問題一覧
1
The temperature at which a liquid will boil is dependant upon the pressure exerted on the surface of the luquid.
True
2
Heat conduct at the same rate in all materials.
False
3
Sensible heat, latent heat and total heat are all different forms of heat.
True
4
Temperature is defined as
the level or intensity of heat
5
In theory molecular motion stops at
0 degrees Rankine
6
A rise in sensible heat causes
a rise in temperature on a thermometer
7
Latent heat causes
a change of state in a substance
8
Which of the following heat transfer methods best describe the principle of convection?
Movement of heat by air or fluid
9
______ heat transfer can be explained aa the energy actually traveling from one molecule to another
Conduction
10
One British Thermal Unit will raise the temperature of ____ LB of water _____ deg F
1 & 1
11
The amount of heat (measurein btu's) that is required to raise the temperature of one pound of substance 1 degree F is referred to as
Specific heat
12
Which of the following btu ratings correctly describes one ton of refrigeration
all of the above
13
Given two objects of the same size, one chrome painted and one painted black, which of the two will absorb more radiant heat?
Black painted object
14
Which of the following units is used to express the quantity of heat in a substance in the metric system?
Kilojoule
15
Heat will flow in what direction
Warm to cold
16
Heat that is given by an infra red heater is an example of which heat transfer method
Radiation
17
When soldering an electrical connection with a soldering iron, the method of heat transfer being utilized is
Conduction
18
Convert -37 dg C to degrees Fahrenheit
-34.6 deg F
19
Convert 45 deg F to deg Celsius
7.2 deg C
20
40 deg Kelvin would equal which of the following
-388 deg F
21
The latent heat of fusion describe a change in state from a
solid to a liquid
22
Dry Ice is actually made from
carbon dioxide
23
The method of heat transfer that is known "Hidden Heat" is really
latent heat
24
The four absolute temperature scales begin at which of the 4 corresponding temperatures
-460 F, -273 C, 0 deg R, 0 K
25
What is the heat content for only the "latent heat of Evaporation" process, if 1 lb of ice at 0 deg F is turned into 1 lb of steam at 212 deg F
970 BTU's
26
Using the formula Q = MC(T2-T1), what amount of heat would need to be removed to cool 120 lb of vegetable oil from 95 deg F to 45 deg F if the specific heat of the oil is .4 btu/lb
2400 btu's
27
What is the heat content required to change 10 lbs of ice at 32 deg F to 10 lbs of water at 32 deg F
1440 BTU
28
Will glass or copper conduct heat the most rapidly
Copper
29
Which of the following has the largest specific heat capacity
Water
30
Conductivity is the
a substances ability to conduct heat
31
The highgest temperature at which a substance may be liquefied regardless of the pressure applied upon it is referred to as
Critical temperature
32
Matter exist in three states and its mass?
never changes
33
Which of the following statement is NOT true?
When heat is added to a substance its temperature always rises
34
The component in a refrigeration system where the refrigerant boils and absorbs heat is referred to as the;
Evaporator
35
Refrigerant fluids are
all of the above
36
In the diagram above which points represent where the latent heag process is taking place?
B to C and D to E
37
What is the new temp. of 50 lbs of water at 180 deg F if the total heat removed is 4000 BTU?
100 F
38
The result of applying a force through a distance is termed as
Work
39
What does the sensing bulb of a thermostatic expansion valve sense
The temperature of the refrigerant at the outlet of the evaporator
40
The temp. difference multiplied by the number of pounds of water will give?
number of BTU