WorksheetsBasic Concepts of Energy and Temperature
Total questions: 20
Worksheet time: 10mins
What is the purpose of a refrigeration system?
To increase the temperature of a space
To transfer heat from one location to another
To convert solid to gas
To measure energy consumption
What are the base units of the US Customary measurement system for distance and mass?
Meter and gram
Foot and pound
Inch and kilogram
Yard and ounce
What is the relationship between specific volume and density?
Specific volume is directly proportional to density.
Specific volume is the inverse of density.
Specific volume and density are unrelated.
Specific volume is equal to density.
What is the specific gravity of water?
Less than one
Greater than one
Equal to one
Zero
What is the conversion factor from pounds force to newtons?
1 lbₓ = 9.8 N
1 lbₓ = 4.45 N
1 lbₓ = 2.2 N
1 lbₓ = 1 N
How many foot-pounds per second are equivalent to one horsepower?
500 ft-lb/s
550 ft-lb/s
600 ft-lb/s
650 ft-lb/s
What is the power required to lift a mass of 100 kilograms at the rate of 10 meters per second?
9.8 kW
5.5 kW
7.2 kW
8.3 kW
What happens to atoms as the temperature of a substance increases?
Atoms move more slowly.
Atoms stop moving.
Atoms move more rapidly.
Atoms become larger.
How many spaces or degrees are there between the freezing and boiling points of water on the Celsius scale?
180
100
212
32
What happens to most substances when heat is added?
They contract
They expand
They remain unchanged
They become solid
Which temperature scale uses the same increments as the Celsius scale?
Kelvin
Fahrenheit
Rankine
Newton
What is the boiling temperature of water in Rankine?
672°R
492°R
212°R
373°R
What is the specific heat capacity of water in Btu/lb°F?
0.327
1.000
4.187
1.055
What is the specific heat capacity of wood in kJ/kg°C?
0.327
1.367
4.187
1.000
What is the specific heat capacity of 20% salt brine in SI units?
3.559 kJ/kg°C
4.187 kJ/kg°C
1.0 kJ/kg°C
2.5 kJ/kg°C
How does convection transfer heat?
Through molecular vibrations
By heat rays
By the movement of a liquid or gas
By reflecting light
What is a characteristic of a solid state of matter?
It has a definite shape and volume.
It has no definite shape but a definite volume.
It has no definite shape or volume.
It expands to fill its container.
What is the latent heat of fusion?
Heat required to change a gas to a liquid
Heat required to change a solid to a liquid or vice versa
Heat required to change a liquid to a gas
Heat required to change a gas to a solid
What is sensible heat?
Heat that changes the state of a substance
Heat that causes a change in temperature of a substance
Heat that is absorbed without a temperature change
Heat that is released during condensation
Why is the latent heat of fusion not given in the table?
It is not relevant to HVACR technicians
Refrigerants do not freeze at common temperatures
It is the same for all substances
It is too complex to measure
