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First test for Refrigeration Introduction.
Terms in this set (48)
The standard atmospheric conditions for water to boil at 212°F are...
atmospheric pressure: 14.696 psi, temperature: 70°F.
At standard conditions on the Celsius scale, water will boil at...
If water weighs 8.34 pounds per gallon, it will take _____ Btu to raise the temperature of 4 gallons of water from 70°F to 72°F.
T or F
Heat flows from a warmer substance to a cooler substance.
When heat transfers by conduction, it...
moves from molecule to molecule
When heat transfers by convection, it...
is transported from one place to another by air of liquid.
When heat transfers by radiation, it...
moves through space and air and heats solid objects.
Sensible heat energy levels...
can be measured with a thermometer.
Latent heat energy levels...
cannot be measured with a thermometer
The atmosphere will support a column of mercury _____ inches at sea level.
A Bourdon tube is often found in a...
pounds per square inch of gauge pressure minus atmospheric pressure.
98°C converted to degrees Fahrenheit equals...
70°F converted to degrees Celsius equals...
200°F converted to degrees Celsius equals...
28°C converted to degrees Fahrenheit equals...
A compound gauge measures pressures...
above and below atmospheric pressure.
When a substance is heated, the molecules...
The latent heat of fusion for a water-to-ice transformation is...
Absolute pressure at sea level under standard conditions is_____ psi.
The density of a substance:
Describes its mass-to-volumen relationship.
How many ft-lb of work is done when a 500-lb condensing unit is lifted to the top of a 60-ft building?
If the specific gravity of cooper is 8.91, it weighs:
Specific volume is used to:
Indicate the volume that a specific weight of gas will occupy
Gas molecules push outward in:
All of the above
An example of a fossil fuel is:
Work is equal to:
force x distance
When water boils at 212 it is absorbing only sensible heat or only latent.
Understand weather water at 0 f has heat energy or molecular activity.
Know if temperature difference has an effect on heat transfer rate.
Know what determines the heat transfer rate between substances.
Conduction, convection and radiation
Understand what the laws of thermodynamics can help you understand.
Know if sensible and latent heat can be determined with a thermometer.
Know what two things water at 60 f must absorb to boil.
Sensible and latent heat
Know what temperature water boil on the fahrenheit
Know standard atmospheric pressure
Know celsius and fahrenheit formulas
(0 c• 9/5)+32=32 f
Know how many btu are required to change 116 ice at 20 f to steem 220 f
Know definition of temperature
A word used to describe the level of heat or molecular activity expressed in F,R,C and K
Understand where to find the bourbon tube
Know definition of specific heat
The amount of heat required to raise the temperature of 1 lb of a substance 1 f
Know temperature on celcius scale at which water boil
Know temperature on celcius y fahrenheit scale at which there is no molecular activity
273.15 c and 459.67 f
Know what PSIG represents
Pounds per square inch of gauge pressure minus atmospheric pressure
Understand what happens to molecules in a material temperature increases
Know how many BTU must be removed from 1bs water at 200 f to end up as ice at 30 f
Know how many BTUs required to change 5 lb of ice at 20 f to steam at 220 f
Know how to match the pressure equivalent psig and psia using 15 as the conversion between the two
Psig= psia -1atm (15)
Psia = psig + 1atm(15)
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