeration load can be placed on an evaporator regulated by a two temperature valve?

0.2
0.3
0.4
0.5

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

According to the OSHA safety and health regulation for construction, a fatal accident that results in a death must be reported no later than ___.

1 hour
4 hours
8 hours
24 hours

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When computing heat leakage for a building, the U-value for most types of construction can be obtained from reference books. The unit of measure for U-value is expressed in ___.

Btu/sq-ft/deg.F/Hr
CFM/Hr
heat-flow / square-area
heat-flow / temperature-difference / area

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Carbon dioxide stack changes with respect to the amount of excess air (oxygen) in the area. Systems will vary in the CO2 content operating between 8% to 12%. If a system uses a oil-fired heating system, what would be the CO2 content of flue gas, given that the excess air in the system was approximately 80%?

0.12
0.1
0.09
0.07

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Volatile liquid is located in the ___ and this is in contact with the evaporator of the refrigeration system.

Bi-metal
Solid state
Cap tube
Sensing bulb

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Slowing the velocity of water through an evaporator will have what effect on the heat transfer?

increase
decrease
no change
slightly improve

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many CFM of ventilation air is required for a 50,000 Btu/hr infrared heater?

100
200
300
400

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