HVAC Exam 1 Questions With Correct
Answers
Matter exists in what three forms? - CORRECT ANSWER✔✔-solid, liquid,
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gas
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What is temperature measured by? Quantity or intensity - CORRECT
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ANSWER✔✔-Intensity
Define British thermal unit (Btu) - CORRECT ANSWER✔✔-Measure of
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heat energy - amount of energy needed to raise 1 lb of water 1 degree F
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How much heat is required to raise the temp of 100 lb or water from
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70F to 120F - CORRECT ANSWER✔✔-Q=1000lb*(1btu / change of temp)
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so 1000*(1/ 50) = 50,000
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If 750 Btu is supplied to 15lb of water at 72F what will be the resulting
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temperature? - CORRECT ANSWER✔✔- | | |
1 Btu raises air - CORRECT ANSWER✔✔-4.75F
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, To melt 1lb of ice you need - CORRECT ANSWER✔✔-144 Btu
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So to melt 2000 lbs of ice or 1 ton you need - CORRECT ANSWER✔✔-
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288,000 Btu |
What is 1 ton of refrigeration? - CORRECT ANSWER✔✔-288,000 Btu / 24
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hrs = 12,000 Btu/Hr
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What is the hottest water can get? - CORRECT ANSWER✔✔-212F
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1 Btu raises 1 lb of water - CORRECT ANSWER✔✔-1 degree F
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If 750 Btu is supplied to 15 lb. of water at 72F, what will be the resulting
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temperature? - CORRECT ANSWER✔✔-750/15=50F | | |
50F + 72F = 122F
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Latent heat cannot be measured on a thermometer. True or false? -
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CORRECT ANSWER✔✔-True - only sensible heat can be recorded- latent
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heat is a change in mass EX) vaporization, condensation, fusion, melting
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How much heat needs to be removed to drop the temperature of 1000
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cfm of air from 70F to 55F. - CORRECT ANSWER✔✔-Q=
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1.08*CFM*Change in Temp | |
Answers
Matter exists in what three forms? - CORRECT ANSWER✔✔-solid, liquid,
| | | | | | | | |
gas
|
What is temperature measured by? Quantity or intensity - CORRECT
| | | | | | | | | |
ANSWER✔✔-Intensity
Define British thermal unit (Btu) - CORRECT ANSWER✔✔-Measure of
| | | | | | | | |
heat energy - amount of energy needed to raise 1 lb of water 1 degree F
| | | | | | | | | | | | | | |
How much heat is required to raise the temp of 100 lb or water from
| | | | | | | | | | | | | | |
70F to 120F - CORRECT ANSWER✔✔-Q=1000lb*(1btu / change of temp)
| | | | | | | | |
so 1000*(1/ 50) = 50,000
| | | |
If 750 Btu is supplied to 15lb of water at 72F what will be the resulting
| | | | | | | | | | | | | | | |
temperature? - CORRECT ANSWER✔✔- | | |
1 Btu raises air - CORRECT ANSWER✔✔-4.75F
| | | | | |
, To melt 1lb of ice you need - CORRECT ANSWER✔✔-144 Btu
| | | | | | | | | |
So to melt 2000 lbs of ice or 1 ton you need - CORRECT ANSWER✔✔-
| | | | | | | | | | | | | |
288,000 Btu |
What is 1 ton of refrigeration? - CORRECT ANSWER✔✔-288,000 Btu / 24
| | | | | | | | | | |
hrs = 12,000 Btu/Hr
| | | |
What is the hottest water can get? - CORRECT ANSWER✔✔-212F
| | | | | | | | |
1 Btu raises 1 lb of water - CORRECT ANSWER✔✔-1 degree F
| | | | | | | | | | |
If 750 Btu is supplied to 15 lb. of water at 72F, what will be the resulting
| | | | | | | | | | | | | | | | |
temperature? - CORRECT ANSWER✔✔-750/15=50F | | |
50F + 72F = 122F
| | | |
Latent heat cannot be measured on a thermometer. True or false? -
| | | | | | | | | | | |
CORRECT ANSWER✔✔-True - only sensible heat can be recorded- latent
| | | | | | | | | |
heat is a change in mass EX) vaporization, condensation, fusion, melting
| | | | | | | | | |
How much heat needs to be removed to drop the temperature of 1000
| | | | | | | | | | | | |
cfm of air from 70F to 55F. - CORRECT ANSWER✔✔-Q=
| | | | | | | | | |
1.08*CFM*Change in Temp | |
