Which of the following is used to determin the size of a room - Answer- Window frames
To find volume of a cylinder it is necessary to - Answer- Find the volume of the circle forming base
for which of the folling is area used - Answer- surfaces
In order to determine hear flow one must know ...
HVAC EXAM 2 QUESTIONS AND ANSWERS
Which of the following is used to determin the size of a room - Answer- Window frames
To find volume of a cylinder it is necessary to - Answer- Find the volume of the circle forming base
for which of the folling is area used - Answer- surfaces
In order to determine hear flow one must know the amount of time and - Answer- BTU
Units that connot be measured in base units and require more than one measurement are called - Answer- Derived units
Cubic yards are typically used to measure - Answer- Large volumes of dirt
The space/volume in a room is measured by - Answer- Cubic Feet
Which of the following is a characteristic of water vapor but not other water in states - Answer- Water is compressible
how does the law of conservation state that matter never changes - Answer- Matter never changes quantity
How would the laq of conservaton of matter explain what happends to a cup of water when it evaporates - Answer- The liquid water is now water vapor of the same quantity
Which basic principle is one that influences how all HVACR systems work? - Answer- An increase in pressure can increase the boiling point of a liquid the temp at which a luquid turns to a gas.
As an air-Conditioning and refrigeration tech, which of the following stats of matter will you use in your job - Answer- Solid, liquid, and gas
Which of the following is accurate about gases - Answer- A gas must be contained in a closed container or it will escape into the atmosphere
The point at which water or another substance may exist simultaneouslty as a solid liquid and gas is - Answer- Triple point
When a liquid vapor mix is heated in a closed space eventually the density of the liquid decreases and density of the gas incresas when no difference exists between the liquid and bapor exists it has reached its - Answer- Critical point
A person rideing in car flies forward when the car comes to a sudden stop what concept
does this illustrate? - Answer- Inertia Which of the following is true with items with larger mass - Answer- Objectswith a larger mass have more inertia than objects with less mass
How do industry organizations make it easier to compare testing results for HVACR tech - Answer- Industry organizations determine a set of standard conditions that make all HVACR testing results
How do environmental variable complicate HVACR testing - Answer- Testing Conditions
such as air pressure an temp can affect testing
In a HVACR tech determines the ration fo the density of a material to the density of a common material what is she calculating - Answer- Specific Gravity
Natural gas will float on air what does this tell us about its properties? - Answer- It has a
lowe specific gravity thain air
Which is occurring when gaseous molecules release heat and join together to form a liquid. - Answer- Condensing
How does pressure affect boiling point - Answer- The bolining point is directly proportional to the amount of pressure
Why is the voltage of electricity changed for transmission over long distances - Answer- It reduces the amount of electricity loss
Why is the figure 3.41 significant in figuring BTU - Answer- One watt produces 3.41 BTU per hour
A ball rolls down an incoine in 5 seconds which illustrates the concept of work - Answer-
The Rolling ball
When an electron moves from one atom to another it causes a chain reaction what is the result of the reaction - Answer- electrical energy
If someone works with electricity what measurements may be used - Answer- Coulombs
and watts
Which of the folling is true about the relationship beween potential and kinetic energy - Answer- Kinetic and Potential energy my be converted in either direction
Three forms of energy used in heating and air conditioning includee - Answer- Electrical
magnetic mechanical
what units are most commonly used to measure heat quantity in the USA - Answer- BTU
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