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HVAC Exam 1 Questions And Answers With Verified Solutions Already Passed!!!
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HVAC Exam 1 Questions And Answers With Verified Solutions Already Passed!!!
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HVAC Exam 1 Questions And AnswersWith Verified Solutions Already
Passed!!!
Matter exists in what three forms? - ANSWER✔✔solid, liquid, gas
What is temperature measured by? Quantity or intensity - ANSWER✔✔Intensity
Define British thermal unit (Btu) - 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 -
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? - ANSWER✔✔
1 Btu raises air - ANSWER✔✔4.75F
To melt 1lb of ice you need - ANSWER✔✔144 Btu
So to melt 2000 lbs of ice or 1 ton you need - ANSWER✔✔288,000 Btu
What is 1 ton of refrigeration? - ANSWER✔✔288,000 Btu / 24 hrs = 12,000
Btu/Hr
, What is the hottest water can get? - ANSWER✔✔212F
1 Btu raises 1 lb of water - ANSWER✔✔1 degree F
If 750 Btu is supplied to 15 lb. of water at 72F, what will be the resulting
temperature? - ANSWER✔✔750/15=50F
50F + 72F = 122F
Latent heat cannot be measured on a thermometer. True or false? -
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. - ANSWER✔✔Q= 1.08*CFM*Change in Temp
CFM cubic feet/min
make sure it is given to you in CFM or convert it from seconds to min or hours to
min
The heat that changes the temperature of a substance is called -
ANSWER✔✔Sensible heat
The heat that changes the state of a substance is called - ANSWER✔✔Latent heat
The heat that changes a liquid to a vapor is called the heat of -
ANSWER✔✔Vaporization
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